spraying and installing spray foam roofing

How to Easily Raise Low Spots on a Commercial Roof?

Greg PalyaSilicone Roof Coatings, Spray Polyurethane Foam Roofing

Installing a spray foam roof is the easiest and most cost-effective way to raise low spots on a commercial roof.

There are two reasons why:

  1. The slope is easily manipulated by spraying more or less foam.
  2. You won’t have to piece together the membrane after the insulation is replaced

If you’ve never seen spray foam installed, please watch the video below:

Other commercial roofing systems, such as TPO, EPDM, and BUR, are flat. The slope of those systems is created using different heights of insulation board. This is called a “tapered system,” and it’s costly and time-consuming to create.

However, there is one issue: the roof is likely sagging due to wet insulation.

No roofing system, including spray foam, should be sprayed over wet insulation.

How to raise a low spot by installing a TPO, EPDM, or BUR roof:

  • Identify and remove wet insulation
  • Taper new insulation to provide adequate slope
  • Fasten membrane over new insulation
  • Piece together the membrane to the existing roof

How to raise a low spot by installing a spray foam roof:

  • Identify and remove wet insulation
  • Install new insulation with similar material
  • Install spray foam at the correct thickness to achieve proper slope

The difference?

The tapered system is labor-intensive and requires more time to install. With more roofing material to piece together, there’s more room for installer error.

Spray foam is self-adhering.

This means it’ll adhere to the new insulation and to the existing membrane seamlessly.

Using spray foam to raise lower roof areas is faster, easier, and more cost-effective for a building owner.

Here’s a photo of a roof with low spots:

Here’s a photo of the same roof after spray foam was installed:

What are your next steps?

Learn some more about spray foam.

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About the Author

Greg Palya

Greg Palya is the Digital Content Manager of West Roofing Systems, Inc. He has a B.S. in Marketing from the University of Akron and an MBA in Marketing from Walsh University. When he's not trying to teach others about spray foam roofing and silicone roof coatings, you can find him on the basketball court or golf course.