Modified bitumen and EPDM (ethylene propylene diene monomer) are some of the most popular types of commercial roofing. Like other roofing systems, however, they’re not without their problems. Shrinkage is among those issues, which, if not addressed promptly, can cause the roofing substrate to become exposed to moisture damage. Here’s a closer look at this common headache many property owners and facility managers face.
About Roof Shrinkage
Roof shrinkage refers to the shortening of the modified bitumen or EPDM membrane that covers the entire roofing system. Considering both roof type’s classification as “rubber” roofing, they’re prone to expanding and contracting due to temperature changes. Over time, the rate of expansion and contraction changes in such a way that the membrane no longer returns to its original condition. Once it shrinks, the roof tension increases, causing the flashing and fasteners to be pulled out and the membrane getting torn.
The Importance of Proper Installation
Avoiding shrinkage of your EPDM or modified bitumen roof starts with choosing the right roofing company. The pros you work with for your roof replacement project must ensure proper installation of either roofing system to alleviate problems in the long run, including thermal expansion and contraction. Commercial roofing contractors with manufacturer certifications can calculate the required spacing between membrane rolls and the amount of allowed slack.
If your roof is still years away from being replaced but is already showing signs of shrinkage, repairs can still be implemented as long as the damage isn’t severe. Patching small torn areas can be done using adhesives, while pulled fasteners and flashings can be replaced with new ones. Depending on the apparent cause, problems caused by shrinkage may be covered by your roofing warranty.
Fields Roof Service is the roofer you can trust for your commercial and residential roofing needs. We can guide you to durable, long-lasting options, including modified bitumen and single-ply roofing systems. We also offer roof coatings to extend the life span of your commercial roof. Call us today at (253) 852-4974 or fill out our contact form to request a quote.
