Ledger stone on drywall detaching from gas fireplace heat

[joe_d75]

The 1” thick ledger pieces above my inline gas fireplace keep detaching from the drywall behind them. i tried high temperature adhesive to put them back but they keep dropping from the heat. I am not sure how to approach securing these tiles, any ideas? the screen frame of the fireplace is the only thing stopping these pieces from dropping to the ground. It is smooth drywall behind these pieces. i don’t know why contractor didn’t use something else behind this.

 

[nealtw]

Do you know what adhesive you used?

 

[joe_d75]

Do you know what adhesive you used?

i’m pretty sure it was a loctite contruction adhesive PL200 or PL375.

 

[nealtw]

i’m pretty sure it was a loctite contruction adhesive PL200 or PL375.

I don't think it the heat, it's more about total coverage and good contact. With the product on both the wall and the stone.
The one problem that shows up is the fire place has a restriction on how close the wood framing can be to the fireplace above it, so when you have drywall with nothing behind it there is nothing really to push against.

 

[bud16415]

Does the stone feel hot to the touch when running the fireplace? If so and the backing is drywall was the framing done with wood or steel studs?


You know the manufacture of the fireplace I would look for their recommended installation guide and see what it says first. Next time you have them off I would do a few exploratory holes to confirm what is behind the drywall also.

 

[nealtw]

Does the stone feel hot to the touch when running the fireplace? If so and the backing is drywall was the framing done with wood or steel studs?


You know the manufacture of the fireplace I would look for their recommended installation guide and see what it says first. Next time you have them off I would do a few exploratory holes to confirm what is behind the drywall also.

They put triangles of sheet metal like wedges on top of the unit as a limit to where the wood framing is done. below that t should be concrete board. Typical builders trick to use drywall.

 

[mabloodhound]

Cement board should have been used as a backer.