Verified by manufacturer 1 month ago
BBA Agrément Certificate
Rigid PIR insulation for warm flat roofs under built-up felt, mastic asphalt and single ply membrane waterproofing.
For flat roofs under built-up felt, mastic asphalt and single-ply membrane waterproofing systems.
Powerdeck® F is a high performance rigid polyisocyanurate (PIR) foam board for use in warm flat roofs under built-up felt, mastic asphalt and approved single ply membrane waterproofing systems. It is faced both sides with a mineral coated glass tissue.
Mastic asphalt waterproofing
An isolating layer of Type 4A sheathing felt must always be used in mastic asphalt waterproofing systems. This isolates the asphalt from movement in the substrate, allows the lateral movement of moisture vapour and warm air during installation of the asphalt and acts as a vapour pressure release in service.
To ensure adequate drainage the roof should have a minimum finished fall of 1:80. This may mean designing for twice the minimum finished fall to account for building inaccuracies, roof deflection and building settlement. Powerdeck® F boards are also available for tapered insulation schemes.
With increasing levels of insulation it is important to ensure the continuity of insulation at the junction of elements.
The wind uplift force exerted on the roof will vary according to geographical location, site location and building height. Reference should be made to BS 6229 for adequate bonding of the vapour control layer to the deck to help resist wind uplift. Calculations relating to the bonding and any supplementary fixings should be made with reference to BS 6399.
Features and benefits:
Other thicknesses available on demand (subject to minimum order quantity).
J21/10 Warm deck roof coating
J21/420 Rigid urethane foam insulation
J41/10 Reinforced bitumen membrane warm deck roof covering
J41/420 Rigid urethane foam insulation
J42/10 Warm deck roof covering
J42/420 Rigid urethane foam insulation
To BS EN 13165.
Reaction to fire (product as such) - EN 13501-1 - Euroclass F.
When tested in accordance with BS 476-3 and CEN/TS 1187, a system comprising 18 mm plywood deck, a polyester reinforced aluminium core VCL, a 120 mm thick insulation board, a layer of 1.7 mm thick IKO Systems S-A underlay and a IKO Ultra prevENt bitumen membrane, achieved an EXT.F.AC and Broof(t4) (Low vulnerability in Scotland) rating respectively and is acceptable for use less than 6 m from a relevant boundary.
Compressive strength at 10% deformation
Exceeds 150 kPa at yield.
Suitable for loads associated with maintenance traffic. For heavier traffic, extra precautions should be taken (consult the waterproofing manufacturer for appropriate details). Care must be taken to avoid damage to boards by impact or concentrated loads during installation.
Face size (length x width)
(Other sizes available on request).
1200 x 600 mm.
± 30 kg/m³.
Faced both sides with a mineral coated glass tissue.