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Old 02-15-2009, 11:07 AM   #1
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sheet rock screw size?


I am installing 1" 4x8 Rmax board under 1/2" sheetrock on to the 2x6 rafters as part of my ceiling project on my attic conversion.
How would you fasten the 1" insulation board? I'm assuming you run the board perpenticular to the rafters

Once up, I want to put insulation tape on seams before putting up sheetrock.
Also, what screw size would you use to go through the insul board and sheet rock?


Any help would be greatly appreciated.

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Old 04-07-2009, 08:58 PM   #2
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sheet rock screw size?


Back when i used to hang drywall we used to use a "rule of thumb" that screw length should be double the thickness of your board...so we used 1 1/2 or 1 3/8th screws when hanging 1/2" board.

With the extra insulation there I'd say you would want to use minimum 2 1/2 inch screws....and probably 3" would be better

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