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Insulating on old house
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14
comments (14 topical, 0 editorial)
Re: Insulating on old house
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by fcfcfc on Sat Dec 15th, 2007 at 12:48:50 PM MST
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User Info
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Hi: Blowing insulation can be tricky. A proper vapor barrier is key when putting insulation in a wall. Cellulose is nice in the wall and fairly easy to do. But you need to get a good pack in the wall and start with the insulation really "foofed" up when putting it into the blower hopper. What I used to do is cycle it once through the blower to air fluff it, then blow that into the wall. Outlets and switches should be sealed first and a good primer sealer applied to the wall (2 coats) which will help act as a vapor barrier. The prep work takes as long as the blowing itself. Cellulose in the wall goes for about R4 per inch if done right. Use 1-1/4" black poly pipe that comes in the big coils and attach to the nozzle. Have the piece about 7' long and cut the one end at a 45 Deg angle. Smooth the rough edges. Then drill a single hole about 18" from the bottom of the wall for each stud space. You shove the tube in and up to the top of the wall (the 45deg helps in slide up). You can feel the insulation going in. When it stops, wiggle the tube and keep doing that until the wiggle doesn't work any more, then pull the pipe down about a foot and keep doing the same thing until you are at the bottom. That way you get a fairly uniform density through the cavity.
Insulating on old house
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14
comments (14 topical, 0 editorial)
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