National Coatings Blog

Wondering If You Have A Low-Sloped Roof?

Posted by Nicole Gale on Tue, Feb 21, 2017 @ 11:00 AM

DSCF5510.jpgMore than likely, you have a building with a low-sloped roof or a steep-sloped roof. How can you tell the difference? As defined by ASTM Standard E 1918-97, a low-sloped roof has a surface with a slope of 2:12 inches or less and a steep-sloped roof has a slope greater than 2:12 inches.

Low sloped roofs are sometimes referred to as a flat roof; however, the pitch on a low-sloped roof is greater than that of a flat roof, which is 0 inches to 2 inches. Low-sloped roofs are designed with some pitch, to allow water to flow off the rooftop into a proper drainage system. A dry rooftop ensures the roof will remain durable and watertight. Ponding of water can increase the likelihood of a leak, and can promote algae, mold, or other plant life to grow, causing damage to the roofs surface.

Often times, low-sloped surfaces have one of the following roofing products on them: Roof coating systems, single-ply membranes (EPDM, Hypalon, TPO and PVC), asphalt, built-up-roofs (BUR), modified bitumen or mod bit, spray polyurethane foam (SPF), or metal. A low-sloped roof also has components such as flashings, copings, and drains.

Cool RoofLow-sloped roofs can greatly benefit from reflective roofing products by creating a cooler indoor ambient air temperature, lowering energy utility bills and lengthening the lifespan of the roof. The easiest and most cost effective of these products to install would be a Cool Roof Coating System because it can be installed directly onto the existing roof membrane without needing to tear-off the existing roof. Cool Roof Systems also do not require businesses to close during installation as they are non-disruptive.

For additional information on roof coating systems, reflectivity and Cool Roof Coatings, download our FREE Product Brochure.

Commercial Roofing Contractorsg

Tags: low slope roof, Commercial Roofing

What are “Flat Roofing Systems”?

Posted by Nicole Gale on Tue, Nov 25, 2014 @ 12:30 PM
021There are two types of roofs: low slope, (which is often referred to as a “flat roof”) and steep slope roofing. Low-slope roofs are less than or equal to 3:12 or 14 degrees in slope and steep slope exceeds 3:12 or more than 14 degrees in slope.

Flat roofing systems that can be installed on a low-slope rooftop include: 

  • Asphalt Membranes – Including Built-Up (BUR), Mod Bit and Cap Sheet
  • Metal Systems
  • Roof Coatings
  • Single-Ply Membranes – Including EPDM, Hypalon, PVC and TPO
  • Spray Polyurethane Foam (SPF) Systems 

Like all roof materials, these flat roofing systems provide weatherproofing, reinforcement and surface protection. Low-sloped roofs have an asphalt, metal, single-ply or SPF roofing system initially installed on top of it. A roof coating system is often added on top one of those systems for an increased roof lifespan, energy savings, protection, maintenance and/or restoration.  

CLICK HERE TO FIND OUT: What's The Difference  Between "Cool Roof"  Versus A "Normal" Roof? Roof coatings can be added during the construction phase to increase reflectivity, provide additional protection and decrease energy consumption. Coating an asphalt roof covers the black surface of the roof and creates a white rooftop, which allows the building to remain a cooler temperature without the extra use of air conditioning. (Check out our graphic showing how a “Cool Roof” saves a substantial amount of money versus a “Normal” aka black roof.) Coatings are also added during the construction phase onto SPF systems to protect the foam from the sun’s harmful UV rays. The UV rays would cause premature degradation to the foam, if the foam wasn’t covered and protected by the coating. This is a necessary step to applying a spray polyurethane foam system to any rooftop. 

Roof coatings are also applied onto these flat roofing systems when initial signs of degradation and failures occur. The coating systems are able to restore and renew these flat roofs to new without a costly tear-off, without business closures or disruptions and for a very competitive cost. The roof coatings extend the lifespan of the roof up to 20 years and can be re-coated every 10 or so years to restore your existing roof indefinitely. This can save you thousands of dollars by avoiding a traditional roof replacement. Read our article: Life Cycle Cost Analysis Using Roof Coatings for a detailed cost analyses.

If you are interested in more information on roof coatings for flat roofing systems, download our Free Product and Application Brochure, or our Considering Coatings – a Free Guide to Roof Coatings.

Commercial Roofing Contractors

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Tags: Flat Roof Materials, low slope roof

Roof Coatings are Excellent for Flat Roof Surfaces

Posted by Nicole Gale on Thu, Dec 26, 2013 @ 10:00 AM

With all the options on the market for flat roof materials, why should I choose a roof coating system for my building?

Flat Roof materials

Excellent question! Roof coating systems have 4 primary benefits that other flat roof materials cannot offer:

1.    Spray Applied – Custom Tailored to YOUR Roof’s EXACT Needs
A roof coating system is applied by spraying the coating directly over the existing aged or failing membrane. This allows the coating to spread to those hard to reach areas, go around and under pipes, fully covering the surrounding surface areas of skylights, gutters, HVAC systems and other equipment placed on your roof. Other flat roof materials, such as single-plies, require you to cut around and patch these areas with a roof sealer. Not only does this add additional cost in labor, but these cut out and patched areas do not provide the same waterproofing protection as a single, fully adhered, monolithic membrane. A roof coating system covers the full surface of a roof field, leaving no unprotected areas to insure full waterproofing. Roof coatings provide excellent protection and coverage no matter what particular characteristics your roof possesses.

2.    Seamless
A seamless roof membrane is an ideal membrane because there are no holes, seams or patched areas that could create a possibility of leakage to occur. AcryShield roof coatings are packed full of ingredients that allow them to expand and contract with the changes in weather temperature. The seamless membrane moves together and pulls at an even rate across the roof field when temperatures rise and fall. Single-ply membranes such as TPO, EPDM and Hypalon have seams that are welded together and puncture holes where the single-ply is rolled out onto the roof and adhered to the existing membrane. These seams and holes carry the majority of the extra stress and pressure when the weather changes and are often the first areas to being tearing, causing leaks and premature roof failure.

3.    High Reflectivity – Added Protection to Prolong Roof Life
Roof coatings come in a range of colors but when looking for a highly reflective coating, you want to choose a bright white one that is full of UV blocking pigments. These pigments are necessary to provide protection for your roof from the leading cause of roof degradation – the sun. The sun’s UV rays break down the surface of a roof, resulting in a brittle roof membrane that easily cracks and tears, causing early roof failure and leaks. This is preventable with a highly reflective roof coating, such as the AcryShield A590. National Coatings has multiple coatings that are listed on the Cool Roof Rating Council for having high reflectivity and solar reflectance. While roof coatings provide excellent reflectivity, it is important to note, proper roof maintenance is key when wanting to extend your roof life indefinitely. The AcryShield Roof Maintenance (ARM) System, provides exceptional waterproofing protection and coverage to your roof. When applied every 10 years, the ARM System allows you to restore your roof to new, while never needing to do a costly tear-off.

4.    Non-Disruptive Application
Lastly, a roof coating system is an excellent choice for a company that cannot be disrupted from their normal, daily work environment. When a National Coatings roof coating system is applied to your roof, there are no noises from drilling, nailing or seam welding and due to the ultra low VOC content in the coatings; there are no harmful or strong odors. This is why hospitals, hotels, malls, and many other fortune 500 customers have chosen to use National Coatings products.

For additional information on roof coating systems, check out our full product brochure!


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