How to properly insulate the attic in a private house

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An attic is an unheated room under a roof formed by roof slopes. In a private house, to preserve heat, the attic is insulated along the floor. This allows you to efficiently consume energy, heating only residential premises. The insulation roofers in pickering on the material from which the inter-floor ceiling of the upper floor is made. In low-rise construction, these are wooden beams or reinforced concrete slabs.

Wooden floors

Wood belongs to the group of combustible materials, so it is better to use mineral wool to insulate the floor. Possessing greater thermal conductivity than polystyrene, it does not burn, and some of its modifications are used in fire protection structures.

The scheme of wooden floor insulation is built taking into account the tendency of wood to get wet in conditions of high humidity. To protect the insulation and load-bearing floor beams from the effects of water vapour in warm air, the vapour barrier is attached to the false ceiling from the side of the room.

The layer sequence looks like this:

  • vapour barrier;
  • false ceiling;
  • floor beams and mineral wool laid between them;
  • waterproofing membrane;
  • a distance bar stuffed over the beams – to create a ventilated gap;
  • attic flooring.

As a vapour barrier, you can use heat-reflecting materials laid with a metallized (foil) surface in the heated room.

Concrete floor slabs

The reinforced concrete floor slab is insulated in different ways:

      • expanded polystyrene (regular or EPS) under the screed with a mechanical or adhesive method of fixing the insulation;
      • mats or rolls of mineral wool;
      • backfill thermal insulation materials of mineral origin (expanded clay, expanded vermiculite).

With any method of insulation, a vapour barrier film is spread over the slab.

Mineral wool and backfill thermal insulation are placed between the logs, the height of which is chosen taking into account the thickness of the thermal insulation layer and the air gap for weathering water vapour from the insulation. If necessary, the laying of mineral wool is carried out in two layers with an additional counter-lattice.  Along the perimeter of the attic, at least one meter wide from the line of intersection of the roof with the walls, a layer of waterproofing membrane is laid.

An attic with one of the perimeter sizes from 10 m and a slope of 40 ° – 45 ° can be converted into a small attic with a ceiling height of 2 – 2.5 m in the central part (under the ridge), even if it is an ordinary gable roof.