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I have three dormer windows upstairs in my house, and as part of renovating the whole place have stripped the inside of the cheeks back to the 100mm stud. When built they were filled with glasswool. So, what’s the best way to reinsulate? They’re ply sheathed without any ventilation I can see...

I'm having a new combi fitted (Vaillant EcoTec Plus 831), and i've been advised that i may need to replace the current 22mm pipework from the meter with 28mm, in order to achieve 19mbar working gas pressure at the boiler, under load. It's currently a run of around 6m with three 90 elbows. The...