Which side should you put the thermal insulation with foil on?

Do-it-yourself repairs always involve many nuances. For owners of private houses, the acute question arises of which side to lay sealed mats with a foil surface. It is necessary to insulate rooms from the cold and reduce energy costs.

Which side should I put the insulation with foil on?

Foil material is a combined thin layer of insulation, one or two sides of which are equipped with a reflective layer. This is necessary so that the metallized part reflects thermal energy and prevents it from escaping outside the room.

Everyone can understand double-sided foil insulation. It can be laid on either side. But one-sided thermal insulation raises questions.

There are several installation options. They directly depend on the surface and location where the thermal insulation work will be carried out.

For external walls

In this case, the material is laid so that its smooth side faces the street, and the ribbed side rests against the insulation. This method of fastening allows you to retain heat inside the room and effectively reflect it without letting it pass outside.

For the space under the roof

To insulate the roof, it is assumed that the foil material is applied with the metallized side down.The rising heat from the heating devices hits the reflective layer and falls back down.

On the plinth inside the house

In this case, they act in the same way as with external walls. The smooth side is placed at the bottom, and the rough side is turned up, resting it against the insulating layer. This way we “lock” the heat inside the room.

On the ceilings of external walls and partitions

This option differs from the design of external partitions. Experts recommend placing the smooth side towards the insulating material, and the foil towards the ceiling.

Foil insulation with a self-adhesive layer is attached directly on top of the wall, without wasting time on attaching the sheathing. For sheets of insulating material without a self-adhesive strip, a double frame is required. Insulating sheets are inserted into it, and the joints are puttied.