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studs, tounge and groove, foam board, drywall....

studs, tounge and groove, foam board, drywall....


  #1  
Old 04-15-09, 02:46 PM
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studs, tounge and groove, foam board, drywall....

So i have a dilemma in that the 3 1/2" space between the sloped ceiling and my room should be free of insulation for air space to travel under the roof, preventing ice dams in the winter.

So i have removed the insulation between the roof and the sloped ceiling by drilling holes. I plan on leaving the old tounge and groove horizontal slats, installing foam board over the for insulation, and then drywall over that.

What would be my best option for installation? the foam board would be 1 1/2" thick (or should i go even thicker?) over thin, maybe 1/4" thick tounge and groove. Should i just glue the foam board, and then use extra long (do these exist?) drywall screws to hit the studds through the foam, through the tounge and groove, and into the studs?
 
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Old 04-15-09, 05:51 PM
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It's been a long day. Let's try to sort this out. You drilled holes in your ceiling to remove the insulation above it. Is that correct? How far apart are the horizontal slats? Is this a tongue and groove ceiling? There should have been air baffles installed against the decking of the roof and the insulation installed under it and above your ceiling. The baffles would have allowed sufficient air movement to the ridge vent. Are there any baffles installed? Placing the insulation directly on the ceiling boards will cut down on your ceiling height considerably. I have never seen 1/4" tongue and groove anything.
Give us a little more information as to what you have and what you hope to accomplish and why you removed the insulation. Pictures may help.
 
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Old 04-15-09, 06:17 PM
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This is a drawing of my house



indicated in red is the area im refering to. Where the roof cuts into the ceiling off all the rooms on my top floor.

The area is only as thick as the 2x4 rafters. I installed baffles as deep as i could but that only reaches half way down and the remainder is inaccessible.

What i could possibly do is remove the tounge and groove on the diaganal portion of the ceiling, add baffles to the lower section and fill the rest in with insulation.

What was suggested to me is to remove the insulation, which was some cellulose and some mineral insulation the name escapes me, leaving air space, frame underneath adding insulation and then drywall over that.

1 1/2 insulation will impact space less than framing out with 2x4s and covering that will drywall.

what i meant by 1/4" tongue and groove was how thick it was and even then, its probably more like 1/8th
 
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Old 04-17-09, 02:55 PM
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1 1/2" insulation won't give much R value. I would probably do as suggested, pull the T&G, baffle it and add insulation, frame below it and re ceil it with sheetrock or another product. And you description of T&G is getting to me. Tongue and groove can't be that thin and still be millable.
 
 

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