Last time I posted, Trailer Trash Adventures, I was researching the process of upgrading our old mobile home, without breaking the bank. Well, we took the leap. We started the trailer trash makeover with replacing the old, thin, leaky, noisy, criminally-under-insulated roof. Herewith is an account of… The Roofover.
Yes, we got ‘er done. Thanks to a windfall, we finally got that old “turkey tent” poor excuse for a roof covered with a real roof. The crew of two from Southern Builders showed up last week, WHEN THEY SAID THEY WOULD (a home improvement contractor near-miracle, all by itself). They unloaded, built, cleaned up and left, under five hours later. I was impressed.
The crew worked steadily and with minimal idle conversation, and no smoke breaks, unless I missed them. This obviously wasn’t their first rodeo; they seemed to know what to do and when, and they did it.
The first thing they did was to unload and unpack the materials and tools they would be using. The trailer had materials on it for two or three other jobs. Some of it had to be removed to get to the stuff they would need here, but most of it stayed in place, because somebody was paying attention when they loaded up.
After unloading, one team member checked out the roof, including detailed measurements. The other laid out the material and organized it in the order in which they would need it. The online quote form had already collected all the relevant information about the size, style and contours of the existing roof.
The insulation went on, first. It was reflective-foil-backed, three-inch polystyrene foam. This usually has an R-value (insulating property) of R-4 to R-5 per inch, which means an insulation of R-12 to R-15. The reflective foil bounces radiant heat that penetrates the roofing material to get to the insulation, back into the roofing material, and from there, back into space. Combined with a white roof, the foil intercepts of a lot of high-angle, summer sunshine before the insulation even has to deal with it.
The fact that the panels are large means that there are fewer seams between them, and thus less of an opportunity for heat loss due to infiltration. Since they are held in place by the trim around the edges, and covered by the roofing sheet metal, rather than laid between rafters, the amount of thermal bridging is minimal, as well.
The fascia holds the lower edges of the insulating panels in place all the way around. It is screwed into the existing upper roof plate through the existing siding and trim, right above the half-assed “rain gutter” that came with the trailer.
The foil-backed foam was trimmed closely to fit, with tight seams. Stock pieces of this insulation from a big-box store, in four-by-eight-foot lengths, would have had a lot more seams.
All fasteners were white-coated or plated, self-drilling, sheet metal screws – no nails. I was impressed with the quality of the work as seen in these details:
Once the insulation was in place, the sheet metal went on. The sheet metal panels were cut to run from eave to eave, so all the seams run downhill, and none across. The installers put a crimp in the middle where the panel lays over the ridge. When they lay it in place, the panel bends cleanly at the ridge, and reaches the eave on both sides.
And now, for the payoff! Old, turkey-tent roof, versus new, sleek, insulated, weather tight roof:
Of course, we haven’t had the roof long enough to compare cooling or heating bills, but I have been watching the indoor/outdoor thermometers during the current heat wave, and the house stays about 3 to 5 degrees cooler, even on the brightest, hottest afternoons, and I may be able to turn back the window air conditioners when the wave ends. I am really curious to see the effect of the new roof on the heating load – especially whether we need the electric space heaters as much along with the wood stove, next winter. I don’t expect to feel as much radiant heat loss on my skin under the “cathedral ceiling,” with three inches of foam in the way.
We’ll see, but I’m optimistic.
I think this trailer just got a little less trashy!