Asphalt flat roofs are one of the best roofing materials for a flat roof and generally are considered to have a life of 30 to 40 years, that is assuming they are laid correctly and detailed correctly.
Problems that occur when asphalt roof deckings are not applied by professionals
One of the most important things with asphalt is to ensure that it sits on a firm decking.
We have found that asphalt tends to work best when sat on a concrete decking, whereas if it sits on a timber decking it can have some deflection, which leads to cracking and ultimately to dampness getting in the property.
No solar reflective paint
Some asphalt roofs have a solar reflective paint that is silver or white in colour. This does tend to throw the inexperienced person as to what the roof actually is. This is a paint applied over the top of the asphalt to help reduce damage from the sun’s rays.
Unfortunately, this can also hide problems unless you look carefully. Eurolay can provide you with an inspection service, you can contact us on Tel: 07913 359340
Exactly like a blister on your finger, blistering can occur to asphalt. If this is found it needs to be cut out and repaired, because again, exactly like a blister on your finger, it can burst and crack open and again ultimately allowing dampness into the property.
Stressed Crazing / Fatigue Lines
This occurs where the asphalt literally goes like a crocodile’s skin. You need to make sure that the stressed crazing is in the asphalt rather than in the paintwork. This needs to be cut out and repaired.
When water sits on asphalt roofs
Whilst an asphalt roof can withstand water sitting upon it probably longer than most types of flat roofs, it does ultimately start to damage it. The best feature of asphalt is that you can, to some extent, amend the detailing by applying further asphalt on top of the original.
Factors that may cause ponds on roofs:
+ Asphalt detailing around roof lights
+ Age of the Roof
+ Under Timber joists or under ply rotting.
As found that sometimes the asphalt detailing around roof lights can be a weak area, possibly because a roof light is literally an opening in the roof and may deflect slightly more than the rest of the roof, particularly if the water ponds around the roof light, which it often seems to do.
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