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Thanks. Agree that ideally I would want another layer over the top but they’re very narrow dormers. Squeezing insulation where possible seems like the best option.

And of course autocorrect has turned dormer into dormer for me!

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 see. There's a four burner hob, and a gas fire. They all tee off from a short section of 28mm off the meter. So, is this a regulatory requirement for sign off, or sensible caution on the engineer's part? I'm not trying to catch him out, just trying to understand what might need to be done, and...

Well to be fair the vaillant spec. says 20mb, so I guess 19 comes from +/-1mb?

Thanks, it sounded a bit sub-optimal. Is this in the regs somewhere? I had a look through the Part A pdf, but it didn't seem to mention notching specifically.

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...