Floor slab thickness

Jim · 2009-02-26T16:30:40+00:00

We've had some plans drawn up for Building Regulations approval for aextension/refurbishment.Our architect has specified the concrete slab at 150mm throughout. Ourgroundwork contractor reckons that it can be poured at 100mm (this addsup to a saving of a few hundred quid).Does anyone know what the pros and cons are and what building controlare likely to say? Is the thinner thickness more likely to fail? Ipresume it adds thermal mass if we want UFH.

Feb 26, 2009 21 Replies

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Phil L 17 years ago

in which case the subject title would have been 'raft thickness' - two totally different things, and 150mm is nowhere near enough WRT a raft

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dennis 17 years ago

Well I asked the head of building control the question while we were feeling a tree..

He said that it isn't worth saving a few quid on something that should last a hundred years. It will only save you about 1.9 m3 of concrete or about £150.

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