Rock wins full marks for tackling roof deflections

When a major contractor was commissioned to renovate over 20 schools it asked Rock to install inverted roofs on the first projects to get the green light.

The kit specified was Rock’s Flexiphalte triple protection system – a fully-bonded waterproofing system combining:

• High performance membrane
• Durable Flexiphalte Pommar polymer modified mastic asphalt
• Dow Building Solutions’ ROOFMATE SL-A insulation

It was covered with ballast and paving slabs for a standard inverted roof finish.

Prior to installing ROOFMATE, the team wanted to ensure adequate drainage, without having to lay additional screed on what had been designed as a ‘zero pitch’ roof. The solution was to survey the roof for deflections and add additional Flexiphalte Pommar asphalt to potential problem areas, enabling a flat finish and ensuring water run-off to drainage outlets already installed.

The additional asphalt fuses entirely with the existing layer, providing a fully-bonded system without deflections. The solution can be added at design stage where a zero pitch roof is favoured for cost reasons, or retrofitted if deflections need to be addressed once waterproofing is complete.

Visit www.wearerock.co.uk for information on Flexiphalte triple protection. For information on ROOFMATE SL-A, visit www.styrofoam.co.uk or email fklmail@dow.com.

Image: Deflections can cause ponding on flat roofs

Tel +44 (0)20 3139 4000

www.styrofoam.co.uk
fklmail@dow.com
msharkey@WeAreRock.co.uk

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