BUILDING PAPER

Lead fitted to a roof in applications including gutters, vertical cladding, pitched and flat roofing, firstly require the correct ventilation detail to be incorporated into its design.

This prevents the build-up of condensation which can cause corrosion to the underside of the Lead.

To protect the underside of Lead Sheet from corrosive attack from concrete, stone, screed, oak and plywood substrates, the Lead should be isolated from the substrate using Building Paper.

BLM Grade A1F Building Paper is a traditional, reinforced bitumen-bonded building paper laminate, manufactured with wet-strength Kraft paper, meeting the technical requirements of BS 1521 Class A.

FEATURES

Protects the underside of Lead from alkalis in concrete, stone and screed surfaces.

Reduces corrosive attack when laying Lead onto oak and plywood substrates.

DIMENSIONS

Available in 25m x 1.0m rolls.

Permastrip and Copper Strip are recommended for use as fixing clips to prevent the lifting of the free edges of Lead flashings in high wind conditions.

They should be used to secure cladding panels at both horizontal and vertical edges of bays. Permastrip and Copper Strip should be cut to length to form clips that suit the application.

DIMENSIONS

Permastrip - Coil length 20m, width 50mm, thickness 0.5mm.

Copper Strip - Coil length 20m, width 50mm, thickness 0.6mm.