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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 Inverted - two-layer waterproofing with insulation
System reference FORCE LINE

Inverted 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.
Waterproofing system Base layer THERMECRAN (perforated)
  Intermediate layer FORCE LINE 2 VV
  Cap sheet FORCE 3000 Line RE
Details FORCE LINE 4.5 RE
Thermal insulation XPS rigid boards, thickness to meet required U-value
Breather membrane Loose lay breather membrane with taped joints
Finishes Min 50 mm thick layer of 20 to 40 washed rounded river gravel

Product substitution

  • FORCE LINE 2 VV can be replaced by FORCE LINE 3 VV or HYRANGER 25/25 TS
  • 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 products torch applied except THERMECRAN which is loose laid.

 
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