Home owners can pick among four types of flat roofs, states Bruce O’Neal, v . p . of Matthews Roofing, that has been keeping Chicago’s many flat roofs dry since 1934.
All types cost $250 to $350 per “square” (100 sq ft), but prices vary based on region and size the rooftop. Flat roofs usually include a ten- to twenty-year warranty however the roofs lasts twenty five years if correctly installed and maintained.
* Built-Up Roof (BUR)
The standard hot-tar-and-gravel roof is made from 3 or more plies of waterproof material alternated with hot tar and ballasted with a layer of smooth river stone. Once made from tar paper, these kinds of roofs progressively are utilizing more-advanced materials for example abs plastic membranes.
Pros: Gravel is a superb fire-proof. Attractive for home windows and decks that disregard the roof. It is the least expensive from the four roof types.
Cons: Very heavy. Joists sometimes need to be increased. Smelly and untidy to set up. Installation’s not suggested for occupied houses. It isn’t a DIY installation job, which is difficult to find the origin of leaks. Gravel can clog gutters and scuppers.
* Modified Bitumen
Just one-ply folded roof much like ice-and-water shield, but heavy-laden having a mineral-based put on surface. Torch-lower systems involve heating the adhesive because the material is unrolled. More recent peel-and-stick systems are safer and simpler.
Pros: Peel-and-stick material could be installed by home owners. Its light-colored mineral surface reflects warmth and cuts energy bills. Its cost is in the center of those.
Cons: Torch-lower application is really a fire hazard, and never suggested for occupied structures. It is not as scuff- or tear-resistant as rubber-membrane roofs (begin to see the next item).
* Rubber Membrane
EPDM (short for ethylene propylene diene monomer) is really a true rubber. The durable material resembles an inner tube, but it is designed to face up to damage from sunlight. EPDM could be robotically moored with nails, ballasted with stone, or glued.
Pros: Homeowner-friendly installation. The material’s relatively light yet highly resistant against scuffs and tears. Leaks are simple to patch.
Cons: The conventional black material soaks up warmth, and lightweight-colored films (suggested in warm environments) add 30% or even more towards the cost. The black version, though, is more expensive than BUR or modified bitumen. It is also more susceptible to punctures than other options.