There are various completely different roof methods obtainable in at the moment’s market, every with numerous strengths and weaknesses. Beneath I’ll describe every system briefly, after which record the professionals and cons.
Thermoplastic and PVC- Single ply, might be mechanically hooked up, totally adhered or ballasted.
Professionals- Superior efficiency in ponding water conditions. Very light-weight roofs, within the neighborhood of 30lbs. per 100 sq. ft. Is available in white if a cool roof is desired, or in a number of completely different colours for aesthetic issues. One other plus with these roofs is that enormous customized made discipline sheets might be ordered from the manufacturing unit, minimizing seams sealed by the crew on the jobsite. Immune to ozone, algae and discipline seams are Three-Four instances stronger than EPDM filed seams. There’s additionally an incredible quantity of flexibility within the materials. And since seams might be welded with scorching air, there aren’t any noxious fumes to cope with. Each 15 and 20 yr warranties obtainable commercial roofing.
Cons- Being single ply, they’re susceptible to discarded cigarettes, sharp objects dropped on the membrane, and damaged glass from bottles thrown on roof (this occurs a LOT) I typically discourage clients from putting in all these methods if the roof has quite a lot of foot site visitors or is definitely accessible to unauthorized personnel. Up to now, materials shrinkage was at instances a extreme drawback on Thermoplastic and PVC roofs, however adjustments in composition and manufacturing has ameliorated this situation. These roofs nonetheless shrink over time, although to not the purpose of failure as prior to now.
Backside line- Nice roofs, particularly on roofs that pond water closely, so long as the roof is usually accessible solely to licensed personnel.
Asphalt Modified Bitumen- This roof is what lots of people name a rubber roof, when it’s in truth composed primarily of asphalt. It is available in Three ft. vast rolls and is normally torched down with an open flame, although they are often utilized with scorching air welders in sure circumstances as nicely.
Professionals- For my part, the most important energy of those roofs is how nicely they stand as much as exterior stresses. They deal with foot site visitors higher than some other membrane, and are tough to puncture, particularly if they’ve a granulated floor. These roofs are so powerful in truth, that almost all insurance coverage firms will not even acknowledge hail injury as they do on different roofs (I’ve personally seen modified roofs completely pummeled with hail and are available out fully undamaged)
Cons- Essentially the most obtrusive drawback with these methods is that there’s a seam each three ft, which makes for a LOT of seams. You probably have a diligent crew with a reliable foreman who will be sure that each seam on the roof is triple checked, you will most likely be superb with this technique. If not, you might be fairly certain you’ll find yourself with leaks pretty quickly, nicely earlier than the guarantee expires in my expertise. And huge ponding areas of water on these methods will degrade the fabric prematurely.
Backside line- With a very good, skilled crew this generally is a good roof on a constructing that doesn’t pond water excessively. And if in case you have a constructing with quite a lot of rooftop foot site visitors, that is most likely the one approach to go.
Foam roofs- This method is utilized with a big spray unit, spraying two liquid parts (isocyanate and resin) When the liquids are blended collectively, they increase 20-30 instances and can adhere to concrete, wooden, metal and most present roof methods, however in keeping with the producers, NOT to modified bitumen.
Professionals- When full, the roof is monolithic with no seams, totally adhered and has insulating properties.
Cons- Full disclosure, I’ve restricted expertise with these roofs right here in NE Illinois. We do not set up them, however I’ve been on 9-10 buildings with this technique, and all of them leaked badly, in a few instances inside months of being put in. Leaks are very tough to trace down and tough to repair even when discovered, as restore supplies do not adhere to this floor very nicely.
Backside line- Based mostly on my admittedly restricted expertise with this technique, I’d not advise my purchasers to go this route when a brand new roof is required.
EPDM Rubber- Rubber roofs might be totally adhered, mechanically fixed or weighed down with ballast (Riverbed gravel or pavers) They’re versatile, acceptable for a lot of installations and have an extended observe report.
Professionals- Rubber roofs are comparatively cheap, straightforward to put in and restore. They’re obtainable in giant sheets to attenuate the variety of discipline seams, and there’s fairly little bit of flexibility within the membrane.
Cons- Subject seams on these roofs will not be as robust as Thermoplastic roofs. Flashings and roof edges have a tendency to wear down extra rapidly than the rest of the roof. Shrinkage over lengthy durations might be dramatic in some functions.
Backside line- Generally is a good funding for a constructing proprietor, however all the circumstances of a given set up should be rigorously weighed. And good workmanship on the set up is significant.
Spray utilized roofing- These will not be technically re-roofs, they’re thought-about coatings. Some firms confer with them as “re-plys”, as you might be primarily including a ply to the prevailing roof floor. There are quite a few producers providing numerous merchandise with completely different compositions and specification, too quite a few to enter totally right here. If an present roof is experiencing leaks however has not superior to the purpose of outright failure, them could also be good candidates for this answer.
Professionals- Will be extraordinarily price efficient, particularly on roofs which have quite a lot of projections and rooftop HVAC items. The fabric is pure white, which in some instances (particularly on steel roofs) can dramatically cut back AC cooling prices. As that is thought-about to be roof repairs reasonably than a brand new roof, there are tax benefits as nicely.
Cons- The present roof should nonetheless be in considerably respectable situation. If utilized to a roof that has already failed, your cash will mainly be wasted. Additionally, since this materials is sprayed on, any vehicles inside 100 ft or so should be moved through the software course of, as this materials can be extraordinarily tough if not inconceivable to take away from a automobile’s end. Some producers don’t guarantee this materials if there’s ANY ponding water on the roof. Can’t be utilized to a roof with an present gravel ballast.