Subfloor and Bottom Plate Complete

Weekend #2 - we were able to finish our initial project. We installed all of the floor insulation, glued and screwed down the subfloor and cut the bottom plate to get ready for framing.

The insulation install went fairly smoothly, but it was a multi-step process and required a bit of math.

Step 1. We installed two 1" thick strips of foam insulation on the outside edges of the trailer. In this compartment the metal flashing on the bottom of the trailer is 6" deep.

Then we installed one layer of 1/2" thick insulation board over those strips of foam insulation on the edges of the trailer (for those keeping track, that is 2.5" of foam in the side compartments) and also in the center of the trailer where it was only 4" deep to the metal flashing on the bottom of the trailer.

Step 2. Then came time for the actual batts of insulation. Each batt is made for a 2x4 wall with studs 16" on center. We decided to go with Rockwool insulation, a mineral wool, for it's added R value and moisture and fire resistance. It cut like a loaf of bread and was easy manipulate into place. Just remember that unlike fiberglass, it does not have a vapor barrier attached. Side note: it is considered a greener alternative to fiberglass insulation. 

Step 3. Next we had to coordinate putting the adhesive on and screwing down the subfloor piece by piece. As mentioned in our previous post, we only had 15 minutes to get the board screwed down from when we started putting down the adhesive. On the bigger boards we pushed right up to the 15 minute mark, but managed the challenge with two people. Pre-drilling all of the holes was critical to getting each board secured within the allotted time.

On Sunday we took it a little easy and did a little pre-work for our big framing weekend. We just cut the bottom plate and the headers over the wheel wells.

Next we frame up, so it will actually start looking like a house! And we are so lucky that a few experienced out-of-towners are coming to lend a hand.

First Weekend Working on The Tiny House

It's official! We've finally started! Last weekend progress was made installing the subfloor. We went out to Abbie's parents Friday evening; stopping at Lowe's on the way (because the Granbury Lowe's didn't have what we needed in stock). Good thing we didn't bring the Fit, because the bundles of insulation were much bigger than we realized! We managed, with the help of some rope, to fit all 4 in and on Abbie's car. Luckily it made it the whole way!

Saturday morning was spent prepping the trailer for the subfloor. This involved:

• Cleaning out the branches and dust;
• Sanding down rust spots and then painting back over them;
• Caulking openings in the metal sheathing on the bottom of the trailer;
• Welding 4 metal plates over holes in the wheel well left open by the manufacturer.

After all of the trailer prep was complete we were able to start cutting the 3/4" OSB tongue & groove subfloor panels to fit on the trailer. We decided that we would cut all of the panels before we glued and screwed them down. This was to make sure everything fit and so we could hopefully get in a groove of cutting the panels.

We picked up where we left off cutting subfloor panels Sunday morning. Other than an impromptu Lowe's trip for the last OSB board, the panels fit together beautifully! Before we pulled the panels up to put the insulation in we elected to pre-drill all the screw holes on all the panels. This will allow us to quickly screw down the panels when we put the adhesive down. This is important because there is a 15 minute drying deadline for the adhesive, and not having to pre-drill holes will make it more likely that we will meet this deadline. As we learned, pre-drilling the holes through the 1/8" steel is time consuming and pretty physically tough. It would have been nearly impossible to complete all of these steps in the 15 minute time frame if we didn't do the pre-drill in advance. Abbie will tell you we drilled a million holes, but hopefully it was less than 500 or else we'll need to go get some more screws.

As the weekend came to a close, we were racing the setting sun to get all of the all of the holes pre-drilled before dark. So we kicked it into overdrive and finished strong. Meaning this coming weekend our Thanksgiving goals are to:

• lay in the insulation, 
• put down the subfloor adhesive, and 
• screw all of the panels in place. 

Then once all that's done it will be on to framing!