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Fibre Glass has a life expectancy of at least 30 years.
Use of an overlay system would be dependent on the condition of your existing roof, we are happy to carry out a site survey and provide a free appraisal and estimate. You should consult your Local Authority concerning planning permission, if you have a leasehold you may also require the consent of the Freeholder. In all other respects we are happy to carry out a site survey and provide a free appraisal and estimate. This will depend to a large extent on the size of your roof and the work required, however the average residential flat roof can be completed within a few days. A cold roof has its insulation in-between the roof rafters leaving an air gap between the insulation and the roof covering, this air gap must be ventilated at the eaves. The insulation is closest to the warm surface indoors with an air gap between the warm air indoors and the cold air outdoors. A cold roof is now considered out dated. A warm roof has its insulation fixed on top of the roof rafters, a water proof covering is then applied on top of the insulation.The roof air gap does not need to be ventilated, the insulation is closest to the cold air outside providing a warm barrier between the warm air inside and the cold air outside. Because of this a warm roof is considered the best way to control condensation and insulate a roof. Basically a green roof is a roof that is designed to take a covering of vegetation. Liquid roofing refers to various systems that use liquids such as resins, polyester, polyurethane, and other liquid coatings to form a water tight membrane on a roof surface. The big advantage of liquid systems is that a seamless covering can be obtained and otherwise difficult details around pipes and other obstacles protruding through the roof are easily made watertight. Glass Resin Plastic ( GRP ) otherwise known as Fibre Glass. These systems are polyester based. There is no difference, Fibre Glass is the most common term for GRP most people have some understanding of Fibre Glass but are un-familiar with the term GRP. These are normally bitumen based coatings with aluminium incorporated into them, these coatings are applied to bitumen roofs to act as a solar reflective barrier against sunlight. Torch-on felt, refers to a system for applying felt & bitumen to a flat roof.
Bitumen on the back of the felt known as modified bitumen is heated up using a gas burner, the flame is applied directly to felt and the roof surface so as to melt the bitumen and form a bond between the roof surface and the felt.
Becoming less popular, there have been a number of high profile instances where roofs and buildings have caught fire using this method. Refers to the traditional method for applying felt & bitumen to a roof surface, a method that is becoming less popular due to the dangers involved, Bitumen known as blown bitumen is boiled in a furnace, it is then carried boiling in buckets to the roof area and poured as the felt is rolled out forming a bond between the felt and roof surface. Refers to any any method where felt and bitumen is laid on a roof surface to build up the required number of layers, normally three. |
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