The House That Frank Built

OK sports fans! This moment has been many years in the making. The moment when I, and only I, will bust out the structure of our house with the intention of EXPANDING our living space and making a fantastic en-suite (master bedroom-master bathroom) in a manner that puts HGTV to shame! Because this is a big task, and I needed to focus all of my spare time on it, I haven’t made a blog entry for a while. It’s either work on the house and generate material for the blog, or write the blog and make stuff up. I prefer the former. I took 2 weeks of vacation to accomplish this bodacious task, and I got most of the way through. At least I put up the walls and the roof trusses. But it took another 4 weeks of my spare time to finish the roof structure, put the trim on, and finally cover the roof.

Phase 1: Demolition.

As with most building projects, the first part is the demolition. I know I’ve been talking about demolition a lot, so I won’t bore you with too much more of it. As with most demolition projects, the best course of action is to work from the top down, and to disassemble whatever you’re demolishing in the opposite order that it was built. Because the bedroom extension will also result in extending the roof (sleeping under the stars is OK if you’re camping), I began by stripping the shingles from a portion of the roof. My biggest concern was roof safety. If there is anything dangerous in this endeavour, this is it. So I took some time to get the proper equipment: roof jacks, scaffolding, and a safety line with a harness. Yes, it cost a few bucks, but it’s cheap insurance. As I have mentioned in previous posts, I’m a bit obsessed with safety. The other nifty tool that I got was a roofing shovel. This tool has a notched spade that you ram underneath the shingles to get under the roofing nails, and a fulcrum that allows you to pop the nails right out. The technique is to start at the top of the roof, and after you pry off the ridge shingles, you get a start on the shingles at the top and then just go to town. That being said, even with the right tools and safety equipment, it’s hard, tedious, and somewhat messy work.

Safety harness and safety line. It's kind of a PITA to work with, but it sure provided me peace of mind. This is what all the pros use now.

Safety harness and safety line. It’s kind of a PITA to work with, but it sure provided me peace of mind. This is what all the pros use now.

Roof safety: Roof jacks to provide a solid base for working.

Roof safety: Roof jacks to provide a solid base for working.

Roof stripping complete. Took me all day.

Roof stripping complete. Took me all day.

 

Next was the trim. One might think that removing trim is no big deal. But it was to me because I had to get way up high and had to bang and lever stuff around, keep my balance while precariously perched on the scaffolding and ladder, all the while making sure that whatever fell down didn’t fall on me. The other bad news was that we were experiencing a record heat wave, so that meant that every push and pull was accompanied by beads of sweat in my eyes, lack of energy, and dehydration. I kept trying to drink as much water as I could, but there’s really no way to keep adequately hydrated while doing heavy physical labor in 96 degree heat.

Roof overhang and trim removed.

Roof overhang and trim removed.

Now, on to the messy part: Knocking down the walls. This part of the demolition worried me a bit. I didn’t want to spend a lot of time cutting stucco vertically on the wall, but I needed to get the wall down in pieces that were not so big they would damage the subfloor when they would inevitably come crashing down. I first had to knock down the gable wall, first by taking down the triangular portion of the gable by splitting it at the top plate, and then taking down the vertical walls. Since the side walls are load bearing, I had to build a temporary structure to accept the load. Also, I only took down one of the side walls at a time so only one side of the roof was unsupported. Because I didn’t want to have to cut stucco while precariously balanced on a ladder from the outside, I decided to pull the wall down from the inside. Since I know that the easiest way to cut the stucco is when the stucco is lying flat, I decided to yank the whole wall down and then disassemble it. Sure enough, with all of that weight of the stucco, it came down with a big crash! This turned out to be a very bad thing because I, like a dummy, did not think to put temporary bracing under the joists of the bedroom floor. Here is the result:

Gable wall demo complete. What have I gotten myself into?

Gable wall demo complete. What have I gotten myself into?

Temporary bracing to transfer the roof load to the floor. Too bad I didn't complete the job by constructing concurrent bracing to properly transfer the load from the underlying joists to the slab foundation below.

Temporary bracing to transfer the roof load to the floor. Too bad I didn’t complete the job by constructing concurrent bracing to properly transfer the load from the underlying joists to the slab foundation below.

Wall before demo.

Wall before demo.

Wall after demo.

Wall after demo.

Minor damage from the downfall of stucco. I had a surprise coming.

Minor damage from the downfall of stucco. I had a surprise coming.

Joist failure as a result of not properly transferring the load to the foundation. I'm going to put a bag over my head when I call my engineer for recommendations.

Joist failure as a result of not properly transferring the load to the foundation. I’m going to put a bag over my head when I call my engineer for recommendations.

Cracked joists. I needed to deal with termite damage anyway, so really no extra work. But I sure feel dumb!

Cracked joists. I needed to deal with termite damage anyway, so really no extra work. But I sure feel dumb!

Phase 2: Build the walls.

One of the tricky things about building on a second floor is that you actually have to get the building materials UP to the second floor. This meant spending the better part of a day tediously pushing lumber, mostly one piece at a time, up a ladder and onto the second floor. I had to plan ahead to make sure that I had all of the lumber for the entire build, including the interior framing and plywood, because I did NOT want to struggle hauling this stuff up the indoor stairs after I closed in.

Lumber delivered. Now, to get it up to the 2nd floor!

Lumber delivered. Now, to get it up to the 2nd floor!

Building a standard wall for a house is pretty straightforward. You layout and cut the lumber, build and sheath the wall while flat on the floor, and then raise it up. The easiest way is to start by carefully aligning your sole and top plates, and then doing the layout of the studs all at once. This not only saves time, but more importantly, helps to make the wall square because all of the top and bottom measurements are the same. The next thing to do is to make a “kit” for all of the framing lumber. This not only includes all of the studs, but also the headers, sills, cripple, and jack studs for the window and door openings, as well as the framing for each corner. From there, it’s a simple matter of separating the sole and top plates, scattering in the pre-cut parts, and then methodically nailing them together. It’s important to follow a nailing schedule, meaning that the prescriptive codes require specific sizes and spacing of nails for a given assembly. For example, a stud to sole plate or top plate can be two 16d nails driven longitudinally into the stud (“face nail”) or three 10d nails driven in from an angle (“toe nail”). Fortunately, the County of San Diego has a convenient summary sheet of all of these requirements, which the plans inspector “suggested” that I include as part of my building plans. I took the hint.

Wall lumber cut to length and organized to form a "kit". I did this for the lumber for all three walls.

Wall lumber cut to length and organized to form a “kit”. I did this for the lumber for all three walls.

All kit parts need to be labeled so you don't get confused. These are labeled "C/O" for "cripple" stud (window), and "outside" because the top is cut at a 5º angle to allow for water drainage from the sill.

All kit parts need to be labeled so you don’t get confused. These are labeled “C/O” for “cripple” stud (window), and “outside” because the top is cut at a 5º angle to allow for water drainage from the sill.

The next thing to do is to sheath the wall. In many building situations, it’s better to put the wall sheathing on after the walls are raised because you can do some adjustments for dialing in plumb and square, and you can apply the sheathing in a fashion that overlaps the structural assemblies to add some strength. However, it’s more difficult to fool around with large pieces of sheathing, particularly plywood, when you’re trying to hang it vertically. Putting the plywood on the walls while they were still on the floor was a no-brainer for me as a one-man-show. One thing I learned about walls is that 2×4 lumber can be pretty flexible on this scale. You have to use a big sledge hammer to bang stuff around, but it’s important to square things up before you put the plywood on, because once the plywood is attached, it ain’t movin’!

Lastly the wall needs to be raised. There are lots of pictures of construction crews all gathering around a wall, and with a mighty “heave ho”, the wall comes up. Not possible with just me doing the heaving. Fortunately, there is an outfit (Qualcraft) that makes something called a wall jack. This operates much like the old-fashioned car jack that you used to hook under your bumper to change a tire. But instead of a metal jack shaft with teeth, it uses a long 2×4 piece of lumber. It’s pretty ingenious, and here is a short video and some pictures:

Wall jacks in position, ready for action!

Wall jacks in position, ready for action!

Close-up of wall jack. 2x4 screwed into the floor prevents kick-out.

Close-up of wall jack. 2×4 screwed into the floor prevents kick-out.

 

Last wall up, ready for trusses.

Last wall up, ready for trusses.

Phase 3: Place the trusses.

Now that the walls were up, it was time to get some help. The trusses, by themselves, are not particularly heavy, but they are difficult to handle and are fragile if they are handled while they are flat. Fortunately, the same co-workers that helped me place the big beam I needed for my garage portal were willing to spend a morning yanking these bad boys up and securing them into position. I only had 4 of these, but we had a little trial and error at first, so it took a little longer. I also had them come back to help me with the gable wall. Now, it was up to me to finish detailing the front of the roof line with outlookers and blocking.

Last wall up. Things are beginning to take shape.

Last wall up. Things are beginning to take shape.

Trusses delivered.

Trusses delivered, ready for installation.

My "crew". Their help was indispensable in completing this phase of the project.

My “crew”. Their help was indispensable in completing this phase of the project.

Trusses are up!

Trusses are up!

Gable wall and outlookers in place.

Gable wall and outlookers in place.

Phase 4: Finish the roof.

Finishing the roof was actually a two step process. I first needed to get the trim boards placed on the ends of the truss overhangs and outlookers. These are called “barge” rafters, and these were particularly long and heavy. I spent an entire day messing around with scaffolding and engineering a “third hand” to hold the rafter while I put it in place. But when I found it impossible to even the the board up there by myself, I knew it was time to call my crew back for another session. Sure enough, in about 3 hours, we were all done. Finally, I was able to get the roof sheathing in place. If this were a flat surface, this job should have taken about 3 hours. But because it was on a roof, I had to laboriously move around and reconfigure scaffolding, haul materials up and install them, and then move onto the next part. Getting the plywood up for the roof sheathing was also challenging. I decided to make a simple lifting fixture from scrap 2x4s that I screwed onto the plywood, and then used a rope to pull up the plywood. I also set up a couple of long boards to help the plywood slide up to the roof. This lifting fixture also proved valuable in placing the plywood because it gave me some leverage. Note that I had to place on piece of plywood at a time using this method, so, again it took a long time.

Another thing I learned about working on a roof is that it’s physically hard! That’s because you constantly have to fight against gravity because you’re working on a slope. Plus, there’s no shade (duh!). So, in addition to it being hot, all of that up-and-down and muscling the plywood in place really wore me out. In the end it took about a week (!) to finish the roof. But I liked the result.

Outlookers in place, ready for the barge rafters. Note the "3rd hands" to the right and left of the scaffolding on the outlookers.

Outlookers in place, ready for the barge rafters. Note the “3rd hands” to the right and left of the scaffolding on the outlookers.

Barge rafters in place. Beginning to look like a house!

Barge rafters in place. Beginning to look like a house!

Shiplap appearance boards are on the roof overhangs to match the rest of the house.

Shiplap appearance boards are on the roof overhangs to match the rest of the house.

Roof all done! Looks nice.

Roof all done! Looks nice.

The inside. This is going to be a nice bedroom!

The inside. This is going to be a nice bedroom!

The proud builder and his creation.

The proud builder and his creation.

Phase 5: Install the connectors.

Actually, installing the connectors is something that I did as I went, but I wanted to highlight the fact that the days are gone when you can simply use nails to build a house. Modern house construction uses metal connectors almost everywhere, especially between major components (e.g., foundation to first floor, first floor to second floor, second floor to roof). There are hundreds of connectors to choose from, but that was taken care of during the design phase, so the ones that I’m using are all in my plans. Each connector has a specific fastening schedule (number and type of fasteners), so you have to be pretty meticulous. I made copies of the specification sheets for each connector that I used, and highlighted each one and keep them in my permit book so that when the inspector comes by, I can show him what I’m working to. I really did learn something when I prepared for my inspections in the Navy!

Metal connectors for the roof, studs, and top plate.

Metal connectors for the roof, studs, and top plate.

Connectors between gable and front wall. I still need to add connectors between the wall and the rim joist on the bottom.

Connectors between gable and front wall. I still need to add connectors between the wall and the rim joist on the bottom.

I’m hoping the pace will now pick up with the roof, windows, stucco, and HVAC contractors coming in. Stay tuned!

 

Upon This Rock I Will Build My House

With demolition largely complete, it’s time to start building! Well, not quite so fast. Demolition being “largely complete” simply means that I’ve done as much as I could without actually opening up the house. This is an important distinction because once you open up the house, you have to work like hell to build it back up so that the varmints stay outside. Especially the ones who are walking by and see your expensive tools and want to take them.

My new pneumatic nail gun. The new tool for this project. I know, a REAL framing carpenter only uses a hammer, but nobody does that anymore these days.

My new pneumatic nail gun. The new tool for this project. I know, a REAL framing carpenter only uses a hammer, but nobody does that anymore these days.

At any rate, I was ready to build the portion of the garage that was directly under the new bedroom addition. Originally, I planned to keep the existing structure and simply reinforce it and put plywood panels on the outside to make new shear walls, and build a new deck overhead. But, alas, when I removed the drywall, I found that the framing around the garage door, commonly referred to as a “portal”, was not even close to the required specifications. So, I had to take down all the walls and start from scratch, building up from the foundation. It was probably just as well because the existing framing, although adequate, was lacking somewhat in craftsmanship and accuracy. Best to get a fresh start. But I had one “big” problem.

One of the hallmarks of this project is that I’m doing EVERYTHING myself. So, I typically have to give some thought about how I will handle materials without help. In most cases, I can rig up a “third hand” or find a way to wrestle this or that into place, and sometimes have to come up with a mechanical solution (e.g., ropes, pulleys, chains). In this particular case, I had to figure out how to lift a REALLY BIG BEAM into place. I’m talking 3-1/2 inches thick by 16 inches tall by 20 feet long. While contemplating this at work, I mentioned my conundrum to one of my co-workers, who happened to have some extensive remodeling experience himself. He said, “Let’s just get some folks together and muscle this thing into place. It won’t take but a few minutes, if everything goes right, but let’s plan on a few hours because I’m a believer in Mr. Murphy.” He was referring to Murphy’s Law: If anything can go wrong, it probably will. So, with some cajoling, I was able to enlist the help of another co-worker and my oldest son, and arranged for a Friday morning beam raising ceremony. I also got my plumber scheduled so he could re-do the water service entering the house. This was important because I had run the water line through the front and needed to have the line disconnected to get the shear wall in place.

Now the pressure was on! I took 3 days off from work, figuring that I could get the demolition done and the framing up to accept the beam during the first two days, and be all ready by the appointed time on Friday morning.

The front of the house sure looks different with the balcony removed.

The front of the house sure looks different with the balcony removed.

Day one, Wednesday: Let the demolition derby begin! The first thing to do was to remove the old balcony floor. It turned out that the subfloor was attached with screw nails and it was a real bitch to lever off the plywood, and of course, it took much longer than anticipated. I then had to disassemble the joists underneath. I found out that I could knock them sideways and they came right down. Then, I had to remove the stucco from the walls.  This is one dirty, tedious job that requires a lot of muscle work. Never mind that I had to take my 7″ grinder and precariously balance myself on top of a stepladder while getting all that dust in may face. Fortunately, I was smart enough to wear full goggles and a dust mask. Still, the goggles fog up and you end up getting covered with that crappy dust and end up looking like the Pillsbury Dough Boy. Needless to say, this took longer than anticipated (do you see a pattern developing?) and I had to stop before I could finish. Plus I was dead tired. I figured I could make up the time tomorrow. But first, I had to clean up and then install a big piece of black visqueen across the garage opening. I wanted to discourage random thievery and I figured that hiding everything would at least keep my valuable tools out of sight.

The stone that the builder rejected has become the chief stumbling block.

The stone that the builder rejected has become the chief stumbling block.

Day two, Thursday: Despite being exhausted from the day before, I had trouble sleeping because I was cramping up. That’s what happens when you hit your body hard with a bunch of exercise (as I know from my triathlete days). But woke up early because I knew I had to catch up. Went to Home Depot to get some pressure treated lumber for new sill plates because the existing ones looked like hell and I figured now would be the time to replace them. More unanticipated work. I still had one wall to knock down and some additional stucco to remove, but I couldn’t start because my lumber delivery came. It was one big load all strapped together, so the driver just slid it off the truck and onto the driveway. So, I had to move it all around in order to clear the driveway, but it was just as well because I re-stacked it in the order I needed to use it, which would hopefully save some time later. And it was getting later. By the time I had finished the remaining demo, and cleaned up, it was noon. Putting in the new sill plates took some time, but I figured that the wall framing would be pretty easy. I cut all of the lumber to the sizes I needed, but was only able to get one of the walls together and up before it got dark. And I was totally out of gas. Time to get some rest for the big day tomorrow! But first, I had to clean up and put that damned plastic back up.

Day three, Friday: I couldn’t sleep last night either because I knew I had to get that last wall up and I had folks coming at 7:30. Fortunately, I was able to get the wall framing assembled on the ground, and my son showed up to help me wrestle it in place. I was just finishing up when the rest of the crew arrived, and it was time to raise the beam! After a few minutes of strategizing, we all grabbed it and muscled it up there. I tacked it in place, but then Mr. Murphy showed his ugly head. I realized to my horror that I made the end walls 3″ too short! How could that be?? Well, like a dumb-ass I subtracted the double top plate, which I shouldn’t have done. Now we had to take out some nails, which was pretty damned difficult, and raise the beam enough to slip in a couple of 2×4’s underneath to get everything level. Unfortunately, we had to do this one side at a time, which meant that there were some small gaps at the ends because lifting up the beam on one end, even by 3″ threw it slightly out of level. In the end, I was only about 1/2″ off, but still you could see some gaps. Ultimately, gravity will settle things somewhat, but it was a little disappointing. Nevertheless, my plumber came and did his typically excellent installation, so I was able to get up most of the shear panels and ended the day with something that looked like a proper structure. After clean up and putting the plastic up (again) I could go in with a sense of satisfaction.

Day four, Saturday: Once again, I was working by myself. I got the rest of the shear panels up and then had to install some additional framing around the garage door opening so that I could re-install the garage door. I didn’t want to keep putting plastic sheeting up, plus I sure didn’t want to leave the house wide open when I went back to work on Monday. This took longer than expected because I decided to put some additional framing in to more easily locate the seismic hold-downs. I then had to attach a 20′ 2×12 to an existing beam that would support the joists of the bedroom addition floor. When I did the plans, I figured that what was existing (a built up beam of 3-2x12s) was good enough, but the plans examiner INSISTED that I put in another 2×12 and secure the whole assembly with a bunch of 1/2″ carriage bolts. At the time, I though it was overkill, but as I tried to marry up the new 2×12 to the existing structure, lo and behold, the existing beam was sagging. I mean by a very noticeable amount, like over an inch! So, I guess the plans examiner was right all along, and I now thank him for his advice. I wasted an hour trying to jack the existing beam up with what I had, but the more I thought about it, I figured the only way to straighten the whole thing out would be to replace it — a non-starter. So I did what a lot of remodelers end up doing, which is living with what you have and adapting. There will be a discontinuity when the new floor meets the old floor, especially in the center, but I’ll deal with that later. I also had to waste another hour or so cutting out the bottom of the aluminum framing around the sliding glass door.  The new lumber was hitting it and wouldn’t go flush to the existing built-up beam. As usual, time flew and by the end of the day, I only ended up getting the new 2×12 tacked up and in place. Still had to install all of those bolts.

New joist all bolted into place. See the gap between the bottom of the new joist and the bottom of the existing beam?

New joist all bolted into place. See the gap between the bottom of the new joist and the bottom of the existing beam?

Day five, Sunday: I really wanted this to be a day of rest, but I spent several hours after church re-installing the garage door. It was a little fussy, but I got it in and working. This was good because now the garage had some physical security and I felt OK locking it up and leaving it. All the tools were out of sight, and it would take some doing to climb up and around to get into the place. So much for the “big week”. At least I got stuff closed in a bit, which removed some of the pressure to meet deadlines. After all, this is supposed to be enjoyable, eh?

The garage door re-installed and my tools safe from random thievery.

The garage door re-installed and my tools safe from random thievery.

Here is a video of the whole thing:

Now my attention turned to installing hardware. Besides the bolts for the new 2×12, and joist hangers and hold-downs for the new joists, I had to figure out where to drill holes in the foundation to install threaded rods glued in with a special epoxy to meet new code requirements for seismic loads. I had a pretty good idea where most of them should go, but there was a tricky spot in the corners next to the garage door opening. Additionally, the special epoxy installation needed a “special” inspection, meaning that an inspector certified in this sort of thing had to inspect every hole for proper depth and cleanliness before you put the epoxy goop in. So I figured I would ask the inspector about the bolt location AHEAD OF TIME. Note my predilection for avoiding future trouble caused by me.

Proposed hole locations. I really didn't know how to do this correctly. At least I realized this ahead of time.

Proposed hole locations. I really didn’t know how to do this correctly. At least I realized this ahead of time.

I looked up special inspectors on Angie’s List, and while Angie’s List is usually pretty good, here I found nothing. So I searched on the Internet and found a guy whom I contacted. He was very cooperative, and since I did the design, I knew the requirements so I was able to give the impression that I knew what I was doing. I sent him a picture of the proposed hole locations, and he contacted a colleague who happened to be a registered Professional Engineer (PE) to get his advice. After some back-and-forth, I contacted the PE, whose name is Chris Pinnow (see link to his website) and arranged for a meeting. As the appointed time came closer, he was running late and suggested that he would come the following day (Saturday) AND he would bring a hammer drill and bit and offered to help drill the holes and knock off the entire job! It was pretty easy to say yes.

"My" engineer- Chris Pinnow. Really glad to have met this guy.

“My” engineer- Chris Pinnow. Really glad to have met this guy.

Sure enough, he shows up and we get to work, and in 4 hours I have all the holes I need, properly inspected with threaded rods properly secured with that special epoxy. Turns out that I had some misconceptions about what the hold downs were supposed to accomplish, and I’m really glad that Chris came and checked things out, because he made some crucial corrections to the installation. Here is the lesson: The days of framing a house with a stack of 2x4s, circular saw, and a big box of nails, are over. Today’s construction techniques are pretty sophisticated and if you’re doing something on the order of a remodeling job that involves structures, you’d better find a PE that can help you look at a few things should they come up. Their prices are usually very reasonable for professional services, and their advice is well worth it because you won’t have to do things over.

Final location of the holes, per my engineer.

Final location of the holes, per my engineer.

New hold down bolts all glued in place.

New hold down bolts all glued in place.

With that out of the way, it was time to build the deck over the garage, which serves as the structure for the floor of the bedroom addition. Ordinarily, this would be a relatively straightforward task, and if you were building totally new construction, it’s a day’s job, even if you’re solo. But with remodeling, usually nothing is so straightforward. That’s because the old stuff has most likely moved around a little bit due to settling. Plus, sometimes the carpenters who build the house may not be so fussy about accuracy, especially if they’re building a tract house and time is of the essence. So, things are not necessarily plumb or square, and you have to accommodate this when you meet up the new with the old. In my case, the built-up beam that supports the existing bedroom gable wall was not only sagging, as mentioned above, but was also bowed out and canted forward. That meant that I had to not only cut each joist to a different length to accommodate the bow, but also cut each at an angle so they would meet up correctly with the canted face. But, hey, it gives me a chance to exercise my craftsmanship skills.

Old meets new. Note the sag in the existing beam as compared to the new joist. Also note the location of the chalk line.

Old meets new. Note the sag in the existing beam as compared to the new joist. Also note the location of the chalk line.

Notice the difference in the position of the chalk line. This shows the bow in the existing beam.

Notice the difference in the position of the chalk line. This shows the bow in the existing beam.

My worksheet to keep track of what joist goes where.

My worksheet to keep track of what joist goes where.

I had to cut each joist at an angle to take into account the cant of the existing beam.

I had to cut each joist at an angle to take into account the cant of the existing beam.

All joists are up. Still have to add the rim joists.

All joists are up. Still have to add the rim joists.

Deck framing complete with rim joists installed.

Deck framing complete with rim joists installed.

Blocking detail. These are short blocks of wood that fit in between the joists. This not only gives the structure a lot of additional strength, but also squares up the joists nicely. Note the tight fit in the corners. Really looks nice!

Blocking detail. These are short blocks of wood that fit in between the joists. This not only gives the structure a lot of additional strength, but also squares up the joists nicely. Note the tight fit in the corners. Really looks nice!

Now with the framing in place, it was a simple matter to install the plywood on the frame to make a nice solid deck for the bedroom floor. I was a little concerned about fitting together the tongue-and-groove plywood together by myself, but I came up with a nifty way to do it. All you have to do is to get one corner started and then temporarily secure it with a deck screw to the joist below. Then you can coax the whole assembly together using the deck screw as a pivot. Here is a picture:

How to mate tongue and groove plywood by yourself.

How to mate tongue and groove plywood by yourself.

With the deck in place, it was time for an inspection. This was important because if I don’t have an inspection every 6 months, the city assumes that my project has been abandoned and they cancel my building permit. Because I can only work so fast, and I didn’t have a lot of inspectable items while I was working on the outside, AND I used up my one-time extension, this was a big deal. The inspector came and had some good words of advice, particularly when he pointed out that I had installed the washers on the hold-downs upside-down. How embarrassing!!

New hold down ready for inspection. Note the position of the U-shaped washer under the nut. I had a little surprise coming.

New hold down ready for inspection. Note the position of the U-shaped washer under the nut. I had a little surprise coming.

Hold down properly installed (!)

Hold down properly installed (!)

Nevertheless,  I got a couple of inspections signed off, so I punched my card for 6 more months. This whetted my appetite for the BIG buildout of the master bedroom, which is next!

New deck installed.

New deck installed.

The proud builder atop his masterpiece.

The proud builder atop his masterpiece.

Detailed Design — How To Design A Structure

After the architectural design was complete, the next step was to actually figure out how to construct it. My plans needed to be detailed enough for the city building department to approve them. At first blush, one might think that pushing out a bedroom by seven feet is no big deal. Throw together a few trusses, use the existing flooring, build some walls with holes in them for windows, and you’re done.

Well, not really. The short story is that building codes have advanced, and when you build an addition, you are actually going to build a carefully engineered structure. If you’re really not a die hard DIY and/or don’t have any background or training in structural engineering or construction, then your best bet is to hire a designer to do the work. They aren’t cheap (I got a quote for $7,500 minimum), but it may be worth it, depending on the complexity of your project. Having said that, you don NOT have to be a structural engineer to design an addition , or any other structure for that matter. All you have to do is follow the prescriptive  methods contained in the applicable codes. This is essentially a “cookbook” method of designing a structure that includes a number of safety factors such that a design using these methods will withstand loads and stresses (people, wind, earthquake, etc.) that are expected for a residential home in a specific location. Here is where you can benefit from my experience. DO NOT try to get all fancy and design something that is not clearly specified in the codes and deviates from the “cookbook recipe”, then you will have to get a sign-off by a licensed Professional Engineer (P.E.). Again, this is expensive, and probably not worth it for a smaller project. So if you’re willing to spend some study time (and maybe even learn something!), a DIY solution awaits!

The best place to start is the building code that is applicable to your jurisdiction. The California Residential Code is actually reasonably easy to follow, but I found the American Wood Council Wood Frame Construction Manual (WFCM) a better resource for my purposes. Since the California Residential Code allows it, that is what I used. What really made a difference and put it all together for me was the WFCM Workbook, which has an example home design that steps you through the process. You will also have to determine the environmental conditions that your structure will need to withstand. This includes maximum wind conditions, seismic design category, whether or not you’re in a flood zone, maximum and minimum temperatures, termite infestation likelihood, and other factors. These are usually spelled out in the code and it makes sense to put together a little table for yourself so that you can refer to it when bouncing back and forth between the various parts of the code to get your numbers.

The approach that I used, which was taken directly from the WFCM workbook, was to start at the top and work my way down from the roof to the foundation. At each step you not only have to specify the materials (trusses, roof underlayment, studs, joists, etc.), but you ALSO need to show how these elements are connected. The code gives a table of fasteners (mainly nails) for fastening framing and sheathing, but when it comes to connecting major assemblies to each other, you typically have to use engineered specialty connectors (for example, roof truss to wall top plate). You have to be able to show, step by step, that the loads from each element are transferred through successive elements all the way to the foundation. So, roof to wall, wall to floor, floor to wall, wall to foundation.

A quick word about fasteners. The common nail is a very nuanced component. There are many types of many materials, and it is IMPORTANT that you use the right nail for the right purpose. The tables in the code tell you what to do, but therein are requirements for not only nail type, but spacing, and orientation, e.g., toe nail vs. face nail. Bigger and more is not necessarily better because you risk splitting the underlying wood member. So follow the instructions! In general, nails are better than screws, especially for framing. This is because they have significantly higher shear strength, and have some ductility which means that they will “give” a bit in a storm or an earthquake whereas screws tend to be brittle. Not that screws are bad. Just don’t use them for framing or shear walls. An exception to this are structural wood screws (SWS). These are larger screws made of heat treated steels that have higher quality control than your run-of-the-mill screw. The manufacturers of these screws have data sheets which detail their application. I used them in some places, a ledger board for example, but in general, I stuck with nails when I could.

One thing that was scary for me at the last was trying to figure out how to retrofit concrete anchors to bring the addition into compliance with seismic requirements. Fortunately, the folks who make these connectors also provide a method of anchoring these connectors with special epoxy into existing concrete. The only “downside” is that I have to have a certified inspector sign off on the installation. Well, maybe not a downside as it really has to be right. Just additional expense.

Although I spent many months getting to this point, and went down a few “rabbit holes”, I can definitely say that the effort was worth it, especially as a DIY’er. The process of designing showed me how to build it with all of the right materials, methods, and references. It’s going to be really pro!

Here is a link to my detailed construction plans.

1370 BFD Detail Views