GoBoard Install Guide

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How to Seal & Waterproof GoBoard
to Walls & Ceilings
Remember, GoBoard is inherently waterproof, but any edge, joint,
change of plane, and fastener location must be sealed to protect the
whole system against water damage and mold.
1
Apply sealant on every nail or screw hole
2
Use a putty knife to spread the sealant
Check every edge, joint, change of plane and fastener location
to ensure complete coverage and no pinholes.The slightest pinhole
may result in a leak, so careful attention is required when sealing joints.
Additional, Optional Waterproofing
It is recommended, but not required, to use a liquid waterproofing
for wall applications if you use mesh tape and mortar instead of
polyurethane sealant. If a waterproof installation is required:
• Seal all joints and fastener locations with two coats
of liquid waterproofing membrane
• Extend the membrane at least 1" beyond the mortar
• Allow to completely dry
NOTE: Sealant must extend onto GoBoard surface at least 1" beyond the joint on either side
NOTE: Make sure each fastener location is completely covered with at least a 2½" diameter
patch of sealant, centered over the fastener