Installing TPO & PVC roofing membrane: Cost & process comparison

Your roof is one of the most vital elements of a commercial building. Installing the wrong parts or using solutions that don’t pair well can cause your roof to deteriorate faster or lead to safety hazards. Membranes are one of the critical parts to consider — both the material used and the installation method employed.

When it comes to roofing membrane material, TPO and PVC are two popular options. While they share a number of similarities, there also exist key distinctions that may make one type more appropriate for  your roofing project. This article will explore TPO vs PVC roofing membranes by weighing the pros and cons of each, along with comparing costs and installation processes.

Do PVC and TPO installation processes vary?

PVC and TPO membranes can be installed in similar ways, thoughTPO is slightly more challenging to install due to its reduced flexibility. Both membranes can be installed in hot asphalt, mechanically attached, adhered with cold adhesive, or induction welded. Additionally, both allow for hot air weld seams, patches, and details.

Our isoweld® induction welding equipment provides an all-in-one installation solution for PVC and TPO membranes. The innovative attachment system leverages the same fastener and plate to secure the membrane and insulation in place but doesn’t penetrate the membrane. Using the isoweld system increases installation speed and agility with 1-step calibration and constant monitoring of the membrane temperature. 

The SFS isoweld line also includes proprietary stress plates, fasteners, and magnets to significantly improve your next commercial roofing project.

Why choose TPO vs. PVC roofing membrane?

TPO is typically cheaper while providing many of the same characteristics as PVC.  However, PVC is generally viewed as a higher-quality material and has several advantages over TPO roofing systems:

• PVC is more flexible

• PVC’s flexibility can make it easier to install and speeds up the process

• PVC has a higher chemical resistance, making it better suited for commercial buildings such as restaurants

Meanwhile, TPO excels in a few areas:

• TPO isn’t as likely to burn during detail work

• TPO is typically more affordable upfront 

• TPO does not contain the plasticizers present in PVC which may shorten PVC’s lifespan and makes it less environmentaly friendly

Both TPO and PVC roofing membranes last between 20-30 years. However, TPO is relatively new to the market and may last longer than initially anticipated.

The roof installation environment is a major limiting factor when choosing between TPO and PVC membranes. Keep in mind that some building codes may specify requirements one membrane type wouldn't meet.

What is the difference between TPO and PVC membranes?

TPO and PVC roof membrane materials overlap in many key areas that go well beyond the installation process. However, there are a few differences to note when making a decision for your commercial roofing project.

How does the price vary between TPO and PVC membranes?

Prices for TPO and PVC vary, but typically, TPO comes out cheaper. The total installation cost will vary depending on the method employed and the quality of the material used. However, TPO membranes are easier to install due to their increased flexibility, which can speed up the process.

While cost can be a consideration when choosing which material to use, material strengths should be a more important deciding factor. For example, PVC may be more cost-effective on a building with chemical hazards or restaurants where TPO would degrade faster and require more maintenance.

What else should be considered when selecting TPO vs. PVC membranes? 

Weather conditions and climate can play a role in determining the best material for a commercial roof. TPO has issues with dimensional stability in higher temperatures and has caused concern for condensation in certain climates due to its white surface.

A study conducted by SPRI showed some condensation under highly reflective membranes over a five-year period. However, the damage to the foam insulation was minimal, and no rust was present on the steel deck. 

While SPRI attributed the moisture accumulation to design issues, they did recommend further studies into other climate zones.

Discover SFS solutions for your commercial roof membrane needs

SFS offers fantastic stress plate options in both PVC and TPO. While all plates have adhesive, ours leverage a proprietary formula that pairs perfectly with our isoweld® system. Unlike other options on the market, the isoweld® system allows for installation over foil-face insulation. Induction welding with isoweld® allows for variation in plate patterns to accommodate different wind loads.