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Home Pitched Roofing Roofing Membrane Breathable Membrane Redland Spirtech 400 2S Vapour Permeable Roof Underlay 50m x 1.5m Roll

Redland Spirtech 400 2S Vapour Permeable Roof Underlay 50m x 1.5m Roll

Code:
920200/400-2S
Brand:
Redland

Made from spun bonded polypropylene, this Spirtech 400 2S is a four-layer, vapour-permeable underlay designed for pitched roofs. Boasting exceptional strength, durability and hassle-free installation, it offers an innovative solution from Redland as a heavy-duty underlay featu... Read More

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£366.00 Incl. VAT
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Description

Made from spun bonded polypropylene, this Spirtech 400 2S is a four-layer, vapour-permeable underlay designed for pitched roofs. Boasting exceptional strength, durability and hassle-free installation, it offers an innovative solution from Redland as a heavy-duty underlay featuring a unique adhesive system. This system brings horizontal laps together, creating an impervious membrane that persistently resists wind uplift.

This Spirtech 400 2S underlay is perfect for both warm and hybrid roof systems, where wind penetration could compromise roof insulation performance at rafter levels, as well as traditional cold roofs. It effectively counters wind uplift forces, ensuring reduced wind loading on roof tiles. It benefits from comprehensive coverage under Redland's 15-year SpecMaster guarantee when integrated into a SpecMaster project.

Features & Benefits: Redland Spirtech 400 2S Vapour Permeable Roof Underlay 50m x 1.5m Roll

  • Superior water-tightness after abrasion
  • Exceptional protection against falling objects
  • Easy to bond joints
  • Heavyweight underlay with grid reinforcement
  • Glue strips, ideal for high and low outside temperatures
  • Improves energy efficiency
  • Delivers a windtight sealed roof system for warm and hybrid roofs
  • Heavy-duty underlay with a unique two-strip glueing system for horizontal laps
  • 50m length x 1.5m width (75m² roll size)
  • 15-year guarantee when used as part of a SpecMaster project

To establish an airtight membrane, the vertical side laps of this Spirtech 400 2S demand sealing with Redland's DivoTape or other compatible Redland underlay accessories. DivoTape, a UV-resistant PE foil with mesh reinforcement, delivers airtight sealing for laps and junctions. It's effortlessly stretchable and tearable by hand, measuring 60mm wide and 25m long.

For complying with BS 5534:2014 underlay requirements and achieving robust wind uplift resistance across the UK, there's no necessity to bond or seal the vertical side laps (only horizontal ones) if the vertical laps align with rafters or counter battens. However, if they don't, sealing or bonding is recommended for a wind-tight membrane. For roof pitches from 12.5° to 14.5°, you will require a 225mm to 150mm headlap, a headlap of 150mm to 100mm for 15° to 34.5° pitches and a 100mm to 74mm headlap for 35° pitches and above.

Standards & Certification

  • BBA certification: Pending for Spirtech 400 2S
  • At 450mm and 600mm rafter centres: Achieves sufficient wind uplift resistance to comply with BS 5534: 2014 for use everywhere in the UK with all tile formats

Dimensions

Length 50m Width 1.5m

Details

Application Cold Roof
Hybrid Roof
Pitched Roofs
Warm Roof Permeability Vapour Permeable Roll Size 75m2

Questions & Answers

Question:

I think my roofer may have installed one strip of felt upside down. Battens are installed but not the tiles yet. Could this be a problem? Thanks

Answer:

The strip upside down will be letting vapour into the roof instead of away from the roof as its meant too

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