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3 Types of Flat Roofs
Daniel Bracewell • 23 July 2021
If you’ve been thinking about adding an extension to your home, there are many design options available, but one important aspect is the roof.
There is much to consider when planning your home extension, including planning permission, for which the government is about to release new apps to simplify the process. Flat roofs are the popular option for the majority of extensions, and we look at the three types available.
The different types of flat roofs include built-up roofs (BUR), modified bitumen roofs (MBR), and EPDM rubber roofing installation. Flat roofs typically come with a 10 to 20-year warranty, but the right construction and maintenance can last more than 25 years.
1. Built-Up Roof (BUR)
This traditional hot-tar-and-gravel method is made up of three or more piles of waterproof material sandwiched with hot tar and ballasted by a layer of smooth stone. Once made from tar paper, now these roofs use more advanced materials, such as fibreglass membranes.
This is the cheapest option, and attractive, but is also very heavy, meaning joists need strengthening, and the process of installation is not recommended for occupied homes.
2. Modified Bitumen Roof
This is a single-ply rolled roof, that is impregnated with a mineral-based wear surface. As the material is unrolled, it is heated with a blow-torch to activate the adhesive.
Installation can pose a fire risk and is not as scuff or tear-resistant as rubber membrane roofs.
3. Rubber Membrane Roof
EPDM (short for ethylene propylene diene monomer) is a true rubber. The durable single-ply membrane material resembles an inner tube, but it's engineered to resist damage from sunlight. EPDM can be mechanically anchored with fasteners, ballasted with stone, or glued.
It is a relatively light material that is highly resistant to scuffs and tears, and any leaks are easier to patch. It is the more expensive of the three options, but also the one that will last the longest.
If you’re looking for EPDM flat roof specialists in Stockport, get in touch today
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