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Covertek 403 roof underlay can be used as a direct fix or a cavity fix for roof construction. It consists of micro-porous water laminated film that is placed between two layers of spun bonded polyolefin. It is made from a fire-resistant, absorbent, synthetic material and helps in managing condensation, water vapour transfer and water ingress. It can be used in drained cavity, timber and steel frame buildings with absorbent and non-absorbent wall claddings direct fixed to framing.
- Strong, durable and lightweight
- Unaffected by LOSP timber, can be used where walls are unlined such as attics and gable ends
- BRANZ appraised
- More stable and more shrink-resistant than Kraft paper based underlays