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There are actually various roof devices offered in today's market, each along with a variety of strengths as well as weak points. Listed below I will describe each body briefly, and after that specify the advantages and disadvantages.

Thermoplastic and also PVC- Single ply, can be mechanically affixed, fully stuck or ballasted.

Pros- Top-notch functionality in ponding water scenarios. Quite light in weight roofs, in the neighborhood of 30lbs. every one hundred sq. ft. Comes in white if an amazing roof is actually desired, or in a number of different colours for aesthetic issues. One more plus along with these rooftops is that big custom made area pieces may be ordered from the manufacturing facility, lessening joints closed due to the team on the jobsite. Insusceptible to ozone, algae and also industry joints are actually 3-4 times more powerful than EPDM submitted joints. There is actually also an incredible quantity of adaptability in the material. And considering that joints can be bonded with hot air, there are no unhealthy fumes to take care of. Each 15 and twenty years service warranties on call.

Disadvantages- Being solitary ply, they are prone to thrown out cigarettes, sharp objects went down on the membrane, as well as busted glass coming from bottles thrown on roof (this happens a LOT) I generally discourage clients coming from putting in these sorts of units if the roof possesses a lot of foot web traffic or is quickly available to unwarranted employees. Before, product shrinking went to times a severe concern on Thermoplastic and also PVC roofs, but adjustments in composition and manufacturing has actually alleviated this problem. These roofings still diminish gradually, though not to the point of failing as before.

Income- Excellent roof coverings, particularly on roof coverings that pond water intensely, just as long as the roof is actually usually easily accessible merely to accredited employees.

Asphalt Adjusted Bitumen- This roof is what a bunch of individuals contact a rubber roof, when it is in fact comprised mostly of asphalt. It can be found in 3 ft. large rolls as well as is typically torched down with an open blaze, though they may be used with hot air welders in specific ailments too.

Pros- In my viewpoint, the biggest stamina of these roofings is how properly they stand up to outside worries. They take care of feet visitor traffic far better than every other membrane, as well as are challenging to puncture, specifically if they possess a granulated area. These rooftops are actually therefore tough in fact, that the majority of insurance companies will not also identify hailstorm damage as they carry out on various other rooftops (I have actually directly seen modified rooftops positively pummeled with hail and come out fully undamaged).

Cons- The most obvious negative aspect along with these devices is actually that there is actually a joint every 3 feet, that makes for a TON OF joints. If you have a persistent team with a proficient foreman who will ensure that every joint on the roof is actually three-way examined, you'll possibly be great using this body. If not, you can be pretty sure you will end up with leaks fairly soon, well before the warranty expires in my experience. And large ponding areas of water on these systems will degrade the material prematurely.

Bottom line- With a good, experienced crew this can be a good roof on a building that does not pond water excessively. And if you have a building with a lot of rooftop foot traffic, this is probably the only way to go.

Foam roofs- This system is applied with a large spray unit, spraying two liquid components (isocyanate and resin) When the liquids are mixed together, they expand 20-30 times and will adhere to concrete, wood, steel and most existing roof systems, but according to the manufacturers, NOT to modified bitumen.

Pros- When complete, the roof is monolithic with no seams, fully adhered and has insulating properties.

Cons- Full disclosure, I have limited experience with these roofs here in NE Illinois. We don't install them, but I have been on 9-10 buildings with this system, and all of them leaked badly, in a couple of cases within months of being installed. Leaks are very difficult to track down and difficult to fix even when found, as repair materials don't adhere to this surface very well.

Bottom line- Based on my admittedly limited experience with this system, I would not advise my clients to go this route when a new roof is needed.

EPDM Rubber- Rubber roofs can be fully adhered, mechanically fastened or weighed down with ballast (Riverbed gravel or pavers) They are versatile, appropriate for many installations and have a long track record.

Pros- Rubber roofs are relatively inexpensive, easy to install and repair. They are available in large sheets to minimize the number of field seams, and there is quite bit of flexibility in the membrane.

Cons- Field seams on these roofs are not as strong as Thermoplastic roofs. Flashings and roof edges tend to wear out more quickly than the remainder of the roof. Shrinkage over long periods can be dramatic in some applications.

Bottom line- Can be a click here good investment for a building owner, but all of the circumstances of a given installation must be carefully weighed. And good workmanship on the install is vital.

Spray applied roofing- These are not technically re-roofs, they are considered coatings. Some companies refer to them as "re-plys", as you are essentially adding a ply to the existing roof surface. There are numerous manufacturers offering various products with different compositions and specification, too numerous to go into fully here. If an existing roof is experiencing leaks but has not advanced to the point of outright failure, them may be good candidates for this solution.

Pros- Can be extremely cost effective, especially on roofs that have a lot of projections and rooftop HVAC units. The material is pure white, which in some cases (especially on metal roofs) can dramatically reduce AC cooling costs. As this is considered to be roof repairs rather than a new roof, there are tax advantages as well.

Cons- The existing roof must still be in somewhat decent condition. If applied to a roof that has already failed, your money will basically be wasted. Also, since this material is sprayed on, any cars within 100 ft or so must be moved during the application process, as this material will be extremely difficult if not impossible to remove from a car's finish. Some manufacturers do not warranty this material if there is ANY ponding water on the roof. Can not be applied to a roof with an existing gravel ballast.

Bottom line- This solution may save a building owner a lot of money, if the existing roof is in good enough condition to accept the coating. Excellent solution for metal roofs in particular.

As you can see, there are many different solutions to your flat roofing needs. It is vital however to choose a roofer who will recommend the best system for your particular roof and circumstances, and not the best solution for his wallet. Be sure you understand why a roofer is recommending a particular system for your project, and which system will be the best investment for you.