ALUMASC EXTERIOR BUILDING PRODUCTS LTD

Tel: +44 (0)1744 648400 Email: waterproofing@alumasc-exteriors.co.uk

Website: www.alumascwaterproofing.co.uk Ref: SD001FR Issued: 01/06/12 Page 1 of 2

DerbigumSingle Layer Cold-Applied Bituminous Warm Roof

When to Specify Derbigum single layer, cold applied, high performance warm roof systems offer the highest levels of thermal insulation, durability and waterproof integrity, combined with the optimum speed of installation, particularly suitable for large projects and fast-track construction.

Warranties Alumasc offers a comprehensive range of warranty options. The typical warranty period for Derbigum is 20 years. Installed exclusively by Derbigum Approved Contractors and underpinned by Alumasc’s extensive project support service, Alumasc warranties cover both product and installation. Independent insurance backed latent product defect warranties are also available through FSA licensed brokers.

Key FeaturesLifespanIn the Derbigum BBA Certificate 86/1593C, the BBA say ‘All available evidence suggests that the product will have a life in excess of 30 years.’

DurabilityDerbigum has a high softening point ensuring stability of the membrane in the hottest weather, high tensile strength and excellent puncture resistance. Derbigum can be installed without any surfacing, regardless of the method of application due to the unique blend of polymers which make Derbigum resistant to UV degradation.

PerformanceDerbigum is a range of dual-reinforced, APP (Atactic Polypropylene) modified bitumen, high performance roofing and waterproofing membranes with a life expectancy of 30-35 years according to independent assessment. Enhanced performance properties include low temperature flexibility, excellent fire ratings, stronger reinforcement and ease of application.

Cost-effectiveDerbigum Single Layer Systems combine proven durability with speed and ease of installation. Options for completely flame-free application, high speed spray installation (in excess of 1000m2 per day) and mechanical fixing are available in a BBA approved and fully warranted system.

QualityAlumasc operates a quality assurance management system which is independently audited to BS EN ISO 9001:2008. Alumasc extends this quality management to their network of approved installers, for single source accountability and peace of mind.

EnvironmentAlumasc actively pursues sustainability in the full range of products and systems the company offers through its accreditation to the ISO 14001:2004 Environmental Management Standard. Alumasc, its partners and its suppliers are committed to putting consideration for the built and wider environment at the core of all aspects of their current business and future development. Derbigum membranes are 100% recyclable.

Derbigum Cap Sheet (Black or Mineral)

Derbibond Cold Adhesive

Alumasc GTF PIR Insulation

Nilperm Vapour Barrier

Metal Deck (primed) CERTIFICATE No 86/1593

ALUMASC EXTERIOR BUILDING PRODUCTS LTD

Tel: +44 (0)1744 648400 Email: waterproofing@alumasc-exteriors.co.uk

Website: www.alumascwaterproofing.co.uk Ref: SD001FR Issued: 01/06/12 Page 2 of 2

DerbigumSingle Layer Cold-Applied Bituminous Warm Roof

Application1. Prime the profiled metal deck with Alumasc Bitumen Primer and allow

to fully dry.

2. Apply the Nilperm vapour barrier, fully bonded in hot bitumen to the crowns of the deck, providing edge protection to the insulation board at all perimeters, openings and projections, with 100mm side laps and 150mm end laps.

3. Install Alumasc GTF Polyisocyanurate insulation (flat or tapered) fully bonded in hot bitumen, including upstands where appropriate. Boards must be tightly butt jointed and staggered. Suitable alternative insulations can be utilised where appropriate and compatible.

4. Install Derbigum Black or Mineral Cap Sheet, fully bonded in Derbibond cold adhesive, applied evenly by squeegee or spray gun. For maximum speed of installation, use the specialist block bonding pattern.

5. Note: Pre-cut the lower corner of the end of each roll at 45º where it will be overlapped by the end lap of the next roll.

6. Seal side laps (100mm) end laps (150mm) with a shoe burner torch. All laps must be pressure rolled with a 15kg long handled roller. A small (approx 5-10mm) continuous bead of compound must always visible at the joint.

7. All detail work to be executed in two layers, the first layer being Hi-Ten Universal, fully bonded in bitumen, followed by the cap sheet of Derbigum, fully bonded by torching. At all upstands install a 100 x 100mm reinforcement strip of Derbigum Black into the angle. The main sheet area must overlap onto the reinforcing strip by the full 100mm. Install a final flashing piece of Derbigum, fully bonded to the upstand and overlapping onto the main horizontal sheet area by a minimum of 100mm.

NB: Derbigum waterproofing systems are exclusively installed by a nationwide network of Derbigum Approved Contractors.

The company pursues a policy of constant product development and information contained in this publication is therefore subject to change without notice. The customer is responsible for ensuring that each product is fit for its intended purpose and that the conditions for use are suitable. All quoted data is nominal and subject to production tolerances.

System Componentsn Derbigum Black or Mineral Cap Sheet is a high

performance, APP modified bituminous membrane, with dual glass/polyester reinforcement, suitable for application in cold adhesive or by torch.

n Hi-Ten Universal is a polyester based underlay, suitable for bonding in hot bitumen (or by torching where appropriate), for use at the details and upstands only.

n Alumasc GTF is a CFC- and HCFC-free polyisocyanurate thermal insulation with plain glass-fibre tissue to both faces and is supplied in 600 by 1200mm boards and a range of thicknesses to suit the required thermal value.

n Nilperm is a polyester based high performance vapour barrier with an aluminium core, and is completely resistant to the passage of water vapour.

n Alumasc Bitumen Primer is a low viscosity, solvent-based bitumen primer intended to maximise the adhesion of bituminous membranes to metal and porous substrates.

Technical SupportAlumasc Technical Services provide an extensive project support service that includes site surveys, project specifications, performance calculations (e.g. U-values, condensation risk analysis), CAD detail drawings and general technical advice.

Contact Alumasc Technical Services via:

+44 (0) 1744 648400

waterproofing@alumasc-exteriors.co.uk

Online resources are available on our website or via the embedded links below:

Web Links

Brochures & Datasheets

NBS Specifications

CAD Drawings for typical details

www.alumascwaterproofing.co.uk