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?