Insulating The Bedroom Walls

After putting the walls up in the main room we started working on insulating the bedroom walls.


First, we put strings up on the outside of the front bedroom wall to keep the insulation from falling out.

As we wrote in a previous post, the new insulation we chose is Thermafiber SAFB mineral wool. We purchased the mineral wool in 2 inch thickness and 1.5 inch thickness. The original bedroom walls are 1.5 inches thick and we made the walls thicker by another 2 inches for extra insulation. This means that we need two layers of insulation in the bedroom. Wear rubber gloves and a long sleeve shirt when dealing with the mineral wool! They are as irritating to the skin as fiberglass batts. Andrew and I worked as a team - he would measure out each wall section, hand me the measurements, I would measure out the mineral wool sheets, mark it, cut it and hand the cut pieces to him to install. We found that a serrated knife (it doesn't have to be this 1990 infomercial breadknife) works best for cutting the mineral wall batts. Smooth like butter. And I use a piece of scrap wood as a guide.

Here's a picture of Andrew measuring sections of the front bedroom wall. The next photo is the view of the insulation from outside the trailer. You can see the underbelly wrap (black fabric) is holding those pieces of insulation in place since there's no outside wall yet. And the last photo is the view from inside the trailer. The first layer of insulation is in, leaving 2 inches of space for the second layer of insulation. 

Once both layers of insulation were in, we covered that wall with plastic as a vapor barrier. The vapor barrier prevents the humidity inside the bedroom from condensing on the inside of the walls. 

Trying to wrangle this huge sheet of plastic was a pain in the butt! But eventually Andrew and I got it straightened out, pulled tight and then stapled it to the wall beams. Once that was done we cut the extra plastic sheet off. 

Then using brads, we put luan up on the inside of the front bedroom wall and with a router a window hole was cut out.

We realized that the side bedroom window holes can't stay as is (picture on the left). We have to cover up the inner wooden frame (the one that creates the square shape with rounded corners) because the flanges of the actual windows that go into the wall aren't square shaped and aren't wide enough to cover the entire inner wooden frame. So we glued pieces of luan over the inner frame so that any parts of the inner wooden frame that shows after the window is installed will be a smooth, nice luan surface instead of crummy 1" x 2" wood.


These are the wires from the trailer harness that gets plugged into the truck. The wires control trailer lights, brakes and turn signals. Mixed in those wires are also wires for the A/C receptacles that will be in the bathroom nightstands. We laid them out because they will eventually be covered by insulation and luan.

Putting insulation in the rest of the bedroom walls along with the sink area and shower. Then the  plastic sheet for vapor barrier went on.

During this time Jerud had cut out the fridge stand pieces. We are installing a fridge stand because it will hold the fridge in place and it makes the fridge taller so we don't always have to bend down to get things out of it.  In the picture on the left Jerud is creating holes in the platform that the fridge will sit on where the fridge and platform will be screwed into one another.

Meanwhile the world outside got a dusting of snow and the dogs decided to eat it.