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Covertek 407

Is a Fire Retardant Self Supporting Synthetic Building Underlay for the use under all claddings. Consisting of a microporous water resistant film, sandwiched between two layers of mould and shrink resistant spun-bonded polyolefin. It is intended as an alternative to kraft paper roofing underlays, which are fixed over timber or steel framed roofs in order to limit the entry of wind into the roof cavity and to assist in the moisture management of the cladding system.

Key Features

  • Fire Retardant
  • Fully Synthetic
  • Product Certification

Advantages

Can be used in direct fix or cavity fix for roof or wall construction. Is more stable and more shrink resistant than kraft based products. May be installed during adverse conditions (rain/snow) without affecting durability or performance. Will not increase risk of condensation as compared to comparable kraft underlays. Has an edge tear greater tha 300N. Has a 150mm lap line printed on each edge.

PropertiesUnit
Construction:
Non-Woven / Breathable Film / Non-Woven
Basis Weight (g/m²):
220
Roll Sizes (m²):
1250mm x 25m (25m2), 1250mm x 40m (50m2)
Roll Weight (kg):
5.5, 11
Flamability (Fl):
≤ 5
Water resistance (mm):
Requirement: 100mm (Roof Underlay)
Pass: Yes
Vapour Permeability (µg/N.s):
> 2.5
Vapour Resistance (MN.s/g):
< 0.5
Requirement: ≤7.0
pH Extract (pH):
Requirement: 5.5-8.0
Pass: Yes
Shrinkage (%):
Requirement: ≤ 2%
Pass: Yes
Air Barrier:
--
Durability (Years):
50
Max UV Exposure (days):
7
Wind Zone:
Very High
Requirement: R1/R2
Duty Classification:
Unclassified
Requirement: W1/W2/R1/R2
Absorbency (g/m²):
> 150
Cavity:
--
Cladding:
Direct Fix Absorbent Cladding, Direct Fix Non Absorbent Cladding, Direct Fix Metallic Cladding
Breathable:
is_breathable
Vapour Control Layer:
--
Roof Pitch:
≤ 8°, > 8°
Supported:
Self Supporting
Fire Retardant:
fire_retardant