"I’ve put in an inquiry to a reputable local spray foam contractor and am waiting to hear if he has some way to spray this roof without his truck and rig on site. If there’s some way to do that, I think it would be the easiest way to…"
"I agree that taped joints would be too obvious. I could make wood moldings to cover the joints. But Rmax makes ‘T’ strips, maybe like the ones you’ve seen, that would look a lot better than taped joints and wouldn’t call…"
"I looked at the literature from R-max and Thermax; trying mainly to figure out if the aluminum facing is more like thick foil or thin sheet metal .If I put these panels on the inside of the existing roof, they’d be completely out of…"
"Responding here to my earlier comment: "Somewhere I recall hearing about roof panels that have a thick foam core encased in metal roofing top and bottom. If something like that were available to me, especially in long pieces that would run all…"
"Just this morning I was trying to track down information on rainwater catchment from spray foam roofing, with little success.
Is it the silicone top layer that makes the difference for rainwater? Or are there other coatings that would work also?
"I wasn't aware of this product; very interesting.
The manufacturer's literature talks about 'exposed interior wall applications' -- but doesn't mention exposed interior ceilings -- is that an issue, for instance as to fire…"
"FYI -- I ran a little test yesterday with three kinds of tape: blue masking tape; shiny black duct tape; and standard black vinyl electrical tape. I applied patches of each, about 2" by 4", on the underside of the ceiling, then compared…"
"Brad Cook wrote: "Your ceiling is white and somewhat reflective on the inside, so your thermometer is probably not accurate."
How could I test this?
If I put a piece of blue masking tape on the ceiling and gave it a little time, would it…"
"I may end up working from inside, a room or two at a time -- but my preference would be to do the entire house at once, which as a practical matter would mean putting a new roof on top of the existing one. This may end up being cost-prohibitive, but…"
"In an earlier response, I noted that we COULD haul drinking water and use the water we collect off the roof for everything else, if a new roof surface couldn’t safely collect drinking water – but that would be a step backwards in…"
"As to the elevations on the cupola – the existing windows up there might survive adding 2" of foam, but not 4"! I never did trim out those windows either inside or outside, and they’re crappy windows anyway, so I’m going…"
"The purlins are 1 3/4" thick. I believe the top chord of the trusses are 10" deep (but possibly only 8").
I had earlier considered filling the spaces between the purlins with foam and covering the foam with panels (metal or wood?),…"
"The cupola windows are the only place there would be a problem if 4" of foam were added above the existing roof. In an earlier response I noted that I would probably have to replace those windows, which isn’t a huge task.
I had looked…"
"The purlins are 1 3/4" thick.
I don’t know about the fire dangers of PIC or other foams. I worry plenty about fire, given the remote location, plus all the heart pine I used to build the house. The house is fully sprinklered but I…"
"Exposed rubber washers would disappear in a hurry! I used a screw assembly with a stainless cup washer that completely covers the rubber washer that compresses against the roof. The purlins are very dense; I’ve had very few of these screws…"
"The existing metal roof probably overhangs the outer edge of the lowest purlin about an inch, maybe a little less.
As to aesthetics, the existing roof looks nice from below, but from its edges and above, it’s merely functional and…"
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Paul Eldrenkamp has more than 30 years experience in construction and specializes in energy efficiency. In this interview Paul discusses ways to standardize deep energy retrofits. He offers tips for executing projects and managing homeowner…