There are four types of asphalt roofing for flat roofs. The type you need depends on just how level your roof is. Dead level roofs, that are those with no deviation from one end to the other Type one is used, it is most similar to coal tar, the original covering of flat roofs. Type two is used on up to ½ inch slopes. Type three asphalt covers up to a two-inch slope. The final type is type four and useable on all other flat roofs. The drawback is the higher number your type is the shorter the lifespan. Meaning type four asphalt roofs will need replaced much sooner than a type one. Asphalt roofs are ‘repaired’ by seal coating, much as you would do a driveway.
Ethylene Propylene Diene Monomer (EPDM)
EPDM is a synthetic rubber that is increasing in popularity. It has had vapor issues in the past; however, a vapor barrier will prevent this. The current life span recorded is thirty years under warranty and the projected lifespan is fifty years. The lifespan is increasing every year due to the material not breaking down as fast as scientists assumed it would.
Turbo Seal is a self-heating gel that never cures, it is place on top of an existing tar or asphalt roof then capped with a sheet membrane. Some membranes require heat to set up properly while others are cold-set, meaning they will set on their own. Seams in the membrane are welded or sealed with a solvent.
PVC is another type of membrane roofing; it has heat-welded seams that are actually stronger than the actual membrane. This option comes in many colors, and can be custom ordered for an additional fee. This is an excellent choice; however, it is subject to plasticizer migration, which weakens the membrane over time. Thicker membranes last longer, but likewise cost more. An additional feature of this material is that it is fire resistant.
Vinyl roofs are inherently fire resistant, as well as repelling the sun in order to keep the building cooler in the summer. Ketone Ethylene Ester is a very similar product with a longer lifespan. Try to use Roofing Orland Park by all in roofs. Leading roofing company ir Orland Park (Illinois) region.
Thermoplastic Polyolefin (TPO)
TPO is single ply roofing; this is the most popular option for economically friendly constructions. It only comes in three colors. The formulation has changed many times over the years and there is no current lifespan or wear-and-tear ratings for this material. Testing in the real world is even less than under scientific means, therefore this material is very much at your own risk.
GRP roofing is applies over good quality wood, and then topped with edge trims and a coat of pigmented topcoat. The durability of this material has caused it to be used in tanks, automobiles, and underground pipes. It is chemical resistant, inexpensive, robust, and flexible, it will never corrode.
Lead, tin and copper are also used for flat roofs; however is a poor choice due to the cost as well as the vulnerability of being stolen and sold off as scrap metal.