Replies

1. 
   Ron_Schroeder | Nov 03, 1999 07:22pm | #1

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   I would put sheet foam between the steel truss and the drywall for a thermal break and wet spray the cellulose. At 3/12 pitch you may not have a problem even with dry spray, ask several cellulose contractors.

1. 
   Sue_V. | Nov 05, 1999 04:29am | #2

   *Is there an Icynene contractor in your area? I would have Icynene sprayed on the underside of the roof. It would not need to be held in place, and it certainly wouldn't slide. It is ideal for steel, and you would not need to ventilate the roof. Good Luck - do your homework.Sue

1. 
   Ian_ICF_Builders | Nov 05, 1999 06:58am | #3

   *Thanks guys...& gal.I checked into a couple jobs the insulation contractor has done, and they are performing well. He is going to spray wet cellulose in after drywall. I checked into Icynene, but it was spendy. There is a urethane foam guy in the area, he offered a system that was walkable, even between the trusses, directly over the drywall, he was less than the Icynene, and I thought the fact that it was walkable would be beneficial since I know someone, if they have to go up there will slip off the steel and probably poke a hole in the ceiling...the day before closing or some convenient time. Thanks again Ian

1. 
   andrew_d | Nov 08, 1999 06:50am | #4

   *Wet cellulose after drywall? My impression was that wet cellulose was for when you didn't have barriers in place to contain it. Can't you just use plain vanilla dry cellulose and possibly get better void-avoidance? :) Ram in it there like heck -- not fluffy at all, the more the better -- and it will not move anywhere. I've experimented with driving cellulose into wall stud cavities with a temporary form, and the cellulose stayed in the cavity uncovered for weeks afterward.

2. 
   IanICF_Builders | Nov 08, 1999 06:53am | #5

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   One of my latest ventures is a 2400 SF single story ICF wall house. The walls are 8' tall on the sides, and angle up to 16'high at the center of the house, all of the ceilings inside are vaulted up to the center point of the house. The trusses are steel. The exterior (roof) pitch is a 6/12, the interior is a 3/12, so there is about 6 or 7 feet of height in the attic at the ridge. We are about to hang drywall, and at the advice of an insulation contractor, we are planning to blow in cellulose on top of the drywall and bottom chord of the steel truss to an R-30. I was talking to another builder, and he said I would have trouble with the cellulose sliding down the sheetrock over time, and that some netting needed to be employed first. The house is 60' wide, so each side of the vault is about 35', I asked the insulation contractor about it, and he laughed.....am I being taken on a ride down a cellulose slide? appreciate it in advance, and by the way, the house is sold, so I want it done right, no chance for call backs.