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Closing old extractor fan hole - expandable foam?

micks_address · 2014-01-31 09:28:16

Hi Folks, New kitchen being fitted and a new hole for new cooker hood/extractor fan required. The old one was rectangular in shape - probaly 9 inches by 6 inches in size. Cavity block used in house build, with steel bar vent on external wall. To close up the old hole I was thinking of filling with expandable foam. The…

31-01-2014 9:28am

#1

micks_address

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Posts: 8703

Hi Folks,

New kitchen being fitted and a new hole for new cooker hood/extractor fan required. The old one was rectangular in shape - probaly 9 inches by 6 inches in size. Cavity block used in house build, with steel bar vent on external wall.

To close up the old hole I was thinking of filling with expandable foam. The inside is being tiled over so the tiler could just tile over the foam then.

any issues with using expandable foam? would i need to put a damp proof lining inside the vent before filling to avoid the foam possibly getting wet?

Cheers,
Mick

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#2 31-01-2014 7:31pm

gutteruu

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I filled 2 large holes I had with expanding foam then polyfilled over and painted. Still perfect 2 years on. Can't see any cold bridge problems especially if you are tiling over it.

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