There are several roof systems available in today's market, each with numerous strengths and weak points. Below I will define each system briefly, and after that detail the advantages and disadvantages.
Thermoplastic and PVC- Single ply, can be mechanically connected, totally adhered or ballasted.
Pros- Superior efficiency in ponding water situations. Extremely lightweight roof coverings, in the area of 30lbs. each 100 sq. ft. Comes in white if an awesome roof is wanted, or in a number of different shades for aesthetic worries. Another plus with these roofs is that big customizeded field sheets can be bought from the manufacturing facility, minimizing seams sealed by the team on the jobsite. Resistant to area, ozone and algae joints are 3-4 times more powerful than EPDM submitted seams. There is also an incredible quantity of versatility in the product. And given that seams could be bonded with warm air, there are no toxic fumes to manage. Both 15 and 20 year service warranties readily available.
Cons- Being solitary ply, they are prone to disposed of cigarettes, sharp objects went down on the membrane, and broken glass from containers tossed on roof (this happens a LOT) I generally inhibit clients from setting up these types of systems if the roof has a great deal of foot web traffic or is easily available to unapproved workers. In the past, material contraction was at times an extreme issue on Thermoplastic and PVC roofs, yet adjustments in structure and manufacturing has actually relieved this issue. These roofs still diminish over time, though not to the factor of failure as in the past.
Bottom line- Great roofs, particularly on roofing systems that pond water heavily, as long as the roof is generally obtainable only to accredited personnel.
Asphalt Modified Bitumen- This roof is exactly what a great deal of people call a rubber roof, when it is in reality composed primarily of asphalt. It comes in 3 ft. large rolls and is usually torched down with an open flame, though they can be used with warm air welders in certain conditions.
Pros- In my viewpoint, the largest strength of these roofing systems is exactly how well they take on outdoors stresses. They deal with foot web traffic far better compared to other membrane layer, and are difficult to puncture, particularly if they have a granulated surface. These roofings are so hard actually, that the majority of insurance companies won't even recognize hail damages as they do on various other roofs (I have actually directly seen modified roofings definitely pounded with hailstorm and come out totally undamaged).
Cons- The most obvious drawback with these systems is that there is a joint every three feet, that makes for a LOT of seams. If you have an attentive crew with an experienced supervisor who will ensure that every joint on the roof is three-way inspected, you'll possibly be fine with this system. If not, you could be rather sure you will end up with leakages fairly quickly, well before the warranty runs out in my experience. And big ponding locations of water on these systems will break down the material too soon.
Bottom line- With an excellent, skilled staff this can be a great roof on a structure that does not pond water excessively. And if you have a structure with a lot of roof foot web traffic, this is possibly the only way to go.
Foam roofings- This system is used with a large spray system, splashing two liquid parts (isocyanate and resin) When the fluids are mixed together, they increase 20-30 times and will certainly adhere to concrete, wood, steel and most present roof systems, yet according to the makers, NOT to customized asphalt.
Pros- When total, the roof is monolithic without seams, completely stuck and has shielding properties.
Cons- Full disclosure, I have restricted experience with these roofs below in NE Illinois. We do not mount them, however I have actually gotten on 9-10 structures with this system, and all of them dripped severely, in a couple of situations within months of being set up. Leaks are very hard to locate and difficult to take care of also when located, as repair materials do not adhere to this surface extremely well.
Bottom line- Based on my admittedly limited experience with this system, I would not advise my customers to go this course when a brand-new roof is required.
EPDM Rubber- Rubber roofs can be fully stuck, mechanically considered or secured down with ballast (Riverbed gravel or pavers) They are functional, ideal for several setups and have a long record.
Pros- Rubber roofs are fairly low-cost, simple to fix and install. They are available in huge sheets to reduce the number of area seams, and there is fairly little bit of versatility in the membrane layer.
Disadvantages- Field joints on these roofing systems are not as strong as Thermoplastic roof coverings. Flashings and roof edges have the tendency to wear more quickly compared to the remainder of the roof. Contraction over long periods could be remarkable in some applications.
Profits- Can be a great investment for a structure owner, but all the circumstances of an offered installation has to be thoroughly considered. And good handiwork on the install is essential.
Spray applied roofing- These are not practically re-roofs, they are considered finishes. Some companies describe them as "re-plys", as you are essentially including a ply to the existing roof surface area. There are numerous makers offering different items with various compositions and spec, also various to enter into totally here. Them website may be great candidates for this option if an existing roof is experiencing leakages yet has not advanced to the point of outright failing.
Pros- Can be incredibly affordable, particularly on roofings that have a great deal of estimates and rooftop HVAC units. The material is pure white, which in many cases (specifically on metal roofs) can considerably minimize A/C air conditioning prices. As this is thought about to be roof repair services instead compared to a brand-new roof, there are tax obligation benefits.
Disadvantages- The existing roof should still remain in rather decent condition. If related to a roof that has currently stopped working, your cash will basically be squandered. Likewise, considering that this material is sprayed on, any kind of cars within 100 feet or two must be moved during the application procedure, as this material will certainly be incredibly challenging otherwise difficult to eliminate from a car's finish. Some producers do not service warranty this material if there is ANY ponding water on the roof. Could not be applied to a roof with an existing crushed rock ballast.
Bottom line- This service may save a structure proprietor a great deal of money, if the existing roof is in adequate condition to accept the finish. Outstanding solution for metal roof coverings specifically.
As you could see, there are various remedies to your flat roofing requirements. It is crucial nonetheless to choose a roofer that will certainly recommend the most effective system for your particular roof and circumstances, and not the very best option for his wallet. Make certain you recognize why a roofer is suggesting a certain system for your job, and which system will be the most effective investment for you.
Cons- Being solitary ply, they are vulnerable to thrown out cigarettes, sharp objects went down on the membrane, and damaged glass from containers thrown on roof (this occurs a LOT) I generally prevent consumers from setting up these kinds of systems if the roof has a whole lot of foot website traffic or is conveniently accessible to unauthorized employees. These roofs are so tough in truth, that the majority of insurance firms won't also recognize hail damage as they do on other roof coverings (I have directly seen changed roof coverings absolutely pummeled with hail storm and come out entirely intact).
Cons- Field seams on these roofings are not as solid as Thermoplastic roofing systems. Flashings and roof sides have a tendency to use out much more rapidly compared to the rest of the roof. As this is considered to be roof repairs instead compared to a brand-new roof, there are tax advantages.