I wonder if anyone familiar with fitting these fires can help.
I have a Burley flueless fire fitted late last year, this sits in a dummy plasterboard chimney breast. Within the plasterboard cavity the builders fitted another cavity with breezeblocks to form a base and side and sealed off the back top with a fireproof board. The side breezeblocks walls were rendered and any gaps sealed with the same render at the back and top.
When the fire is turned on I get large patches of condensation forming on the outside of the chimney breast in both top corners of the cavity. When I say large it I mean up to a foot in height and maybe 6" wide and enough to mop dry with a cloth. It dries up naturally enough but it takes about 45mins from fire up to forming to drying so it doesn't look great for a £1400 fire.
The gas fire itself is not completely recessed into the cavity and a large amount of heat escapes through the top, probably more so than the grill at the front - is this right? There is probably a gap of around 10mm between the fire frame and the wall. The fire itself is a very tight fit within the cavity. The corners of the internal cavity, where the condensation forms are sealed with render and mastic, the fireproof ceiling panel stops maybe inch or so short of these corners.
The seller and gas fitter has spoken to Burley direct who flit between it being normal/natural for condensation to form and/or the cavity not being sealed. I'm not expecting much from Burley, they supply the fire and instructions so it's down to the supplier and fitter to solve.
Does anyone have any ideas to solve this problem? Thanks.
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