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ROOFING • GREEN ROOFS
STRUCTURAL WATERPROOFING
SOLAR PV • SINGLE PLY
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AXTER ROOF WATERPROOFING AND INSULATION SPECIFICATION

Supporting deck Existing waterproofing
Application Two-layer waterproofing with insulation
System reference FORCE LINE

Existing waterproofing with added thermal insulation
Two layer waterproofing

Reinforced bitumen membranes should only be applied over a continuous substrate which provides full support. Substrate Materials used to form the roof deck in flat roofs should be those listed in BS 6229:2003 Flat roofs with continuously supported coverings – Code of practice and conform to the relevant requirements in BS 8217:2005 Reinforced bitumen membranes – Code of practice.

The waterproofing system should conform to the requirements of British Standard 8747:2007 Reinforced Bitumen membranes (RBMs) for roofing – Guide to selection and specification and be installed in accordance with British Standard BS 8217:2005.

Supporting deck Existing membrane or asphalt waterproofing system
Deck preparation Ensure substrate is sound, cut and seal all blisters, remove details. Prime all surfaces with a suitable bituminous primer and allow to dry in accordance with Annex C of British Standard BS 6229:2003.
Vapour control layer Existing waterproofing will act as the vapour control layer.
Thermal insulation PIR rigid foamed boards
Waterproofing system Base layer THERMECRAN
  Intermediate layer FORCE LINE 3 VV
  Cap sheet FORCE LINE 4.5 RE
  SP classification S4P3
Details FORCE LINE 4.5 RE
Finishes Self protected system

Product substitution

  • The two layers, THERMECRAN and FORCE LINE 3 VV, can be replaced by a single layer of HYRANGER SPOT ADH self adhesive membrane. In which case the thermal insulation must have a coated glass fibre surface such as EL 3000 from CELOTEX or TR 27 from Kingspan.
  • FORCE LINE 4.5 RE can be replaced by FORCE LINE 4 RE.

NBS specification

Please view the Axter NBS specification for further information.

Notes

All membrane products torch applied except THERMECRAN which is loose laid.

PIR rigid foamed boards laid in hot or cold applied bitumen or PUR adhesive.

 

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