I would like to insulate my garage roof (from the inside!) but there is no ceiling. I do various mechanical projects using a chain hoist so putting in a ceiling is a little out of the question. Would it be practical to spray foam insulation between the roof supports or would some sort of sheet insulation be the way to go? I would like to install gas heat in the garage, not for use in the winter bitter cold, but for those times when you have a need to do some project that can’t wait for spring. I’m concerned that heat will melt the snow on the roof in the winter months which will cause terrible ice problems. Suggestions?
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Most types of spayed insulation need to be covered, for fire reasons.
waljay
Your foaming contractor will simply spray foam up in the rafters and then slice the foam off leaving a flush surface for the sheetrock. Foam insulation needs to be sheetrocked over. However it will make a energy efficent insulation and add strength to the garage. (not to mention make it a lot quieter)
Putting ridgid foam up is extremely labor intensive. Not to mention it too must be covered.
Fiberglas is a poor insulator and Celluloise isn't suitable since you don't wish to give up the space for a ceiling.
Wet spray cellulose might be an option. I don't know if it needs to be covered or not. Or dry cellulose behind the netting they use.
It is an ironic habit of human beings to run faster when we have lost our way. --Rollo May
I would think that damp spray cels would need covering. Maybe not for fire reason. But the only thing holding it in place is the starch in the paper. I would expect that after a few years that you would get enough movement from tempature changes and snow loads that you would have cracking and it would start to fall..
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
Dunno. They spray something similar onto structural steel to protect it from fire, and the stuff stays in place pretty well.
It is an ironic habit of human beings to run faster when we have lost our way. --Rollo May
yeah, I agree
all plastic based insulation would need fire protection ... expanded and extruded polystyrene, polyurethane ... the key word is poly ... plastic. polyisocyanurate, too (Thermax).
Maybe other foams, too?
There is a polyiso that is listed for exposesure in uninhibated places such as attics and crawlspaces.Don't know the exact wording to see if it could be used in a garage..
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
Possible use metal building insulation w/ vinyl backing/VB on it (fire rated) made for unfinished spaces.
RE - covering the products mentioned...
It is wise to do so, but not always required. some jurisdictions do not require it and others require it in dwelling units only so if the garage is a separate structure, you may be fine without rocking over the insulation if cost is an issue.
Still wiser to cover it.
speaking of wisdom - I hope you plan to vent that gas heat to the exterior
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