PMA-20

Langley PMA-20 Polymer Modified Asphalt Roofing System

The PMA-20, part of the Langley Paraphalt range, is a high performance, polymer modified asphalt (PMA), warm roof system for flat roofs. Paraphalt PMA is laid in the traditional way* with added durability and enhanced flexibility due to the rubber polymer modification. This system carries a 20 year independently insured guarantee for both materials and workmanship.

When to Specify

For new-build or refurbishment projects (where conditions allow, existing systems can be overlaid, avoiding costly strip-ups). Particularly suitable for roofs with multiple penetrations. Suitable for all roof decks (timber boarding requires a nailed attachment layer in accordance with BS 8747:2007).

(1) Reflective White Paint**

(2) Paraphalt Polymer Modified Asphalt, 20mm thick (2 x 10mm coats), 42.92kg/m².

(3) Sheathing Felt, 3mm thick, 1.9kg/m².

(4) Parafoam Ultra PIR Insulation Board*** 50-140mm (10mm increments), 140mm = 4.48kg/m².

(5) Parevapo SBS Metal Lined Vapour Control Layer, 3mm thick, 3.8kg/m².

(6) Concrete Deck.

Total System Weight based on 140mm Insulation board = 53.10 kg/m²

* In accordance BS 8218: 1998, BS 8000: Part 4: 1989, and the recommendations of the Mastic Asphalt Council.
** Note: Solar reflective finish is regarded as a maintenance item and must be renewed every 5 years.
*** Available as a tapered (cut to falls) option.

Durability

All the characteristics of traditional mastic asphalt but with the added benefit of a polymer modification, resulting in an extremely robust and durable covering with added flexibility. Heavy duty polyester composite metal lined vapour barrier provides a robust, watertight layer from the outset and peace of mind for both specifier and installer.

Resistance

Asphalt is completely protected from UV attack and mechanical damage etc. Monolithic seamless finish.

Lifespan

Long term solution, life expectancy in excess of 30 years.

Proven

Proven track record, mastic asphalt is one of the oldest waterproofing materials still in continuous use.

Guarantee

The system carries a 20 year independently insured guarantee for both materialand workmanship.
Can only be installed by approved MACCF contractors to ensure product quality is maintained.
A full range of accessories/supporting products are included under a single comprehensive guarantee, which includes: rooflights, refurbishment outlets, vents, lead-free flashings, edge trims etc.

Holistic Package

For users peace of mind, this system is 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.

The above information is issued in good faith and without warranty and is intended as a guide only. The information comprises typical data and does not constitute a specification.