BBA Agrément Certificate
Certificate type
Alumasc offer a range of options for cold roof systems, suitable for refurbishment or new build work, including preparation applications and primers for a range of substrates and Derbigum base, intermediate and top layers. Derbigum is a TPO (Thermoplastic polyolefin) modified bitumen roofing membrane which can be installed using a number of techniques, including torching, pour and roll applications, cold applied or mechanically fixed. Derbigum membranes can be applied as a single layer for quick application, or may be applied as the base or cap layers in a built-up high performance roofing system.
Uniclass 2015 | |
CAWS | J41/12 Built-up reinforced bitumen membrane cold deck roof covering J41/130 Built-up reinforced bitumen membrane cold deck roof covering |
Product Reference | Derbigum cold roof |
Substrate preparation | Not requiredDerbifill SFor levelling and adjusting falls. Hi-Ten 125Base layer nailed to timber deck. Hi-Ten bond taping stripFor unsupported plywood sheet joints. |
Primer | Not requiredAlumasc bitumen primerGeneral purpose primer. Derbiprimer EWater-based primer for porous surfaces. Derbiprimer GCCold spray applied bituminous primer for concrete. Derbiprimer SSolvent-based primer for porous surfaces. |
Base layer | - |
Type | Not requiredEurobase GLGlass reinforced base layer for torch-on and adhesive applications. Hi-Ten BondGlass reinforced base layer for pour and roll applications. Hi-Ten TorchGlass reinforced base layer for torch-on applications. Hydrogard 10Lightweight glass reinforced base layer for pour and roll applications. Hi-Ten 125Lightweight polyester reinforced base layer for pour and roll applications. |
Application | Loose laidFully bonded - cold adhesiveFully bonded - hot bitumenFully bonded - torching |
Intermediate layer | - |
Type | Not requiredDerbicoat Selfix HPEurobase GLHi-Ten BondHi-Ten TorchHydrogard 10IBabase Oxi 3mm |
Application | Loose laidFully bonded - cold adhesiveFully bonded - hot bitumenFully bonded - torchingMechanically fixed |
Top layer | - |
Type | DerbigumMineral faced. Derbigum BlackSmooth weathering surface. |
Application | Fully bonded - cold adhesiveFully bonded - hot bitumenFully bonded - torchingMechanically fixed |
Colour | BlackBrindleCharcoalIvoryLight greyRust |
Flashings and detail work | - |
Base layer | Not requiredDerbicoat Selfix HPEurobase GLHi-Ten BondHi-Ten TorchHydrogard 10IBabase Oxi 3mm |
Application | Loose laidFully bonded - cold adhesiveFully bonded - hot bitumenFully bonded - torchingMechanically fixed |
Top layer | DerbigumDerbigum Black |
Application | Fully bonded - cold adhesiveFully bonded - hot bitumenFully bonded - torchingMechanically fixed |
Colour | BlackBrindleCharcoalIvoryLight greyRust |
Paint finish | - |
Type | Not requiredDerbipaint EWater-based acrylic. DerbisilverBitumen-based aluminium finish. |
Colour | AluminiumBlackGreenLight greyTerracottaWhite |
Product Options | Substrate primer: Concrete decks, screeds and metal decks should be primed with Derbiprimer. On plywood decks all board joint should be taped. On close boarded timber decks, a layer of Hi-Ten 125 should be nailed to the deck. Alternative methods of attachment: Derbigum can be installed using five different techniques:
Top layer: Derbigum can be supplied with a flat glass fibre reinforced weathering surface or with a mineral finish which comes in a range of colours. |