Cost savings for installing a premium sustainable/singleply/PVC membrane system vs. traditional asphalt-based systems is two-fold: Because the premium PVC membrane systems actually encapsulate the roof, they can be installed directly over the existing structure, eliminating tear-off/removal, landfill waste costs and labor costs. Tear-off/removal of the existing roof can sometimes cost up to one and a half times the cost of the roof itself .
he PVC systems could cost up to 60 percent less than traditional asphalt- or rubber-based roof systems. The expected shelf-life of a traditional system is 50 percent less than a premium PVC membrane roof system, which can perform up to 20 years and beyond in some cases. There have been documented cases of systems that are still in place and still performing after 27 years, one of them in Houston.
Other advantages of PVC sustainable membrane systems include reduced energy consumption and costs. The high reflectivity and emissivity ratings of premium PVC systems mean that excessive heat is not absorbed into the rooftop itself but is deflected back into the atmosphere. Most “cool” rooftops will actually remain within 5 degrees of the ambient temperature, which reduces the workload on rooftop HVAC units as well, further reducing energy costs and virtually eliminating heat transfer to the roof deck and into chase areas which, in turn, maintains cooling of the return air process.
Additionally, toxins released from traditional asphalt or rubber roofing systems do not exist with the PVC membrane system. The pre-engineered sheets are heat welded together and (typically)
mechanically fastened to the roof deck. Labor costs for installing premium pre-engineered PVC membrane systems are typically less because of the greatly reduced amount of field welds (seams). This,