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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Building Questions >> Utility Room wall upgrade https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1244571558 Message started by RodA on Jun 9^th, 2009, 7:19pm

Title: Utility Room wall upgrade
Post by RodA on Jun 9^th, 2009, 7:19pm

My utility room was built on the back of my garage by the previous owner. It's end wall (not load bearing) is single 100mm Bradstone on a concrete 80mm thick slab.

I want to improve the construction by adding an extra wall making a cavity wall built on proper footings. My questions are:
1. What cavity thickness should I go for 50, 75 or 100mm?
2. From the footings up to the bottom of the existing concrete slab will be clay (under the slab), should I fit batts in this, and if so do I need to put in a vertical membrane between the clay and the bats?
3. Will conventional wall ties be ok between the existing wall and the new wall or do I need something stronger to help support the old wall?

Thanks for any suggestions

Rod