Glidevale Protect A1 Roofing Underlay 45mtr x 1mtr

(£41.94 Incl. VAT)
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Glidevale Protect A1 Roofing Underlay 45mtr x 1mtr

Glidevale Protect A1 Roofing Underlay is a third generation roofing underlay which has been developed specifically to overcome the disadvantages of traditional Type 1F felts and second-generation plastic sheet materials.

Protect A1 can be used for all pitched roof constructions (tiled and slated), whether the insulation is at ceiling joist level or at rafter level.



  • Length: 45mtr
  • Width: 1mtr
  • Roll Size: 45 m/2
  • Material: Twin-ply construction of polypropylene non-woven spunbond layer with UV stable PP film
  • Roll weight: 7kg (including core)
  • Has unrestricted use for wind uplift in all exposure conditions in the UK & ROI


  • Dark grey upper surface reduces glare and takes a chalk line marking
  • Surface printed with product branding for ease of identification


  • To be laid in accordance BS 5534: Part 1 and manufacturer's instructions


  • Maintains water tightness even after exposure to water based preservatives
  • Can be used as a temporary roof covering for up to three months before the roof covering is laid
  • Excellent nail tear and tensile strength
  • Easy to cut, clean and light to handle
  • Unaffected by temperature changes
  • Proven time saving over 1F Felt
  • Unrestricted use for wind uplift in all exposure conditions in the UK and Ireland


  • As with most underlay materials, do not lay in direct contact with any un-dried timber preservatives (whether water or solvent based).
  • To prevent UV degradation of the underlay, & to avoid sagging and ponding of the underlay behind fascia and ensure correct water discharge into the gutter, underlay support eaves trays (available separately) should be used at all gutter details.
  • Roof space ventilation should be provided at both low and high level as with all impermeable (type HR) roofing underlays irrespective of insulation type or position.
  • A1 has unrestricted use from zones 1 to 5 at the maximum batten gauge of 345mm.
  • No adhesive tapes are required to restrain the overlaps.
  • Where insulation follows the rafters, there must be a ventilated air space at least 50mm deep above the insulation and beneath the underlay.