High performance specifications are now always recommended for built-up roofing and should completely displace lesser specifications from the market. Most high performance felts are made on a polyester fibre base which is more than strong enough for roofing purposes, and has a high elongation at break which exceeds all demands likely to be met in service. Past problems with built-up roofing, before the use of polyester, were almost all concerned with splitting of the membrane due to an inherent lack of strength. Such splitting is now a thing of the past, and split polyester base roofing specifications are practically unknown.
Polyester roofing has been in regular service for some 25 years and there appears to be no report of failure through ageing. Reported defects have been due to design faults or workmanship faults, for example at outlets or pipes Polyester felts were originally made with oxidised. bitumen coatings, but the majority are now made with modified bitumen coatings. These have further improved performance under test, and have improved handling characteristics on site, particularly in cold weather
The polyester itself is manufactured in one of two different methods which produce materials with differing characteristics. Needled polyester forms a relatively thick material with an open structure. Spun bonded material is more densely compacted, and tends to be stiffer and stronger. Both forms of polyester are equally suitable and roofing manufacturers make a choice to best suit there own process and economies and achieve a good balance of handling characteristics and performance on test. Relatively recent developments have included the introduction of polyester bases reinforced with glass fibre scrims to improve dimensional stability and tear resistance. Also laminates of polyester bases with glass fibre tissues and with aluminium foil to improve fire resistance. The addition of a polymer to the bitumen improves its properties as a roofing material in almost all respects, and in particular the flexibility, strength and fatigue resistance. Polymer modified bitumens are usually applied to a base of polyester or glass. The most commonly used modifying additives are SBS (styrene butadiene styrene) and APP (atactic polypropylene).
EPDM SINGLE PLY
Ethylene Propylene Diene Terpolymer (EPDM)
EPDM has excellent resistance to weathering, ultraviolet radiation, ozone thermal shock and cyclic fatigue. Use adhesive tape and talc-free types to minimise joint problems. Expected service life 20 to 30 years.
We have decided that out of all the single ply systems that this is the best suited for the private customer who really does not want a felt roof for what-ever reason.
S F Roofing can handle any roofing task and complete it to a high standard of workmanship.
All parts and prices will be subject to VAT
Prices will include travel to the job and the first hours labour. We take all major Debit & Credit Cards.
If you have a Roofing problem in Frome, send me an enquiry. I will contact you with my availability
If
you have any questions you think I could help you with just email me.
I will get back to you as soon as possible
Or call S F Roofing on:
01373 825573
07836 692394
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