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LIQUIROOF Insulation Boards web image v3LIQUIROOF P OSB 3 from EAP – Thermal insulation and seamless sub-structure in one working step.

LIQUIROOF PIR insulation boards deliver a super-flat surface ideal for liquid and flat roofing systems. Liquid waterproofing coatings are typically between 1.25 to 2mm thick meaning even the most minor imperfections in the substrate surface can create alignment issues and stress points on the outer surface coating. LIQUIROOF fully supported boards interlock on all 4 sides, from top to bottom, to create a strong and solid surface with no raised edges, misalignment or gaps.

Faced with a lightweight 8mm OSB 3 panel on the topside, LIQUIROOF panels are designed for use on old or new boarded structures. The polyurethane rigid foam insulation core provides maximum insulation with minimum panel thickness. The serrated edges on the boards slot together easily to cover large uneven surfaces, and with minimised alignment time are quick to install.

LIQUIROOF cut awayKey Benefits

  • No coating stress points
  • No surface crushing during installation or maintenance
  • No delamination
  • No vapour escape at board edges
  • Compatible with; Liquid Applied Systems, felt and EPDM
  • Thermal Conductivity:0.022W/mK
  • Panels can be cut to size with standard tools

It is recommended that the deck is covered with a suitable vapour barrier and the insulation boards fixed using Guardian Thermally Broken Fixings.

The LIQUIROOF P OSB3 rigid panels can be installed over:

  • Concrete
  • Wooden boarding
  • Plywood panels
  • Steel profile sheets
  • Over existing roof spaces as a recovery board

Life Expectancy

Providing it has been installed in line with the manufacturer’s recommendations, LIQUIROOF is designed to last the life of a building with the board retaining its U-value as well as its structural and acoustic integrity.

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LIQUIROOF P OSB uses high quality materials and is proven for use with liquid applied roofs. 

Reliable Insulation

  • Insulation that can be walked on and loaded
  • High compressive strength and dimensional stability
  • High-quality, water-repellent OSB 3 surface
  • Thermally bridged fixings

High Quality

  • The precision cut serrated edges ensure a rigid joint and preventing vapour drive across all elements
  • Double layer 100% aluminium backer – warm side and cold side
  • Homogeneous, full-surface insulation

PUR(E) Energy Saving

  • Insulating core made of PUR/PIR rigid foam
  • Positive building biology: Free of CFC, HCFC, formaldehyde, and fibres
  • High insulation values with minimum panel thickness achieves constantly
  • Positive life-cycle assessment

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LIQUIROOF complies with BS EN 13165:2012+A2:2006

Insulation core: PUR/PIR rigid foam acc. to EN 13165, class E, aluminium foil on both sides

Facing: OSB 3 panel, 8 mm thick

Edge joints: PUR/PIR rigid foam serrated on all sides, OSB panel with rabbet edges on all sides

Sizes Available: 1200 x 1200 mm, 2440 x 1200 mm (coverage is 1 cm less). Other sizes are available.

Fire rating: Standard EN 13501-1 Class E, s2, d0

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LIQUIROOF Build Up 600


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Panel Thickness and U-Value ratings

LIQUIROOF U Value Table web


















Related Documents

[fontawesome icon=”download-alt” circle=”no” size=”medium”]LIQUIROOF Insulation Boards brochure

More Information

Wondering whether LIQUIROOF PIR insulation boards are suitable for your project?

For more information contact our technical helpline on 01509 501731

Book our CPD which compares a range of roofing systems



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