Bristol Asphalt Roofing

Here at Bristol Roofing Company, we are the specialists in professionally installing asphalt roofing and you can rely on us for expert installation at affordable prices.

Asphalt is very versatile and can be applied to a variety of different surfaces, such as timber and concrete, as well as insulated metal decks and stairways. Applying asphalt effectively combines a water tight solution with a quality finish. Our highly skilled asphalt spreaders learn their trade from long apprenticeships and years of hands on experience, under highly skilled supervision. So you can be sure that when they apply mastic asphalt to any surface it will form a seamless and continuous waterproof covering. We pride ourselves on delivering a top class, reliable, convenient service. We provide free quotes and conduct free surveys. So if you are looking for Bristol Roofers then

call May Roofing Company today!
0117 370 1850



Mastic Asphalt Information

Over the years bitumen impregnated limestone was used to create natural rock asphalt which was seen as a high performance mastic asphalt and used until the late 1970s. This has been replaced by today's high performance 'polymer-modified' products. Mastic asphalt is a mixture of an inert mineral aggregate and an asphaltic cement According to the Building Research Establishment mastic asphalt can have a life expectancy of 50 years or more. This is, however, based solely on cold deck roofs which are correctly installed and properly maintained. The traditional warm-decked roof focuses the solar gain into the waterproofing, which can lead to far quicker breakdown of mastic asphalt roofs



Principal Faults



1. Surface Imperfections
Crazing on the surface of the asphalt, i.e. surface cracks which do not penetrate the asphalt for more than a few millimetres. Haphazard in direction.

Causes:
(a) Dressing sand not rubbed in with a wooden float while the asphalt is still warm on application
(b) The absence/failure of a solar reflective treatment solutionfor a warm roof construction.

Remedies:
Generally no remedial measures are necessary due to the superficial nature of the cracks. If the surface is aesthetically unacceptable then the simplest solution is to remove the whole of the asphalt surface or the affected area if the roof is large and re-lay.
To prevent further surface imperfections, then the causes should be examined and remedied. An application of a solar reflective treatment may be suitable.
Overlaying with a polyester-reinforced 'torch-on' RBM, will provide further waterproofing and added solar protection and is worth considering.


2. Cracking
Fissures in the asphalt which penetrate the thickness a significant amount in excess of 2-3mm
Causes:
Differential movement either of the asphalt surface (e.g. around openings or changes in plan shape or material), between the asphalt and its substructure or between the asphalt and its coverings (e.g. bonded paving slabs not fixed with an isolating membrane).

Remedies:
If water penetration has occurred then not only must the defect be corrected but also the condition of the substructure should be investigated. The crack itself may be easily dealt with by patch repairing, but should significant deterioration have occurred to the substructure and/or insulation, then significant areas may have to be exposed. Cutting out defective areas, cracks, stress features or cutting to line between new and existing asphalt may be carried out with an electrical or mechanical cutter. If it is necessary to remove an area of mastic asphalt, the lines of the cuts should be covered with molten mastic asphalt until the under laying material has softened. The asphalt should not be removed until this has taken place. All repairs should be carried out adopting the warm, clean and join process. In no circumstances should a hammer and chisel be used to cut cold mastic asphalt. The cut edge of the existing mastic asphalt should be softened using molten mastic asphalt and removed to half its depth for a width of approximately 75mm. A proper lapped joint with the re-laid mastic asphalt can then be formed. Consideration should be given to overlaying with a polyester-reinforced 'torch-on' RBM, to provide further waterproofing security and added solar protection.


3.Distortion
Rippling, creeping and sagging are the usual signs.

Causes:
Usually caused by differential thermal movementeither of the asphalt, its substructure or a combination of both. A distorted surface will not in itself lead to water penetration although it may eventually fail if cracks should occur.
The absence of a solar reflective finish in a warm roof construction will substantially increase the probability of distortion occurring.

Remedies:
Depending upon the severity of the problem no action may be required in minor cases and in non-critical locations. The application of a solar reflective finish may be used whilst patch repairs may be necessary in other circumstances. Full replacement of the surface may be required if the area of distortion and cracking is significant in relation to the size of the roof or if major remedial works to the roof structure are required.









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