There are many different roof systems available in today's market, each with different strengths and weaknesses. Listed below I will define each system briefly, then provide the disadvantages and pros.
Thermoplastic and PVC- Single ply, could be mechanically affixed, fully ballasted or adhered.
Very lightweight roofings, in the area of 30lbs. One more plus with these roof coverings is that big custom-made made field sheets can be ordered from the manufacturing facility, decreasing joints sealed by the crew on the jobsite. Resistant to ozone, field and algae seams are 3-4 times stronger than EPDM filed seams.
Disadvantages- Being solitary ply, they are at risk to thrown out cigarettes, sharp items dropped on the membrane layer, and broken glass from bottles thrown on roof (this takes place a LOT) I usually prevent consumers from mounting these sorts of systems if the roof has a lot of foot web traffic or is quickly obtainable to unapproved personnel. In the past, product shrinkage went to times a serious problem on Thermoplastic and PVC roofing systems, yet adjustments in make-up and production has actually alleviated this problem. These roofs still shrink gradually, though not to the point of failure as in the past.
Profits- Great roofings, specifically on roofing systems that pond water greatly, as long as the roof is typically easily accessible just to licensed employees.
Asphalt Modified Bitumen- This roof is what a lot of people call a rubber roof, when it remains in fact made up primarily of asphalt. It comes in 3 ft. broad rolls and is normally torched down with an open fire, though they could be used with warm air welders in specific problems.
Pros- In my point of view, the biggest toughness of these roofings is just how well they take on outdoors anxieties. They deal with foot traffic far better compared to other membrane layer, and are difficult to penetrate, specifically if they have a granulated surface area. These roofs are so challenging as a matter of fact, that a lot of insurance provider will not even acknowledge hailstorm damages as they do on various other roofs (I have directly seen changed roofs definitely pummeled with hail and appear entirely intact).
Disadvantages- The most glaring disadvantage with these systems is that there is a joint every 3 feet, which makes for a LOT of seams. If you have an attentive team with a competent supervisor that will make sure that every seam on the roof is three-way checked, you'll most likely be great with this system.
Bottom line- With a great, skilled staff this can be a great roof on a structure that does not pond water excessively. And if you have a building with a great deal of rooftop foot web traffic, this is possibly the only way to go.
Foam roofing systems- This system is applied with a huge spray unit, splashing 2 liquid elements (isocyanate and resin) When the liquids are blended together, they expand 20-30 times and will abide by concrete, wood, steel and most current roof systems, yet according to the makers, NOT to changed asphalt.
Pros- When complete, the roof is monolithic without any joints, totally adhered and has protecting residential properties.
Cons- Full disclosure, I have actually restricted experience with these roofings below in NE Illinois. We do not mount them, however I have actually been on 9-10 structures with this system, and all of them leaked terribly, in a couple of instances within months of being installed. Leaks are extremely difficult to track down and difficult to fix also when located, as repair materials don't comply with this surface area very 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 roofings could be fully adhered, mechanically fastened or weighed down with ballast (Riverbed gravel or pavers) They are flexible, ideal for many installments and have a long record.
Pros- Rubber roofing systems are fairly cost-effective, very easy to fix and set up. They are offered in large sheets to minimize the variety of area joints, and there is quite bit of versatility in the membrane.
Disadvantages- Field joints on these roofings are not as strong as Thermoplastic roof coverings. Flashings and roof sides tend to wear out faster than the rest of the roof. Contraction over long periods could be dramatic in some applications.
Bottom line- Can be a great investment for a structure owner, however all of the conditions of an offered installation has to be carefully evaluated. And great handiwork on the set up is vital.
Spray applied roofing- These are not technically re-roofs, they are thought about finishings. Some business describe them as "re-plys", as you are essentially including a ply to the existing roof surface area. There many suppliers providing numerous items with various compositions and specification, also numerous to go into totally below. Them could be great candidates for this option if an existing roof is experiencing leakages but has not advanced to the point of outright failure.
Pros- Can be extremely economical, especially on roofs that have a lot of projections and rooftop HVAC units. The material is pure white, which in many cases (specifically on steel roof coverings) could dramatically decrease A/C air conditioning expenses. As this is thought about to be roof repair services rather compared to a brand-new roof, there are tax advantages.
Disadvantages- The existing roof must still be in somewhat suitable problem. If put on a roof that has actually currently stopped working, your cash will essentially be wasted. Likewise, since this material is splashed on, any type of cars within 100 ft approximately need to be moved throughout the application process, as this product will be incredibly difficult if not difficult to eliminate from a car's coating. Some producers do not warranty this product if there is ANY ponding water on the roof. Can not be related to a roof with an existing gravel ballast.
Bottom line- This option could save a building proprietor a great deal of money, if the existing roof is in sufficient condition to accept the layer. Outstanding option for steel roofing systems specifically.
As you can see, there are many different options to your level roofing demands. It is vital however to select a roofer who will certainly advise the most effective system for your certain roof and circumstances, and not the best service for here his budget. Make sure you recognize why a roofer is advising a certain system for your task, and which system will be the very best financial investment for you.
Disadvantages- Being single ply, they are susceptible to discarded cigarettes, sharp things dropped on the membrane, and busted glass from bottles thrown on roof (this happens a LOT) I generally discourage consumers from installing these types of systems if the roof has a great deal of foot web traffic or is quickly obtainable to unapproved workers. These roof coverings are so hard in truth, that many insurance companies will not even recognize hail damages as they do on other roofs (I have actually directly seen modified roofs definitely pounded with hail and come out entirely intact).
Disadvantages- Field seams on these roofs are not as solid as Thermoplastic roof coverings. Flashings and roof sides tend to put on out a lot more rapidly compared to the remainder of the roof. As this is taken into consideration to be roof repair work rather than a brand-new roof, there are tax benefits.