About 2 years ago we had a 5kw wood burning stove installed in our living room. We had no chimney breast so it was installed in front of a plaster wall, with a length of uninsulated pipe, followed by twin wall pipe which runs through the ceiling.
Behind the stove is Victas heat resistant plasterboard, and then Victas heat resistant plaster. This is only directly behind the stove. When it was installed, it was left for about two weeks to dry before being painted, and the stove wasn't used for approx another month.
Over the last two months of using the stove, cracks have appeared following the line of the plasterboard. The cracks are getting slightly wider, and I assume it is caused by the plasterboard expanding and contracting as it heats and cools. This is then causing small hairline cracks in the plaster elsewhere in the wall. There are also big cracks appearing directly behind the stove.
Picture are attached showing the stove, and some close ups of the cracks. Should this be happening with heat proof plaster and plasterboard?
Can anyone help with options to resolve? So far I have thought of the following:
I've thought about digging out the cracks and filling with some flexible polyfilla, and then painting over. I'm worried the cracks will just reappear, and also that painting over the flexible polyfilla will look obviously different to the rest of the wall.
Digging out the cracks and filling with normal plaster, in the hopes it has expanded and contracted as much as it will do, but again worried they will reopen.
Tiling straight over the plastered wall and hoping it dissipates the heat enough to avoid the plasterboard expanding and contracting.
Cut a square of plasterboard out of the wall the width of the hearth and slightly taller than the stove, and tile straight onto the brick behind to ensure maximum heat distribution.
Try filling the cracks with normal filler while the wall is warm,where there is fierce heat there is always an amount of hairline cracks.Try fireing up the stove slowly so the wall has time to absorb the heat.
Im not sure if this helps but when we got our wood burner ( also 5KW ) the guy that installed it insisted that we got hardibacker fitted to the walls to prevent the paster from cracking, We have never had a problem so it maybe worth getting some fitted.
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