Covertek 407 heavy duty roof and wall underlay, our strongest synthetic underlay, designed as a means of managing condensation, water vapour transfer and water ingress in the most trying conditions including applications where the roof pitch is 3° and above.
Can only be used in lined applications. Section E2 of the NZBC defines lining as 'the rigid sheet covering for a wall, ceiling or other interior surface". Must NOT be used in any unlined applications, including but not limited to sheds, warehouses, garages, canopies, soffits and lean-to designs.
Warranty void when used in unlined applications.
