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Roof Pitch:

Supported or Self Supporting:

Breathable: Any Yes No
Vapour Control Layer: Any Yes No
Air Barrier: Any Yes No

Products  >  Underlay  >  Covertek 407
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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 frammed 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

Advantages

Can be used in direct fix or cavity fix for roof or wall construction.Is more stable amd more shrink resistant than kraft based products.May be installed during adverse (rain/snow) without affecting duribility or performanceWill not increase risk of condensation as compared to comparable kraft Underlays.Has an Edge Tear greater tha 300NHas 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 25, 1250mm x 50
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
Breathable:
is_breathable
Vapour Control Layer:
--
Roof Pitch:
≤ 8°, > 8°
Supported:
Self Supporting
Fire Retardant:
fire_retardant