Asphalt Roofing Specification

What is Mastic Asphalt?

Mastic Asphalt is a highly super versatile construction material used for a whole range of production projects, both new build and refurbishment projects, where a easy, seamless, long lasting finish is needed. It offers overall waterproofing for roofing and tanking and acts as a hard deck surface in flooring and paving. If nicely designed and laid it have to be capable of lasting 50-60 years. In addition to this, it's also fully recyclable.

CONTROL OF WATER VAPOUR

Any provision required to govern interstitial condensation in the roof need to be decided as advocated in BS 6229:1982 but with calculation method modified to conform to BS 5250:1989 (1995).

WARM DECK ROOFS ATTACHMENT OF THERMAL INSULATION BOARDS

The boards must be bedded in hot bitumen to the vapour control layer with joints close butted and move joints staggered. An fair margin should be provided among insulation slabs and all skirtings and abutments to allow for an infill.

MASTIC ASPHALT ROOFING

GENERAL

The variety of coats need to be suitable to the waterproofing necessities and traffic situations of the roof. When laid to falls of 1:eighty or extra mastic asphalt roofing is laid in two coats to a thickness of 20mm, all in accordance with BS 8218:1998.

In which falls are less than 1:80 or a ‘buried’ specification is required, 3 layers of mastic asphalt to a total thickness of 30mm ought to be implemented.

SLOPING, HORIZONTAL & VERTICAL SURFACES HORIZONTAL SURFACES AS MUCH AS AND CONSISTING OF 10˚ PITCH

On horizontal surfaces as much as and which includes 10˚ pitch the mastic asphalt ought to be laid in two coats to a thickness of 20mm on a setting apart membrane of sheathing felt.

Difficulties can may be noted in laying mastic asphalt at once over insulants to surfaces over five˚ pitch.

SLOPING AND VERTICAL SURFACES OVER 10˚ PITCH, TIMBER OR LIGHT-WEIGHT CONCRETE AND SKIRTINGS

On sloping and vertical surfaces over 10˚ pitch the mastic asphalt need to be laid in three coats to a thickness of 20mm with out a isolating membrane. On sloping and vertical surfaces of timber or lightweight concrete the mastic asphalt should be laid in three coats to a thickness of 20mm on expanded metal lathing over a separating membrane of sheathing felt.

HORIZONTAL SURFACES DESIGNED AS ROOF GARDENS, RESERVOIRS OR BURIED WATERPROOFING

Horizontal surfaces when designed as a roof lawn, reservoirs or as a buried waterproofing membrane, the mastic asphalt is laid in three coats to a thickness of 30mm over a setting apart membrane of grp tissue.

ROOFING

MASTIC ASPHALT VAPOUR BARRIER

A mastic asphalt vapour barrier should be laid in a single coat no less than 10mm thick on a grp tissue.

SKIRTINGS AND UPSTANDS

SKIRTINGS AND UPSTANDS APART FROM WOOD OR LIGHT-WEIGHT CONCRETE

On skirtings and upstands as much as 300mm high the mastic asphalt ought to be carried out in coats to a thickness of 13mm.

On skirtings and upstands over 300mm high the mastic asphalt should be carried out in 3 coats to a thickness of 20mm.

Note: two coat work may be permissible to vertical upstands in extra of 300mm in areas no longer exposed to the factors including tank rooms, mechanical services regions etc. In which the arrival of the completed paintings is not of paramount significance.

SKIRTINGS AND UPSTANDS OF WOODEN OR LIGHT-WEIGHT CONCRETE

On skirtings and upstands of timber or light-weight concrete the mastic asphalt have to be implemented in 3 coats to a thickness of 20mm, on elevated steel lathing over a isolating membrane of black sheathing felt.

SKIRTINGS AND UPSTANDS ON INCREASED METAL LATHING TO CONCRETE, BRICK OR BLOCKWORK

In sure situations it could be vital to comprise extended metallic lathing to concrete, brickwork or blockwork. In those situations the mastic asphalt ought to be carried out in three coats to a thickness of 20mm along with a separating membrane of sheathing felt, where required.

PROTECTION OF THE SURFACE

INFORMATION

All asphalt roofing, along with upstands, need to be protected towards static factor loading and mechanical harm. On inverted roofs, the ballast and insulation will offer protection to the mastic asphalt. The insulation and ballasting should be set up at once on crowning glory of the laying of the mastic asphalt or as soon as is almost viable. Care ought to be taken to offer adequate safety at upstands.

RUBBING SAND

On horizontal and barely sloping surfaces, without delay after completion of laying and while the mastic asphalt continues to be heat, clean sharp sand must be rubbed frivolously into the surface of the mastic asphalt with a wooden glide

Fully Approved Mastic Asphalt Contractors

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approved-fairtrades
approved-confederation-of-roofing
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approved-cscs
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approved-construction-line
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approved-trust-mark
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approved-shield-membranes
approved-fairtrades

Heritage Asphalt Ratings

What our Customers say about our Work

“I found Heritage Asphalt by accident on the Internet. It was a video about asphalting steps. I called Ryun who was very professional and had a great deal of experience and knowledge. The job was booked in straightaway and a team set about taking off old asphalt rebuilding and repairing the big Victorian staircase and then asphalting. The finish was quite amazing, these guys are very skillful at what they do and My husband and I were delighted. They were a professional team really hard working and highly recommend them.” Customer in London

“First class job - very polite. Couldn't have chosen better - highly recommend this company. Thank you.” Mrs Susan Knight

“Perfect service. Will happy use them again if required to.” Trevor Trim

“This company goes 'the extra mile' in both workmanship, customer satisfaction and consideration.” Mrs A Lighterness

“Ryan and team arrived, late afternoon, as agreed, to review balcony, approx. 25m2, 3 sides fed by tiled roof and one long length hand-rail. Problem, 3 leaks in different places from 10yr old asphalt roof. We discussed the problem and Ryun suggested a choice of two plan of action. We found his quotation very acceptable. This work was completed as agreed, in only a few days, to our complete satisfaction. Eight months after completion, I can now report that after a very wet winter, the roof is in a sound state. An excellent job done.” Customer in Cambridge