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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 -inverted
Application Two-layer waterproofing with insulation
System reference FORCE 3000 TRAFIC green roof

Green Roof
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 HYRANGER 25/25 TS
  Cap sheet FORCE 3000 Trafic
Details FORCE 3000 Trafic
Thermal insulation XPS rigid boards, thickness to meet required U-value
Breather membrane Loose lay breather membrane with taped joints
Finishes

Extensive green roof: DRAINAX G water retaining reservoir plus growing medium, min 6 cm, and greening (sedum mat, plug plants, etc.).

Intensive or brown roof: AXTER DRAINAGE BOARD plus filter layer, plus soil and plants to landscape architect’s design.

Ensure a water supply is available to bed in the greening and for maintenance purposes.

Product substitution

  • HYRANGER 25/25 TS can be replaced by FORCE LINE 2 or 3 VV.

NBS specification

Please view the Axter NBS specification for further information.

Notes

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

 

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