What is the Perimeter / Area (P/A) Ratio?

25 April 2017 Kingspan Insulation Middle East
perimeter over area ratio floor plan

The perimeter / area ratio is worked out by dividing the exposed perimeter given by the floor area, and this will calculate how much floor insulation is needed.

So, our technical department will require two things: the area of the floor and the exposed wall perimeter.

Exposed wall refers to only the walls that connect you to an uncooled space, so this will mainly be an outside space or it could be areas such as a garage.

The smaller the P/A figure the smaller the amount of insulation that is required, for example, a large area with a small exposed perimeter will have less heat gain and, therefore, will require less insulation.

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