PRODUCT DESCRIPTION AND STRUCTURE:
2 Layers laminate made up of 38 gsm LDPE Bonding and 80 gsm Spunbond
Dimensions: 1.5m x 30m
Coverage: 45m2 (nom.area excluding overlap)
Coverage: 40,5m2 (nom.area including overlap)
Mass per Unit Area: 118gm2
Marley Undertile Membrane should be stored in a clean, dry environment and should not be exposed to direct sunlight.
The membrane is installed horizontally across the rafters, starting at the eaves, with each subsequent layer overlapping the lower layer by 150mm (minimum), with the overlapping line of 150mm facing upwards.
The membrane is tacked to the trusses with sufficient galvanised clout nails to secure the membrane in position until the battens are installed on top of the Marley Undertile Membrane.
The membrane between the trusses must be sufficiently taut, while allowing a shallow trough to facilitate run-off should rain water penetrate the tiles.
- At the eaves it is important that the membrane is taken from under the second-last tiling batten over the tilting batten to prevent ponding of water.
- Tilting battens should be installed as soon as possible to prevent damage to the membrane by wind, and roof tiles placed to minimise exposure to the sun.