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Originally Posted by notfarnow
Locally, I've seen a couple recent insulation jobs where it was going to be $900 and $2200 to DIY, and the quotes from a pro were $1100 and $2600. Hard to justify the work for a couple hundred bucks difference. YMMV
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Depends on where you by the material. If you buy from Home Cheapo or bLowe's, you'll pay more for the insulation. Find a local supply house to purchase the cellulose at a better rate. I will concede the insulation business is very competitive. On the other hand, the labor from some insulation contractors is pure crap. It's amazing the stupid tricks they will engage to save money. I need to pack up the truck with my commercial insulation blower, tour the country, and add insulation to Pelicanite homes.
Quote:
Originally Posted by masraum
I'd heard that the reflective insulation under the roof can overheat the asphalt, but not the spray on foam, but it could be.
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I've also heard spray foam will reject additional heat to the roof, but the studies (with spray foam and/or radiant barriers) have shown the temperature of the roofing goes up by only a few degrees. That small change hardly offsets the tremendous gains from radiant barriers. Besides, if the roof "overheats," that implies the roof is a radiant barrier. If the roof is a radiant barrier, then how does the radiant heat reach the radiant barrier in the attic? Quite simply, most of the radiant heat reflected by the radiant barrier will be reflected back into the atmosphere. I predict Al Gore will lobby against radiant barriers, because they contribute to global warming.
I urged my cousin to install radiant sheathing on his house (new construction). The framer used radiant-backed sheathing over the house, but used regularly sheathing over the adjacent garage. The framer said working over the garage in the middle of summer was bearable, but over the house, it was much, much worse.