BEWI Inverted Roof Insulation is a closed-cell expanded polystyrene (EPS) with low water absorption properties.

The insulation boards are loose-laid over the weatherproofing, there is no requirement to adhere or mechanically fix the boards. BEWI Filter Membrane is laid over the insulation. Lastly, gravel ballast and/ or paving slabs are used to secure the insulation to the deck. EPS is compatible with and can be laid directly onto hot melt and bitumen-based weatherproof membranes. See installation details for advice on other membrane types.

The system is a lightweight and easy to install solution. There are no requirements for special PPE when installing or cutting the insulation panels.

Features and benefits:

KIWA certified (BAR-19-098-S-A-UK).
Suitable for use on flat roofs with zero pitch and slopes up to 10°.
Resistant to the effects of freeze/thaw.
High compressive strengths available: 200, 300, 500 and 600 grade and 200 Premium+ to suit all applications.
Global warming potential <5.
Ozone depletion potential = Zero.