National Coatings Blog

Ponded Water On Your Commercial Roof Can Lead To Roof Damage

Posted by Nicole Gale on Thu, Feb 23, 2017 @ 08:00 AM

canon_10-5-07_373.jpgThis winter has been quite a wet season, bringing to light many roofing issues that have created leaks. Ponded water is one of the issues that can lead to damage if it is not properly taken care of.

What is ponded water?

The National Roofing Contractors Association (NRCA) defines ponded water as "water that remains on a roof surface longer than 48 hours after the termination of the most recent rain event.” Water that sits on your roof top for an extended amount of time can lead to blistering, delamination and peeling of the roof surface. This ultimately results in a leaking roof that is in need of repair.

What Causes Ponded Water?

Ponded water can occur on the rooftop either because of a poor slope design or drainage issues. Conducting a semi-annual roof maintenance inspection every six months helps ensures that your drains are not clogged or obstructed and they are working as expected. Roofs that have a bad slope causing rainwater to constantly pool together in a specific location will need to be fixed by a roofing professional.

Solving Ponded Water Issues

acryshield-spf-diagram-roofguard.pngThere are roof coating systems, such as the AcryShield SPF Roofing System which allows a roofing contractor to create a new custom slope directly on top of your existing roof, ensuring that the next time it rains, the water will lead to a drain. The spray polyurethane foam (SPF) used in these systems is applied heavier in areas to create an angle that draws the water towards the drain. The base coats used in the AcryShield SPF Roofing System also add additional ponded water protection as they are capable of retaining their waterproofing and superior adhesion capabilities after being submerged in water for an extended amount of time.

National Coatings has a full line of AcryShield roof coatings that provide excellent waterproofing, superior adhesion, and resistance to ponded water for almost any roofing substrate including: Asphalt, BUR, Mod Bit, TPO, PVC, EPDM, Hypalon®, Metal, SPF and Concrete roofing. If you would like more information on our base coats or roofing systems with ponded water resistance, download our FREE Product Brochure!

SPF Roof Coating

Tags: Ponding Water Resistance

High Grade AcryShield Roof Coatings Provide Excellent Ponded Water Resistance

Posted by Nicole Gale on Tue, Mar 24, 2015 @ 08:30 AM

img_0185Ponded water resistance is the ability a roof coating can remain bonded and adhered to the roof substrate after being submersed in water for an extended period of time. The National Roofing Contractors Association (NRCA) specifically defines roof ponding as "water that remains on a roof surface longer than 48 hours after the termination of the most recent rain event". This becomes extremely important when puddles form on the rooftop due to poor slope or drainage issues. Without proper ponded water protection, your roof coating will begin blistering and peeling, causing leaks and corrosion to occur, leading to untimely roof failure.

Ponded water protection should be a necessary benefit included in all roof coatings; however, inferior coatings often cannot perform to that level, causing delamination and adhesion issues when the coating is submerged in water. Ponded water can occur on any roof due to poor design or when drains are clogged and are not able to function properly. This is rather common, especially when semi-annual roof maintenance inspections are postponed or skipped completely. Many roofs experience slopes that do not lead to a drain; this causes rainwater to constantly pool together in a specific location each time it rains, only being alleviated once the water begins to evaporate and dry up over time. 

Learn about the  Benefits of Coating  an SPF Roof  Download our FREE GuideIf you currently have a roof coating installed on your roof, you can determine if the coating has ponded water protection by evaluating an area that has be submerged under water for 1 or 2 days. Press on the area with your thumb and see if the coating is still adhered to the substrate below. If proper adhesion is not occurring, you need to address the issue and solve it immediately. You will need to select a roof coating that can provide proper ponded water protection and you may want to look into an AcryShield SPF Roofing System that allows you to create a new custom slope on the roof that will lead to a drain using spray polyurethane foam – click here for more information.

If you are in search of a new roof coating system for your building and want to determine if the coating has resistance to ponded water, it is best to evaluate the products technical data sheet, test on your roof for actual performance and get referrals for products that claim to provide this protection.

National Coatings has a full line of AcryShield roof coatings that provide excellent waterproofing, superior adhesion, and resistance to ponded water for almost any roofing substrate including: Asphalt, BUR, Mod Bit, TPO, PVC, EPDM, Hypalon®, Metal, SPF and Concrete roofing.

For more information on our base coats or roofing systems with ponded water resistance, download our FREE Product Brochure!

Download our FREE Benefits Brochure For Detailed Information On Our Systems & Coatings

Tags: Ponding Water Resistance, acrylic roof coating, adhesion

Does Your Coating have Ponding Water Resistance?

Posted by Nicole Gale on Thu, Mar 27, 2014 @ 08:00 AM

Understanding the Concept of Ponding Water

ponding water

First, ASTM D6083, the governing specification for acrylic roof coating, has certain minimum LABORATORY requirements related to ponding water. The first is ASTM D1653,"Test Method for Water Vapor Transmission of Organic Coated Films". In this test, a piece of the roof coating is used as the bottom of a cup and the amount of water that passes through this assembly is measured. Lower values indicate that the coating is more water resistant.

The second test is ASTM D471,"Test Method for Rubber Property Effects of Liquids". Simply restated, this test determines how "sponge-like" the coating is when submerged in water. Lower numbers indicate the coating will be less prone to swelling when submerged. Less swelling reduces stress at the bond between the coating and the roof substrate.

The third test is ASTM C794,"Test Method for Adhesion-In-Peel of Elastomeric Joint Sealants". This test measures dry and wet peel adhesion. The wet peel adhesion test is conducted immediately after the coating and roofing substrate have been submerged in water for one week.

Now let's return to the "Real World" of ponding water resistance. If we remove our lab coats and put on our consultant/contractor cap and want to determine if a coating has "Ponding Water Resistance", we would go on the roof, walk over to an area where water has ponded, press on the coated roof with our thumb and see if the coating is adhered or if it has delaminated. A good roof coating with superior protection against ponded water would look no different under water as it does above water. The adhesion would be the same and there would be no peeling or delamination occurring. (Check out NCC’s base coats, which provide excellent waterproofing, superior adhesion, and resistance to ponded water!)

To conclude: the "Real World" question should not be "Does your coating have ponded water resistance?" but rather "Does it stick when it is wet?"

Call National Coatings 800-423-9557 or go to our Contact Us page if you have questions or concerns regarding ponded water. We are here to help you!

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Tags: Roof Maintenance, Ponding Water Resistance, Roof leak, roof leak repair, roof leaking