A Metal roofing underlay should be vapour-permeable, yet water-resistant and airtight. When used in combination with genuine accessories it can help to reduce condensation, improve overall airtightness, add thermal efficiency, and protect structural integrity.
Besides allowing condensation beneath stainless steel, aluminium, copper, and zinc roofs to drain away, an appropriate Metal Roof membrane also reduces sound transmission such as rain clatter, and minimises material stress by permitting a degree of movement between the cladding and the timber beneath.

Protect Your Roof with a Metal Roofing Underlay

A Metal Roofing Membrane is a roofing drainage underlay which drains away the condensation that can build up beneath standing seam and other kinds of metal roofs.

The chosen metal roofing underlay should be vapour-permeable, yet water-resistant and airtight. When used in combination with genuine accessories it can help to reduce condensation, improve overall airtightness, add thermal efficiency, and protect structural integrity.
Besides allowing condensation beneath stainless steel, aluminium, copper, and zinc roofs to drain away, a proper Metal Roofing membrane also reduces sound transmission such as rain clatter, and minimises material stress by permitting a degree of movement between the sheets and the timber beneath.

These membranes usually are a little bit pricier than the regular membranes, but they do pay off in the long run. Giving the roof a tighter fit and a longer lifespan.

The roofing drainage underlay is fitted beneath   metal sheet roofs and the underlying timber boarding. The use of 150mm wide timber boarding with 2mm gaps between is recommended.

Popular Brands and Options:

TYVEK METAL
DOERKEN DELTA TRELA PLUS
KLOBER PERMO SEC METAL