Roofboards – Flat Roofs
Polyisocyanurate (PIR) insulation products are the most commonly used insulation product in flat roof applications. The boards offer, as a result of their excellent thermal performance, the thinnest method of achieving the current u-value requirements of Building Regulations / Technical Standards.
PIR insulation products offer dimensional stability and good compressive strength whilst being much lighter and easier to handle than other insulation products.
The insulation has the ability to withstand foot-traffic; this is an essential characteristic, especially when used in modern flat roofs waterproofed with single-ply membranes. Unlike PIR insulation products, some insulation materials depress under foot-traffic creating dips in the roof where water can collect (known as water-ponding). When water-ponding occurs the design life of the roof can be seriously compromised as a result of thermal stress, alkaline formation and mould growth.
PIR insulation products are available with a wide range of facings. The choice of facing is dependant on the application i.e. a glass reinforced perforated cellulose facing would be used for an insulation board being employed in a partially bonded built-up felt application.
Benefits of PIR/PUR insulation products for flat roof applications:
- Provides the best thermal performance;
- Dimensional stability;
- Good compressive strength and resistance to foot-traffic;
- Constant thermal performance for lifetime of the building;
- Resistant to moisture ingress;
- Non-fibrous and do not emit harmful emissions;
- Does not support the growth of fungi;
- Easy to handle and install