NSAI have indicated their preference for a cardboard type card as opposed to plastic as cardboard offers more porosity than plastic and if a leak occurs in the roof it is more likely to become obvious with a cardboard type card and remedial works can be carried out by the homeowner . With the plastic card the leak will not become obvious as the plastic will retain the water and guide it towards the eaves and eventually the chute, however water lying continuously on the roofing timbers for long periods will lead to rotting of the timbers and damaging the integrity of the roof structure. Anybody considering having spray foam applied to their existing home or new build should ensure that firstly the spray foam system is certified by the NSAI and secondly that the system is installed in compliance with the certificate
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Foamox Dublin. Park West, Nangor Road, Dublin 12.
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