Atactic Polypropylene. Derbigum is manufactured from the highest quality APP, known as TPO (Thermoplastic Polyolefin).
High melt point & UV resistance, resulting in extended life and low maintenance costs.
12, 15 and 20 years, covering latent product defect and workmanship. Extended warranties and/or enhanced terms are available for selected projects upon application.
A network of Derbigum Approved Contractors, covering the whole of the UK and Eire.
Yes - No. 86/1593C
Yes – all Derbigum cap sheets and underlays carry the CE mark.
In excess of 30 years.
Glass fibre - remain stable under heat of torched application. Never use lightweight polyester reinforced base layers.
Yes, in Spitzbergen, where winter temperatures can reach minus 50°C
Prevents sticking in transit/storage.
It is the glass reinforcement which is just underneath the bitumen surface of the product. The glass fibre gives the product stability in hot conditions, prevents shrinkage, and reflects heat.
Standard mineral colours are light grey, dark grey and charcoal. Other colours may be available to order, subject to minimum production quantities – contact Alumasc for further details.
Stability under torching/reflection of heat in use.
Tensile strength/resistance to puncture.
Rapido 200+ m²/person/day. Cold 130 m²/person/day. Torch 100 m²/person/day.
4 bar (60 psi). Never use any gas other than propane.
600 million m².
18 million m².
F.AA to BS476 pt3 1958 (equates to EN1187/4)
F.AC to BS476 pt3 1958 (equates to EN1187/4)
Yes – Derbigum (FM blend) is specially formulated to meet Factory Mutual requirements and is available to special order.
Yes - a special formulation is available which meets all the relevant European Standards (ENV 1187:2002 tests standard 1