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Do you put the shiny side of foil insulation up or down on a metal roof?

Foil insulation is recommended under a metal roof. The shiny side should be facing up, but there's a catch. Foil insulation is a radiant barrier, and it works by reflecting heat from the metal, but for it to do its job, there has to be a layer of air between the roofing and the foil.

specifile.co.za - How to install Bubblefoil | Alucushion - Insulation Suppliers - Specifile

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Alucushion®/Bubblefoil® can be installed under steel roofing (Industrial Application) and under roof tiles (Domestic Application). Foil insulation is recommended under a metal roof. The shiny side should be facing up, but there’s a catch. Foil insulation is a radiant barrier, and it works by reflecting heat from the metal, but for it to do its job, there has to be a layer of air between the roofing and the foil. Some types of metal roofing are shaped to create this air space, but if you’re installing a type that doesn’t, you should construct an attachment structure. For proper installation of roof insulation, you need to do it before the roofing goes on. If you want to add foil insulation to an existing roof, you can still do it by stapling undersides to the roof rafters. If you do this, the shiny side of the insulation still goes up, and the rafters automatically create an air space between the insulation and the roofing.

Why would you need foil insulation?

When sunlight directly hits a metal roof, it dramatically increases the temperature to uncomfortable conditions. If there is no foil insulation barrier, the underside of the roof radiates all the heat directly into the ceiling. The ceiling overheats, the building becomes warmer and air conditioning becomes far too expensive. Alucushion. suppliers of Bubblefoil give detailed instructions on how to install this efficient foil into a building.

Industrial Application

Step 1 Fix PVC coated straining wire from the top apex purlin, over intermediate purlins to the bottom eave purlin at 383 mm centres – first straining wire to be fixed 50 mm away from the gable end. Evenly tension all wire ensuring that cut ends face downwards.

Step 2

Industrial Application 2

Lay Alucushion® / Bubblefoil® FR over the straining wires ensuring that it is squared off. Fix to apex purlin using double-sided tape. Evenly tension material and fix to eave purlin again using double-sided tape.

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