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R&A Contracting - Energy Value ratings commercial roofing

This post is part of four-part series exploring energy efficiency values in insulation, such as K-Value, C-Value, R-Value, and U-Value.

What is R-Value? What does R-Value mean in commercial roofing insulation?

Each insulation type is designed to keep environmental energies contained or controlled, the most obvious of which is temperature. Different values are measured to determine the insulation quality and its relation to controlling or containing environmental energies. The thermal resistance value of an insulation type is most easily measured by its R-Value, or Resistance-Value. You may have seen “R-Value” on the side of an insulation package and heard people rave about the R-Value, but you still wonder…

What’s R-Value?

ASTM International defines thermal resistance as:

Resistance, thermal, n: the quantity determined by the temperature difference, at steady state, between two defined surfaces of a material or construction that induces a unit heat flow through a unit area. (ASTM International C168)

This is a similar energy value measurement to C-Value where the thickness of an insulation type is measured against the energy flow impacting the insulation surface. While C-Value measures the thermal conductance (how much energy actually flows through in proportion to the thickness of the insulation), the R-Value measures how well the insulation resists the energy flow. It’s the difference between measuring how much water can leak through a 3″ sponge versus a 1″ sponge (C-Value) versus measuring how much water is kept out from a 3″ sponge versus a 1″ sponge.

How to measure R-Value

You may wonder, “What does R-Value have to do with K-Value or C-Value?”Calculating the R-Value of an insulation type can be done in one of two ways:

Equation 1: R-Value = 1/C-Value; Example: If the C-Value is 0.25, the R-Value is 4.0 (1.0 divided by 0.25 = 4.0)

Equation 2: R-Value = thickness/K-Value; Example: If the K-Value is 0.5 and the thickness is 3.0″, the R-Value is 6.0 (3.0″ divided by 0.5 = 6.0)

The good news is you don’t have to be an insulation expert to know what roofing solution and insulation material is right for your roof. Our R&A Contracting team is committed to giving you the information you need to make informed, easy decisions. If you have questions, we’d love to hear from you.

I’d be an idiot if I did not take this opportunity to communicate to you how much we appreciate the way in which you conduct business and take care of our facility. In my experience you, and your team, are at the top of the list of all the roofing companies I’ve dealt with over the years. Thank you!

Jim Lowry - Bissinger's Handcrafted Chocolatier

Eric and crew were really nice to have around. They were courteous, careful and caused little if any disruption. Their work looks good too! To be honest… a good experience with a product that I initially had misgivings about. I’m a convert because of Bubba, Sam and Eric. Thank you.

Jim Lowry - Bissinger's Handcrafted Chocolatier

“I want to thank the crew at R&A for a job well done on our very leaky roof at the shop. It is certainly nice to have the drips and rivers gone from the shop when it is raining. I also wanted you to know how much we appreciated that the guys were able to stay out of our way and allowed us to do business as usual without any problems or interruptions. The roof looks great and the clean-up after the job made it so we couldn’t even tell you’d been here. Thanks for doing what you do so well!”

Jay Moore, President of Safe Way Tire and Auto Center

“My wife and I were on vacation when water pipes burst in our house. We got a hold of Craig and the R&A crew was able to start evacuating the water immediately. The best part was that they were able to start work before we even returned home. It was a very fast turnaround considering the extensive amount of water damage.”

Will from Dardenne Prairie, MO

“Craig and Mike came out in a timely fashion when we needed the work done. They did a reliable and quality job.”

Jerry from SLR Properties

“Craig helped us out tremendously with the insurance process. Timely and very professional.”

Lindell from Greater Missouri Builders (GMB)

“We purchased a house and there was some damage to the roof. Very impressed with the thoroughness of Mike’s inspection. Very comfortable with their explanation of what needed to be fixed. Most impressive was the way they protected our landscaping. Really liked the way they treated me as a valued customer, even though it was only a small project.”

Ross from Troy, MO

“I use R&A Contracting when my commercial roofs receive storm damage. They work on our behalf through every step of the insurance claim process. They perform all of the work and complete the insurance process, making our roofs better than they were before the storm.”

Director of Facilities for a large Property Management Company

“The team at R & A Contracting responded immediately when notified of our water disaster. They removed water-damaged materials and property quickly and restored our home even before the final settlement from our insurance company. They minimized how long our family had to live in a hotel and got us back to normal as fast as possible.”

Will from O'Fallon, MO