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Air bricks - Clay or Plastic

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I need to fit air bricks in a new external leaf, 9" x 6" gaps have been left . As a new ground slab is in place there are 2 x 100mm diameter pipe in the slab leading through to the original under floor void.

Is there a preference for plastic or clay bricks?


(I should also check in the void that the ends of the pipes are open under there and no current infestations)

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Seeing as nobody else has chipped in on this one...

I am taking a bit of a stab in the dark but my preference would be clay, as I would expect less thermal expansion/contraction, no UV issues, etc.

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