PermaBase can be fastened with either a 1-1/2" galvanized roofing nail or 1-1/4" cement backer board type screws are used with wood framing. If you are attaching the PermaBase to 20 gauge or heavier metal framing, use 1-5/8" S-12 cement backer board screws. DO NOT use typical drywall screws.

On the walls and floor/countertops, attach fasteners 8" o.c. in each direction. On the ceilings it's 6" o.c. in each direction.

As you apply pieces of PermaBase next to one another, leave a gap of 1/8". You will pre-fill this gap with mortar during the taping process.

You will need tape the seams with a 2" wide alkali resistant mesh tape. Using your trowel, pre-fill the gaps between the boards and coat the area with your mortar. Place the mesh tape over the joint and remove excess material using your trowel.

You can use a typical drywall utility knife score and snap the PermaBase cement board. Turn board over and make a second pass of this cut. The edge will be clean and smooth.

National Gypsum Company (click for more information)

Click below for information on the use of Permabase for ceramic tile and stone installations.
Ceramic tile installation facts and photos