cavity regulations

[fastneattrowel]

hiya
hoping theres a expert on the latest building specs,iam adding on a extension on a bungalow 2 metre to a bedroom which the original house has a 75m cavity,i been told to make my new build with a 100 m cavity which means i have to dub out the inner wall with dry lining to bring it in line, it just dont make sense as three months ago i was working on a site doing extentions to a old peoples home and 75 m was acceptable and its for the same council, can anyone throw a bit of light on this much appreciated john

 

[noseall]

100mm cavities is normal by today's regulations, if using regular dri-therm cavity fill, unless you can use a more expensive, higher standard cavity fill that will achieve the same u value.

you can also use a lesser width cavity but this means beefing up the inso' on either the outside or inside, then you are back to square one.

 

[fastneattrowel]

cheers noseall,rest of the bungalow no insulation at all so this add on with all the latest specs is a complete waste of time in my opinion,understand if it was seperated, perhaps the occupiers might all huddle up and keep warm at one end of new room ie the new part lol ,thanks anyway

 

[^woody^]

100mm cavities are cack

Use a turbo inner block, or a high performance insulation (Isovar Hi-cav)