Proposed Wall mounted gas meter cab - hole in external required level?

30 Mar 2012
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United Kingdom
Am getting my meters moved.

500 thk wall - made up of 100 conc. block, 50 void, 350 breeze.

re the 38mm hole that takes the gas pipe (in a plastic duct) from the proposed wall mounted meter cab to a ground floor bathroom.

Does this hole have to be drilled level? Or can it be drilled to falls, sloping downwards from inside to outside, in order to put the odds against water ingress in my favour? My place is an end of row and that wall gets it biblical in the winter..

I've already drilled it with approx. a 60mm fall over the 500mm wall thickness before remembering that the existing flush cab (set in a conventional thickness 2 leaf and void wall) has a cast/forged steel 90° elbow outlet on top of the meter?

The hot potato warning siren went off over at the Wales & West advice desk when I phoned them, so no answer there..
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