If you own a mobile home, skirting is an important part of your home. More than just decorative, skirting protects the underbelly of your home from critters and weather, both of which can cause damage. At the same time, it can provide valuable storage space for things that you don’t use on a daily basis. While not usually insulated, skirting provides some barrier to extreme temperatures, making it so that the home’s insulation can do a better job.
The skirting and its framework does not provide any additional structural strength to the motorhome, which is totally self-supporting. So all its structure needs to do is be strong enough to support the weight of the skirting itself. Keep in mind though, that children will run into it with toys, so it has to be fairly strong and rigid to withstand day-to-day use.
Skirting, sometimes referred to as “underpinning” is actually a regulatory requirement, although not everyone pays attention to that regulation. But if you have purchased a home with a HUD backed loan, you must skirt your mobile home. The basic requirements are:
- Permanent wall enclosing the foundation
- Must be self-supporting
- Must rest on a concrete footing
- Must have access opening
While important, skirting doesn’t come as part of a new mobile home purchase and may not even come with a used one when you buy it. A variety of companies manufacture skirting or skirting kits, but these are expensive, especially the more attractive ones. You can do much better and save yourself a considerable amount of money by making your own. Usually, that means making them out of wood.
Ground Vapor Barriers
Before skirting a mobile home, it is important to install a ground vapor barrier. This is not the same as a “belly wrap,” which is a plastic barrier attached under the floor of the mobile home. The ground vapor barrier is a heavy plastic barrier, which rests directly on the ground, keeping ground moisture from reaching the under-flooring of the mobile home.
Properly installed, a ground vapor barrier will extend six inches out from the dimensions of the mobile home, all the way around. This means that your skirting and the structure to support it, will actually sit on top of the ground vapor barrier. That’s good news, as it can also protect that wood from moisture in the ground.
Even with ground vapor barriers, it is important to provide ventilation in your home’s skirting. The basic rule of thumb is one square foot of vent, for every 150 square feet of the mobile home’s floor space. If you have a ground vapor barrier, you can use less vents, installing one square foot for every 300 square feet of floor space.
Vents should be scattered, and are best placed near the corners of the mobile home. This helps ensure that there is airflow throughout the entire area underneath the mobile home and that there are no dead zones where there is no air movement.
There are a number of different wood products which can be used to make attractive and effective mobile home skirts. Some of the most popular are plywood, OSB (Oriented strand board) and T-111. There are a few important considerations when using any of these materials, as moisture can cause them to warp or become damaged.
The most important consideration is sealing the edges of each panel. This can be done with paint, but it is best to do so with acrylic painter’s caulk. While a somewhat time-consuming process, rubbing painter’s caulk into the grain on the edges provides for a much better and thicker seal, which should last for 25 to 30 years.
You also need to paint both sides of the panels. If only the outside is painted, moisture can attack the inner side, causing the panel to warp. By painting the inside as well, you protect both surfaces from moisture. Any paint can be used for the inside, even interior paints, as it will not be exposed to ultraviolet light. However, you do want a heavy coat, not leaving any thin or dry spots.
Framing Your Skirting
Since we are making the skirting out of sheet wood products, it will be necessary to provide some framing, otherwise there’s a high probability that the skirting will warp and possibly even cup. This framing should be made of 2”x 4” construction lumber. I would recommend using pressure treated 2”x 4”s for the bottom rail, but it is not necessary to use them for the verticals or the top rail.
Since the materials we are talking about using come in four foot by eight foot sheets, it makes sense to make the frame sections eight feet long. You are essentially framing as short wall or “stem wall. It is not necessary to put the studs every 16 inches, but I wouldn’t put them farther than every 24 inches apart, even though some people do. You also don’t need a double top plate, like is normally used for a framed wall.
The individual frame sections should be attached together, attached to the underside of the mobile home’s floor framing and attached to the foundation. You don’t need to go to overkill on nailing, as all the structure has to do is stay rigid for the skirting, not provide any additional structural strength.
You may want to consider adding a layer of Styrofoam insulation underneath your skirting. This is not required and only makes a minimal difference; but as most mobile homes have little insulation under the floor, this layer of insulation will help keep the floors from getting so cold in the wintertime.
Finally, the skin can be cut and installed. I would recommend staggering the skin pieces, rather than aligning the seams with the framework. In this way, the seams for the skin will be halfway down the length of the frame, adding additional structural strength.
Don’t forget to seal all the edges and paint the skirting well, so as to seal it and prevent it from becoming water damaged. A couple of coats with a good acrylic-latex paint will work, but it would be even better if you sealed the skirt with a high-quality sealing primer first.
Alternate Wood Designs
What we’ve talked about so far, is simple skirting, which is nothing more than plywood or other engineered wood panels. You may want to consider some other options, instead of this style.
One is to use strips of wood, like 1”x 4”s to make rails around the perimeter as your skirt, rather than a solid one. This provides a more rustic look, something like a split-rail fence. These strips can be painted or stained, either to match the mobile home or to accentuate the idea of them looking like a fence.
If you really need to save money, you can make something that looks just about like what I just described, by cutting pallets and attaching them together to form a skirt. The combination of slats and open spaces will give the same effect of being a fence.
Lattice board can make a nice skirt as well. However, you don’t want to use lattice board by itself. Rather, cut the pieces of lattice board and frame them with 1”x 4”s to make skirt panels. These can then be attached to your framework. Painting the lattice one color, with the 1”x 4” frames another color can add a nice visual effect.