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Hi, We're insulating our roof with 140mm kingspan. To keep the costs down I'm wondering about using insulation 'seconds'. But before going ahead I'm wanting to know if there is any disadvantage of using these compared to firsts. Any help would be much appreciated.

I'm planning to insulate my loft conversion with kingspan; 35mm between the roof rafters and 100mm under, going across the rafters. How do I then attach plasterboards to them? For the screws to go through the plasterboard, kingspan and into the rafters 25mm I'll need 137mm screws. I can only...

Hi, I have a converted loft. It has stud walls, a sloping ceiling, then a flat ceiling at the top. The Roof is slated and has some sort of membrane above the roof joists. The roof also has 4 ventilation points on either side. I have insulated the back of both stud walls, the 'floor' (ceiling...