In homes where roofs are not required to be heated, the attic floor determines the upper part of the airtight envelope of the building. The loft space stays unheated, allowing energy saving, and a smaller area needing to be covered. However, most of the thermal transfer of the roof will take place around the attic floor.
 
Insulation unrolled over the flooring
Insulation unrolled over the flooring
Insulation placed between joist
Insulation placed between joist
Insulation using blowing wool
Insulation using blowing wool
It is therefore important to use adequate insulation and install an effective airtightness and moisture management system.  This is essential to protect the roof, increase the living comfort level and decrease energy losses. The types of insulation used are usually panels, slabs or blowing wool. For all these cases, airtightness can be achieved with membranes laid beneath the insulation layer, on the heated side of the construction.
 
Attic floor with insulation material
Attic floor with insulation material
 

Overview of attic floor solutions 

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