Why Roof Shrinkage Occurs in EPDM and Modified Bitumen Roofs

Shrinkage commonly occurs in ethylene propylene diene monomer (EPDM) and modified bitumen roofs. Preventing this problem can delay the need for a roof replacement. The issue mainly develops due to improper installation, natural aging of the material and prolonged exposure to harmful ultraviolet rays. 

Read on to learn what roof shrinkage is and why it happens in EPDM and modified bitumen roofs. 

What Is Roof Shrinkage?

A roof that is shrinking tends to pull the flashings at penetrations, walls, and curbs. It usually results in splits and cracks in the material that will lead to moisture penetration and leaks. The style and design of your roof can also increase the likelihood of shrinking. An experienced roofing contractor like Summit Roofing & Restoration, Inc. knows how to design a roof that will resist shrinkage.

How Do You Prevent It?

The best way to prevent your roof from shrinking is proper installation. Roofers must lay the material and let it rest for 45 minutes. During installation, they should alternate or stagger the end laps. Using ballast or coating can prevent UV rays from increasing the surface temperature of the membrane that causes shrinkage.

For affected areas of your roof, your contractor can replace any damaged flashing. They can relieve the pressure and pull by trimming the flashing, using a termination bar to secure the field sheet, and installing new flashing. Moreover, it may also help to have your roof checked regularly by a professional. With routine roof inspections, your contractor would be able to detect early signs of shrinkage and address them before the damage spreads. 

Need a roof repair or replacement? Turn to an experienced professional like Summit Roofing & Restoration, Inc. You can count on us for both your residential and commercial roofing needs. Give us a call at (731) 206-3821 (Dyersburg) or (901) 676-7449 (Atoka). You may also fill out our contact form to get a free quote.