New Part L1b and cavity wall thicknesses

Does anyone know any details on the implications of the new Part L b/regs and cavity walls and for that matter floors and roofs?

I have spoken to a number of BCOs from different authorities and none seem clear. One mentioned that walls should now have 100mm cavities, another said that there are other elemets that need more insulation too. One guy admitted that they were not clear and they were waiting for guidance documents to be sent to them.

100mm cavities seem way OTT

dg

Reply to
dg
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Why? Cavities don't cost much and insulate well when filled with insulation. Mine are 90+mm on a house built 30 years ago.

Reply to
dennis

There are remarkably few prescriptive rules in the new AD. For new houses the average area weighted U-value of walls has to be no more than 0.35 (the same as in 2002) with no wall worse than 0.7.

The more general check is that the CO2 emissions from your new dwelling has (in simple terms) to be at least 20% less than those from a similarly sized building built to 2002 standards, but how you deliver that 20% is largely up to you: if you want to stick with the same U-values and do it all with a condensing boiler, solar and/or PV panels then you can.

Reply to
Tony Bryer

They became applicable on the 6th of April I believe. Donwill

Reply to
Donwill

On Sat, 15 Apr 2006 07:30:28 +0100, a particular chimpanzee named "Donwill" randomly hit the keyboard and produced:

But not available.

The whole implementation of the changes to Parts L, F and P (which have been overlooked in the mess over L) is a shambles. The draft documents referenced other documents which weren't published, so the implications of the changes couldn't be worked out; the changes to the regulations and the transitional arrangements weren't published until the very last day (literally). Without knowing the transitional arrangements, applicants and building control bodies didn't know if developments were to be checked under the old or new Part L, and if under the new, whether their proposals would comply. The Approved Documents apparently had so many mistakes in them they've had to be pulped and republished, and as of last Thursday, aren't yet available except online.

Reply to
Hugo Nebula

Appalling!!!! yet it doesn't surprise me this day and age. We are rapidly becoming a third world country. Donwill

Reply to
Donwill

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