This is our last major construction day and boy are we excited. We worked late into the night, but we finished up all the prep you saw in step 2, replaced the rotted support beams, laid the insulation, and then put in the new flooring. There isn't too much I can personally instruct you in here, more like just show you the outcome of our work.
The beams were a pain. If we had a chance to lay the entire floor by scratch the beams could be laid out in a nice even pattern, but for a partial fix we had to make up some of our own rules. To do that we purchased straight braces and L-braces to best secure the 2x2's. L-brackets were used to secure the new beams to the outer 2x2 frame like this:
Laying the insulation is fairly easy. We purchased this kind: http://www.homedepot.com/p/Owens-Corning-R-19-Kraft-Faced-Insulation-Continuous-Roll-15-in-x-39-2-ft-RF40/202585898
It was a good compromise between price and level of insulation. The roll appears thin but expands to the perfect thickness for our floor when it's unrolled. The width of course is too wide but you can just use scissors to cut the insulation to size. Make sure you wear gloves to to protect yourself from the fiberglass pieces, you want to avoid the itch they cause, trust me. Plenty of insulation is better than too little insulation, just remember that, and stuff your floorboards.
Finally, we laid the new subfloor. You can use either a 1/2" or 3/4" OSB plywood depending on the width of your previous floor. We cut it to fit the sections we had removed, so there's about an inch of old flooring around the cabinets that will butt up to the new flooring. Check out the overall finished product below.
Pictures:
New Beams Sub-Floor
New Beams Insulation Sub-Floor
New Beams Insulation Sub-Floor
New Beams Insulation Sub-Floor
New Beams Insulation Sub-Floor
You may also notice that the walls look dingy; it is because they've been sanded to prep them for paint. Sanding doesn't have to go very deep, the surface just needs to be roughed up so the paint will stick. You can see that I've sanded the walls in the pictures with the sub-floor and I've also sanded the bathroom, shown below.
Next we'll cover the painting of the camper in step 4.
