Why insulate the attic floor?

Heat rises – to prevent unnecessary heat loss, one of the most financially rewarding energy efficient measures a home owner can take is to insulate their attic.

If modern guidelines are followed a 150mm layer of insulation should be placed between the timber joists running across the attic floor and another 150mm should be placed above this in a crossed format.

e.g. If the layers between the joists are layed east-west the crossed 2nd layer would be layed north-south.

Any more than this total 300mm insulation depth would be almost overkill as the effectivesness of additional insulation would be minimal and not likely to be cost effective.

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