Foil insulation underlayment is recommended under a metal roof, and in most cases, 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.
No air space means no thermal value. The reflective side must be facing downwards when in roofs, upwards when installed underneath a floor and inwards when installed in walls.
Regardless of the method, the foil should be placed on the warm side of the room.
The fibre side is laid in contact with the ceiling. If you were creating a warm attic by insulating between rafters, then you would want little temperature difference between the inside insulation surface and the room. So the foil side should face the slates and the fibre side the attic space.
The shinier the foil, the better it will work--but the shiny side should be installed facing down toward the attic. Don't just lay radiant barrier material overtop floor insulation either, or it won't work. There should be an air gap on both sides--so attach it to the bottom of the roof rafters.
(The general rule for insulation is that the facing always goes toward the conditioned space.) The second layer of insulation should be unfaced so that moisture doesn't collect between the layers.
With most brands of membrane, the printed side will be facing outwards. However, always ensure to double-check any installation instructions provided by the manufacturer. Draping the breathable roof membrane instead of laying it taught ensures that the moisture does not run off quickly.
When installing fiberglass insulation in your home, be sure to put the paper or foil vapor barrier facing toward the heated and cooled living area of the home (down in attics, up under floors, in on walls) to prevent condensation from occurring.
Quite simply, it doesn't matter what side of aluminum folk you use. Either is acceptable. Since the exact same material makes up both sides, they will perform precisely the same way. The only difference is aesthetic.
Foil has a shiny side and a dull side because of how it is manufactured. Unless you are using foil that's labeled non-stick, which does have a non-stick side, it does not matter what side you use. Both the shiny and dull sides can be used the same way to cook, freeze, and store food.
Start laying the insulation furthest away from the access hole then work your way back from the outside edges in. Install the insulation between the ceiling joists and butt pieces together at all joins.
There are two sides to Thermafleece Breather Membrane, a black side and a grey side. On a wall: the black side faces outwards, the grey side faces towards the inside of the building. On a floor: the black side faces the ground. In a roof: the black side faces the sky.
Either side of the foil can be used to place food on, unless you are using Bacofoil® The Non-Stick Kitchen Foil, then the food should be placed on the non shiny side side, as this is the side that is coated with a food safe silicon to stop food from sticking.
Foil roof insulation has excellent thermal properties. The reflective layers of the foil efficiently block radiant heat transfer, reducing the amount that enters or escapes the building through the roof.
Install the Foilboard® GREEN rigid insulation panel to the external face of the studwork, ensuring the anti-glare side is facing out, measure the area you require. Tape all penetrations, joints and gaps using the Foilboard® green PVC tape, ensuring the stop of cold / hot air transfer.
Foil insulation is particularly effective at reflecting radiant heat, which can be beneficial in both summer and winter. However, in order for it to work effectively, there needs to be an air gap between the foil layer and the surface it's installed on.
The facing refers to the paper or foil side of insulation products. Always install the facing toward the heated or air-conditioned part of your home. This creates a vapor barrier that prevents moisture from passing through and getting trapped in the insulation.