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Unread 07-28-2015, 07:17 AM   #2
Brad Denny
Tile Contractor Nashville, TN
 
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Join Date: Mar 2007
Location: Joelton, TN
Posts: 4,163
James,
I couldn't say anything official, but I've used foam board to patch a few times. Take it for what it's worth...

In this case, the possibility of removing a piece and leaving the board intact is very slim IMO. Cutting straight through the board in the grout joint and removing the whole section might be best. I've blocked with Kerdi Fix'd strips of board to support the missing piece...which would need a bead of KFix all around as a sealant to the existing board to be waterproofed.

I've also "hot patched" with KBoard, but you wouldn't have a 2" area around this hole to adhere the facing without removing more tile.

I'm surprised the glass door would crush the board. I have no idea the actual numbers, but the point load shouldn't be greater than what a tiled board could handle.
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