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Description

Alumasc offer a range of options for inverted roof systems including preparation applications and primers for a range of substrates; thermal insulation 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.

General information
Specification data - Reinforced bitumen membrane inverted roof covering systems
Product Reference

Derbigum warm roof (inverted)

Substrate preparation

Not required

Derbifill S

For levelling and adjusting falls.

Hi-Ten 125

Base layer nailed to timber deck.

Hi-Ten bond taping strip

For unsupported plywood sheet joints.

Primer

Not required

Alumasc bitumen primer

General purpose primer.

Derbiprimer E

Water-based primer for porous surfaces.

Derbiprimer GC

Cold spray applied bituminous primer for concrete.

Derbiprimer S

Solvent-based primer for porous surfaces.

Base layer -
Type

Not required

Eurobase GL

Glass reinforced base layer for torch-on and adhesive applications.

Hi-Ten Bond

Glass reinforced base layer for pour and roll applications.

Hi-Ten Torch

Glass reinforced base layer for torch-on applications.

Hydrogard 10

Lightweight glass reinforced base layer for pour and roll applications.

Hi-Ten 125

Lightweight polyester reinforced base layer for pour and roll applications.

Application

Loose laid

Fully bonded - cold adhesive

Fully bonded - hot bitumen

Fully bonded - torching

Intermediate layer -
Type

Not required

Derbicoat Selfix HP

Eurobase GL

Hi-Ten Bond

Hi-Ten Torch

Hydrogard 10

IBabase Oxi 3 mm

Application

Loose laid

Fully bonded - cold adhesive

Fully bonded - hot bitumen

Fully bonded - torching

Mechanically fixed

Top layer -
Type

Derbigum

Mineral faced.

Derbigum Black

Smooth weathering surface.

Application

Fully bonded - cold adhesive

Fully bonded - hot bitumen

Fully bonded - torching

Mechanically fixed

Colour

Black

Brindle

Charcoal

Ivory

Light grey

Rust

Flashings and detail work -
Base layer

Not required

Derbicoat Selfix HP

Eurobase GL

Hi-Ten Bond

Hi-Ten Torch

Hydrogard 10

IBabase Oxi 3 mm

Application

Loose laid

Fully bonded - cold adhesive

Fully bonded - hot bitumen

Fully bonded - torching

Mechanically fixed

Top layer

Derbigum

Derbigum Black

Application

Fully bonded - cold adhesive

Fully bonded - hot bitumen

Fully bonded - torching

Mechanically fixed

Colour

Black

Brindle

Charcoal

Ivory

Light grey

Rust

Insulation -
Type

Not required

Alumasc TF extruded polystyrene

Application

Laid in cold adhesive

Laid in hot bitumen

Loose laid

Mechanically fixed

Thickness

___ mm

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.

Insulation thickness:

Alumsac Technical Services can advise on the most economical thickness of thermal insulation, depending upon the required U-value.

Alternative methods of attachment:

Derbigum can be installed using five different techniques:

  • Torch applied - fully bonding by torching.
  • 'Rapido' - fully bonded in cold Derbibond with laps and detail work torch bonded.
  • No flame - fully bonded in cold Derbibond with laps and detail work hot air welded.
  • Cold - fully bonded in cold Derbibond with laps and detail work sealed with cold Derbiseal.
  • Mechanically fixed - fastened through insulation layer into the deck, with laps and detail work torch sealed.

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.

Third party certifications