Underlay for use in all types of metal-clad pitched roof and wall constructions excluding lead.
Delta®-Trela and Trela Plus consist of a 3-ply spun-bonded polypropylene breather underlay base sheet laminated to a dimple-textured random-fibre spacer mat to provide a permanent air gap under the cladding, preventing moisture accumulation. Delta®-Trela Plus includes an integrated self-adhesive edge.
|Uniclass 2015||Vapour permeable sheets (Pr_25_57_10_94)|
|Standard product features|
Dimple height (approximately):
B2 rating to DIN 4102.