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i have used 25mm celotex to insulate my internal walls which then has 25 * 50 MM. battens on top to hold it up. I then want to put 25 MM insulation between the battens. I also want to add a new socket on the ring. The cable will be clipped to the side of batten and will not touch the insulation...

I installed Velux double glazed windows about 10 years ago and when you sit under them you can feel a cold down draft. I plan to install Velux windows in my kitchen, would triple glazed stop this cold draft or would there not be much difference compared to the latest double glazed versions. Thanks

I’m going to replace two existing roofs, both to be vaulted ceiling with velux windows. They meet each other with a valley / box gutter. I friend of a friend has done the structural calculations but I have still have a few questions. Roof 1 (inside size 11ft by 7ft) Ridge 50 * 170 * 7ft...