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Anybody know if there is a difference between PIR boards made for walls & the stuff made for roofs? My local builders merchant sells Xtrathem for cavity walls which will work well for insulating between the rafters of my loft. Just want to find out if there is any real difference between...

Have a problem that's driving me mad. I fitted two new radiators last night, this was moving one that was over sized in the kitchen & replacing the bathroom with a towel rad. All went ok, I turned the boiler off, drained the system, fitted new radiators. After that I bled the system making sure...