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Veltitech 145

Veltitech 145 is a lighterweight, non-breather underlay which can be specified as a replacement for a vapour-permeable underlay where eaves and high level ventilation are already included. NHBC requirements updated in Jan 2011 state that a vapour-permeable underlay must have high level ventilation on New Build projects. This was because a vapour-permeable underlay alone does not completely remove the risk of condensation during the drying out period on new build houses.

Non-breather membranes are also used in Scotland where the roof structure normally includes rigid sarking onto which the underlay is laid.


  • A strong, yet lightweight, non-breather underlay
  • Robust construction allows Veltitech to withstand the highest wind loading found in the UK
  • Provides high tear resistance, tensile strength and protection against rain
  • Can be used with eaves and ridge ventilation as a price sensitive alternative to vapour-permeable underlay
  • Excellent Nail tear resistance
  • Suitable for traditional vented roof systems

General Information


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Redland, the company that invented dry-fixed roofing systems, with patents dating back to 1966; has launched two new dry verge products to coincide with the publication of BS 8612

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