I’m hoping someone might be able to advise on this. My wife and I are looking to buy our first home and the one we have in our sights at the moment is a BISF house. I was wondering if anyone was able to comment on the ease/problems they may have encountered drilling a vent hole for a tumble dryer through the external wall?

Any advise would be greatly appreciated.



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Hi Matt and welcome! Where are you planning to drill the vent? I presume it will be downstairs so through the render-on-steel-mesh walls rather than through the steel cladding upstairs. The render is pretty tough and contains the steel mesh that you may need to drill through, but is only about 50mm thick. Obviously you’ll need to avoid the steel frame itself and the timber studwork supporting the dry-lining on the inside.

Here’s a photo of the vent we had under the living room window for the old gas fire and back boiler. The silver insulation behind is sealing it up now we have a modern boiler that gets its air supply through the flue.


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