| Blown insulation question I am in Tucson Az, where it is/was common to build houses with a nearly flat roof - gable but only a few inches slope from ridge to facia
Roof sheeting is on one side of 2x6 rafters and sheetrock on other
And in my case, the 'insulation' was merely a film of like heavy duty aluminum foil stapled midway between rafters
When i bought the place I needed to replace several sheets of roof sheeting and while roof was partially opened up I slid some rigid foam board in as many cavities as I had access to
Now I am considering improving the roof insulation
Anyone have any experience or knowledge with trying to blow insulation into really tight cavities?
My house is small, from bird boards to ridge is only ~12' but only a couple of inches between sheetrock and foil (board insulation is on top of the foil)
Anyway to 'shoot' the insulation all the way to ridge from the bird boards? |
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Reviews:
 ·AT&T Midwest
| If you want to insulate the underside of the roof, consider spray foam. You would probably want professional installation if they meet your needs. On the other hand, they may insist on removing existing insulation first, so in that case DIY may be worthwhile. |
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| said by StillLearn:If you want to insulate the underside of the roof, consider spray foam. You would probably want professional installation if they meet your needs. On the other hand, they may insist on removing existing insulation first, so in that case DIY may be worthwhile.
Thanks for suggestion, but
To do your suggestion would require I rip all the drywall off my ceilings
That ain't gonna happen... |
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Reviews:
·AT&T Midwest
| If you are trying to fill the cavity, they have trucks that blow in fiberglass insulation. So that may be the deal for you. I don't know what a bird board is, so I was thinking that you wanted the insulation to somehow adhere under a surface.
There are also people who inject open foam insulation into finished walls by removing siding strips outside or drilling and filling holes inside. I think this requires a higher level of skill to do without pushing out the walls from foam expansion. Fiberglass is cheaper than foam, but it is irritating if it comes in contact with skin or especially eyes. For an inaccessible area, it seems to give great performance cheaper than foam. It is less subject to settling than is blown cellulose. I know they can blow fiberglass maybe 10 feet, maybe more, into a cavity that is open on one end.
My knowledge is from a cold weather perspective. Here the vapor barrier goes on the more inward side. For you it should be on the outer side. I would phone a couple contractors that advertize blown-in insulation. Describe your situation, and ask for budgetary info. If they think there may be a good fit, they will offer to come out for a look. If there is no discussion of price before they come, it will probably be more expensive. Those who's solutions are lower cost will be more likely to talk cost on the phone. |
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| said by StillLearn:I don't know what a bird board is, so I was thinking that you wanted the insulation to somehow adhere under a surface. I have heard of soffet vents with round holes cut in them called "bird boards" probably because the holes in them look like the opening of a bird house. |
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| reply to Liberty
said by Liberty:My house is small, from bird boards to ridge is only ~12' but only a couple of inches between sheetrock and foil (board insulation is on top of the foil) Are the bird boards soffit vents and if so are they removable?
If they can be removed a contractor who does blown insulation might be able to get a hose up there and blow and pull back as the cavity fills.
The same would apply to expanding foam, but you would want to be sure the contractor has a clue, because if that foam is over applied it's going to go somewhere and not being able to lift the roof will push the ceiling down. |
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