What is the Perimeter / Area (PA) ratio?

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 need. So, when you ring up about floor insulation 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 unheated 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 loss and, therefore, will require less insulation.

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Kingspan Insulation is a market leading manufacturer of optimum, premium and high performance rigid insulation products and insulated systems for building fabric and building services applications.