Langley HM-40 Paratech Hot Melt Waterproofing System
Verified by manufacturer 4 months ago
BBA Agrément Certificate
Certificate type
HM-40 is a monolithic, hot-melt bitumen waterproofing system for protected, inverted roofs, terraces, podium decks, and green roofs. Offering a 30-year independent insurance backed guarantee.
Application
Suitable for use in new build projects, where a protected membrane or green roof system is required, including:
- Flat roofs (including 'zero falls');
- Protected roofs;
- Green roofs;
- Terraces;
- Podium decks.
Primarily used for concrete substrates, but can also be used on plywood and for a warm (inverted) or cold roof configuration. Protection can be either in the form of polystyrene insulation (warm roof), round washed pebbles, paving/ podium or a green roof system.
Applied via fully-bonded, hot-melt application.
Description
A monolithic, elastomeric hot-melt bitumen waterproofing system designed for use on protected, inverted roofs, green roofs, terraces, and podium decks. The HM-40 system is fully bonded and provides a continuous waterproofing layer.
Features and Benefits:
- Single-application, hot-melt installation for efficient coverage of large areas.
- 30-year independent insurance backed guarantee or a 40-year product only warranty
- Reinforced with coated glass mesh
- Root-resistant when specified with Graviflex (HM) cap sheet for green roof applications.
- Elastomeric properties designed to accommodate structural movement.
- Fire performance: Suitable for use under National Building Regulations when covered with ballast, paving, or specified green roof systems.
- BBA certified (15/5276) and compliant with NHBC Technical Standards Chapter 7.1.
- Inverted systems are available.
Supported by the full Langley package that includes: surveys, condition reports and proposals, specifications, site monitoring and reporting, technical and design advice, guarantee inspections, all at no additional cost.
General information
Color | Grey |
Finish | Textured |
Material | Bitumen |
Length | Bespoke |
Width | Bespoke |
Height | Bespoke |
Warranty description | 30 year Guidance for specification option: 30 year independent insurance backed guarantee. Manufacturer guidanceLangley roofing systems are supplied with a genuine 30‑year independent insurance‑backed guarantee (IBG), providing both system assurance and financial protection for the building owner. The IBG covers the installed system in the event of a design failure, poor workmanship, a fault in the system or faulty materials, and remains valid even if the installing contractor or Langley were to cease trading. Issued directly to the building owner on completion, it acts as an additional, independent layer of financial protection and supports access to government funding schemes where an IBG is required.
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Uniclass | |
CAWS | J41/110 Built-up reinforced bitumen membrane warm deck roof covering J41/12 Reinforced bitumen membrane cold deck roof covering J41/120 Built-up reinforced bitumen membrane inverted roof covering J41/130 Built-up reinforced bitumen membrane cold deck roof covering |
SKU Code | HM-40 |
Product range |
Specification data - Hot-applied polymer-modified bitumen waterproof coatings
Classification data | |
Colour | Dark grey. |
Horizontal work | Langley Primer (HM). |
Preparation Skirtings And Vertical Work | Langley Primer (HM). |
First layer | Paratech R Reinforcement (0.11 kg/m²). |
Intermediate layer | Paratech HM (3–5 kg/m²). |
Top layer | Paradiene 35 SR4 HM or Graviflex (HM), (4.4–4.6 kg/m²). |
Surface protection | Graviflex (HM). Paradiene 35 SR4 (HM). |
Weight | 7.51–9.71 kg/m². |
Elongation | 40 x 45% (maximum). Guidance for specification option: To BS EN 12311-1. |
Impact resistance | 1000 mm. Guidance for specification option: To EN 12691-A. |
Puncture resistance | 20 kg. Guidance for specification option: Static puncture resistance (to EN 12730-B). |
TensileStrength | 700 x 550 N/50 mm. Guidance for specification option: (to BS EN 12311-1). |
Overall thickness | 7–8 mm (approximately). |
Sustainability data
Material | Bitumen |
BIM objects
This BIM object has been authored to meet the requirements of the
Find out more about the
| Platform | Compatible | Version |
|---|---|---|
 Revit | - | 2 |
 IFC | - | 2 |
Product certifications
BBA Agrément Certificate
Paratech BBA
Literature
HM-40 Paratech Hot-Melt Waterproofing System
Case studies
Blackhorse Lane