Grassroof with Regarm is a green roof system made using recycled polypropylene interlocking cellular pavers with a recycled moisture-retaining blanket. It is designed to be installed over an existing roof membrane on new and existing flat roofs.

Grassroof with Regarm can be used for extensive, simple intensive, and intensive applications. It reduces soil depth, weight, and water run-off, supports vegetation and biodiversity, and protects underlying roof membranes.

  • Green roof system for flat roofs using a recycled moisture-retaining blanket

  • Reduces soil depth and weight for easier installation, especially on retro-fit projects

  • Extensive dry roof weight typically 5,26kg per m2

  • Slows surface water run-off, helping manage drainage and reduce flood risk

  • Supports natural filtration and evapotranspiration to help reduce urban heat

  • Improves thermal insulation and noise reduction

  • Protects roof membranes from UV and weathering

  • Encourages biodiversity and urban green space

  • Contributes to environmental assessment schemes such as BREEAM, LEED, and BASIX

Applications

  • New-build flat roofs

  • Retro-fit projects on existing flat roofs

  • Commercial and residential buildings

  • Urban developments seeking to increase green space

  • Projects aiming for environmental assessment credits

  • Areas requiring improved stormwater management

  • Spaces supporting biodiversity and pollinator habitats

  • Green roof overlay system for flat roofs

  • Interlocking pavers with moisture retaining layer

  • For use on existing or new flat roofs

  • Laid over existing roofing membrane

  • Suitable for extensive and intensive green roofs

System components

Interlocking pavers

Grassroof interlocking pavers are made from recycled polypropylene. They can be laid either directly onto the installed roof membrane or onto a foil backed polystyrene underlay for intensive roofs or where the roofing membrane is subject to impregnation.

The cellular core structure of the paving units can be foot trafficked during installation.

Properties

  • Overall: 635 x 330 x 32mm

  • Module: 622 x 311 x 32mm

  • Number per m2 : 5.17

  • Weight each: 0.85kg

  • Weight per m2 : 4.39kg

  • Material: Polypropylene (recycled)

  • Colour: Carbon black

Moisture retaining blanket

Grassroof is designed to be used with a Regarm moisture-retaining blanket which is made from 100% recycled shredded garment waste bonded to a woven fabric layer.

It enables the retention and attenuation of moisture to both feed roots or to source control roof top run-off.

For extensive roof applications, the specification of Regarm will enable the omission of a soil layer. For high-rise buildings, this reduces the volume of bulk materials to be transported up through the building during installation.

Properties

  • 2.0m x 10.00m x 8mm compressed thickness

  • Weight per m2 : 0.72kg

Grassroof green roofs

Grassroof extensive

  • Grassroof pavers, Regan and Sedum

  • Simple “leave and lay” format

  • Sedum turf stores moisture

  • No soil required

  • Typical dry weight: 5.26kg per m2

Grassroof simple intensive

  • Grassroof pavers, Regan, 1:1 soil and perlite, and Sedum

  • Typical dry weight at 50mm soil cover: 30.26kg per m2

Grassroof intensive

  • Grassroof pavers, Regan, 1:1 soil and perlite, and planting as required

  • Typical dry weight with 100mm soil: 55.26kg per m2

  • Typical dry weight with 500mm soil cover: 255.26kg per m2

Accessories

Regam holding down pins

Polypropylene pins for securing the Regarm blanket to the underlying Grassroof units.

For use in exposed locations.

  • Head dia: 40mm

  • Length: 40mm

  • Approx fixing centres: 1200 x 1200mm

Foil backed polystyene underlay

For positioning beneath the Grassroof units by default for ‘Intensive’ roofs and where the roofing membrane, is susceptible to ImpregnatIon for ’Extensive’ and ‘Simple Intensive’ applications.

  • Thickness: 3.5mm

  • Roll size: 1200mm wide x 10m long

  • Weight: 0.20kg/m2

Edge restraints

Grasskerb GK60 units

  • Length: 1000mm

  • Width: 80mm

  • Height: 60mm

  • Weight: 0.46kg each

  • Composition: Re-cycled HDPE

  • Colour: Carbon black

Grasskerb GKP/1 self adhesive fixing pad.

  • Length: 75mm

  • Width: 20mm

  • Thickness: 5mm

  • Application: 5No. per m