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How To Insulate A Metal Building Roof. Roof/wall (new install) over purlins: In this case, simply lay the insulation between the purlins.
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Install the panels and insulation on one side of the structure first to reduce the chances that the wind will blow the insulation away. Building regulations for insulating a roof. Once the first roof panel is installed the insulation can be unrolled on the roof panel and slid into place.
If you insulate as you have described, the vapor barrier must be done very well.
As the universal way to insulate a steel building, foam or “rigid boards” are ideal for practically any type of climate. When it reacts with the oxygen in the air and the water dries up, the polyurethane foam will expand, harden, and cure within minutes, which results in thick, rigid foam. Apply double sided tape on the top of purlins (helps keep the insulation from blowing in the wind). Roof/wall (new install) over purlins:
