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- 11 Dec 2007
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Looking to see that we don't end up making another howler. Currently we have a multi fuel stove installed in to a fairly shallow recess in the chimney breast.
We've had damp issues and as such everything has been tanked using Sovereign Chemicals products and IIRC the finish at that point was 'Renderlite', this was then boarded on top of using 'Magply' as we were advised to use "A1 rated non-combustable boards". Painted with standard Dulux emulsion paint as per advice online and the stove then installed.
Problem is that the gap between the stove and the rear wall is barely 10mm. More like 5mm-7mm. The minimum advised from the manufacturer is 50mm. I was in touch with HETAS who also say Magply is not recommended.
The effects are that at the immediate rear the paint is now flaking (we're 2 years in). The boards 'pop away' from the walls. Even the sides pop slightly and then when everything cools they 'settle down'.
I was in touch with the guy who installed it who agreed that the stove is too close to the board and that they now no longer board out the recess. Instead they render it. He did warn that this may crack a little. They add fibres for strength he says. So this is his take on it - come back out, cut the boards out and then render the inside and refit the stove.
2 questions at this moment:
1) How would you tackle it with a render approach? From what i've read he would/should need to throw lime in to the mix (what kind? Hydrated?) Anything else? What sand should he be using - standard building, plastering, sharp? I'm very wary about it cracking and also how bad it's likely to crack. Hairline is one thing, half of it falling off is another.
2) Would you put a bend in to bring the stove away from the back wall? As said, the recess is quite shallow so that will actually bring the stove out beyond the face of the chimney breast a little.
If you need any more info, pictures etc then just ask.
We've had damp issues and as such everything has been tanked using Sovereign Chemicals products and IIRC the finish at that point was 'Renderlite', this was then boarded on top of using 'Magply' as we were advised to use "A1 rated non-combustable boards". Painted with standard Dulux emulsion paint as per advice online and the stove then installed.
Problem is that the gap between the stove and the rear wall is barely 10mm. More like 5mm-7mm. The minimum advised from the manufacturer is 50mm. I was in touch with HETAS who also say Magply is not recommended.
The effects are that at the immediate rear the paint is now flaking (we're 2 years in). The boards 'pop away' from the walls. Even the sides pop slightly and then when everything cools they 'settle down'.
I was in touch with the guy who installed it who agreed that the stove is too close to the board and that they now no longer board out the recess. Instead they render it. He did warn that this may crack a little. They add fibres for strength he says. So this is his take on it - come back out, cut the boards out and then render the inside and refit the stove.
2 questions at this moment:
1) How would you tackle it with a render approach? From what i've read he would/should need to throw lime in to the mix (what kind? Hydrated?) Anything else? What sand should he be using - standard building, plastering, sharp? I'm very wary about it cracking and also how bad it's likely to crack. Hairline is one thing, half of it falling off is another.
2) Would you put a bend in to bring the stove away from the back wall? As said, the recess is quite shallow so that will actually bring the stove out beyond the face of the chimney breast a little.
If you need any more info, pictures etc then just ask.