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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 Concrete
Application Two-layer waterproofing with insulation
System reference FORCE LINE

Concrete Deck
Two layer waterproofing system with thermal insulation

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 Reinforced concrete with screed to falls if required
Deck preparation
  • Ensure deck is smooth (free of all but minor surface defects), dry, and free of dust, laitance and nibs.
  • Prime with a suitable bituminous primer and allow to dry
Vapour control layer HYRANGER 25/25 TS
Thermal insulation PIR insulation, thickness to meet required U-value
Waterproofing system Base layer THERMECRAN (perforated)
  Intermediate layer HYRANGER 25/25 TS
  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 HYRANGER 25/25 TS can be replaced by a single layer of HYRANGER SPOT ADH self adhesive membrane. In this case the thermal insulation must have a coated glass fibre surface such as EL 3000 from CELOTEX or TR 27 from Kingspan.
  • HYRANGER 25/25 TS can be replaced by FORCE LINE 2 or 3 VV.
  • 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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