Commercial

I.   PROJECT PORTFOLIO

II. FLAT AND LOW SLOPE ROOFS:  BENEFITS, CONSTRUCTION, AND MATERIALS

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I. 
PORTFOLIO
 


HIGH RISE 

OFFICE BUILDINGS

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INDUSTRIAL

MANUFACTURING

WAREHOUSE

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MULTI FAMILY

APARTMENTS & CONDOS

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HOSPITALS

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SOCIAL & RELIGIOUS
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II.  FLAT AND LOW SLOPE ROOFS:   CONSTRUCTION, AND MATERIALS


CONSTRUCTION

Water collecting on a roof is usually related to slope. A roof that has a slope of less than 3 inches per foot is considered flat. A totally flat roof would never drain and water would exert extreme weight pressure. Any roof must have some slope, or pitch, to allow water to run off. The minimum slope for water to run off is 1% or 1/8″ per 1′. Slope is determined by the vertical rise in inches for every horizontal twelve inch length called the “run”.
A 7/12 roof means that for every 12 inches horizontally (the run), the roof rises 7 inches. Some common roof slopes (rise and run) and the terms which classify them, include:  
roofpitchdiagram
Flat Roof: 2/12
Low Slope: 2/12-4/12
Conventional Slope Roof: 4/12-9/12
Steep Slope: 9/12 and higher


THREE BASIC TYPES OF FLAT/LOW SLOPE SYSTEMS AND RELATED MATERIALS 


Flat roofing is an economical choice from a building perspective, although they can be trouble when it comes to water leakage and accumulation. In order to preserve flat roofs and the buildings beneath them, they must be covered with a good waterproof material and have a good drainage system. Below are some of the most popular flat roofing systems and a few benefits and drawbacks of each.

BUILT UP ROOFING – BUR ASPHALT

asphaltdegradationroofburasphaltroofAsphalt degradation  occurs when UV-rays oxidize the surface of the asphalt producing a chalk-like residue. Also, plasticizers leach out of the asphalt and the roof becomes brittle, causing cracking and alligatoring. This allows water to penetrate-causing blisters, cracks, and leaks.

Regular maintenance is required to ensure that a BUR roofing system attains its life expectancy. Improving the reflectivity of the existing base of a BUR system is important. Even though they are the most durable roof systems available, it is possible to extend their life cycles even further with coatings.


MODIFIED BITUMEN
In most parts of the United States, APP-modified-bitumen systems are heat-applied, as opposed to hot asphalt or adhesive applications. Built-up roofing is more commonly found on commercial buildings than on residential homes, but it’s still well suited for houses with flat roofs.

elastomericacryliccoatingselastometricblackModified bitumen is most commonly available as a smooth-surface material, although granule surfaces are available. While built-up roofing is the most economical choice for flat roofing, sunlight will eventually break down the asphalt base and the roof will need to be replaced sooner than other options.

Elastomeric acrylic coatings can smooth cap sheets to turn their black surfaces white thereby extending roof-system’s life. The coating also lowers energy costs. Elastomeric acrylic coatings provide a cool, bright white, protective seal. They maintain their bright white surfaces for long-term performance.


SINGLE-PLY MEMBRANE
Single-ply roofing works well for any type of building, but it’s most efficient for flat roof styles where traditional shingles aren’t appropriate, and single ply is much more secure than tar or spray-on materials. Single ply is generally categorized as either:
Thermoplastic (TPO) and PVC), or Thermoset (EDPM). 
The benefit of thermoplastic is that it can be heated repeatedly without damage. This allows the seams to be welded together forming a solid line of roofing which prevents leaking between the pieces.

ARGUS DIGITAL CAMERATPO membranes combine the properties of EPDM and PVC. In other words, TPO is supposed to be as UV-and heat-resistant as EPDM, and is as heat-weldable as PVC.

TPO is specifically formulated for long term weather resistance, without the use of plasticizers which have a poor performance record.

TPO roofing membranes are more expensive than EPDM. Installation of a TPO roofing membrane is a more complex process requiring specialized knowledge.

An EPDM rubber roof is easier and faster to install than a TPO.

EPDM requires no special installation equipment, but TPO needs to be hot air welded. While a beginner roofing contractor will most likely be able to properly install an EPDM membrane, you should only hire an experienced contractor to install a TPO roof. Improper installation will invariably cause leaks and will require costly repairs or replacement. It is better to spend more money and invest in a thicker membrane. Both EPDM and TPO roofs perform better and last longer if they are thicker. 
edpmseamsonroofEven so, EDPM seams come apart over time. Longevity of a single-ply roofing membrane depends on the method by which the overlapping seams are attached together. Permanently attached seams are the safest solution; improper attachment can be the cause of 99% of leaks. 

As seen below, two of the hardest flat roof systems to tell apart are the PVC roof (left) and the TPO roof (right).
pvccoolroof tpocomparedwithpvc
Both are white, heat welded systems that look virtually identical, but TPO is one of the most popular commercial roofing materials and costs less than PVC.


                                                                               RESTORATION/RE-COAT
Repair and Coat applying either the highly recommended Silicone or Acrylic Materials.
With either System the roof does not require complete tear-off and both provide a seamless, weather-tight seal over the existing Cap Sheet, Modified Bitumen System.  Considered Roof Maintenance, the Restoration/Re-coat is a first year tax write off, as opposed to a tear-off/re-roof  which is a write off over the life of the roof system.
Two major differences between Silicone and Acrylic:  
Silicone  is recommended for roofs with ponding issues, as it maintains its integrity despite standing water.
SILICONE WARRANTY:  20 YEARS MATERIALS 20 YEARS LABOR
ACRYLIC WARRANTY:  10 YEARS MATERIALS 10 YEARS LABOR
WHY SILICONE?
* It eliminates the need for a complete tear-off with the related cost of plywood replacement.
* Seals and repairs the existing roof and permanently protects against leaks, ponding water, and weather, and      has excellent resistance to mold, mildew and staining.
* It won’t break down over time; the product applied today won’t reduce or wear away tomorrow.
* It will not require a re-coat and has limited dirt pickup.
* It won’t break down over time; the product applied today won’t reduce or wear away  tomorrow.
 * Do it once and you’re done!

Acrylic RoofSilicone Roof
Both the Silicone and Acrylic Roofing Systems are Cool Roofs. The Title 24, California Building Energy Efficiency Standard for a cool roof is described as an Aged/ 3 Year Solar Reflective Index (SRI) equal to or greater than 75. The Voluntary CALGreen Tier 2 Aged SRI is 78. According to the Climate Resolve press release, cool roofs,can be more than 50°F cooler on the surface of the roof during a hot summer day and can cool the interiors of buildings by several degrees Fahrenheit, reducing chances of heat-related injuries or deaths. Keeping temperatures down on Extreme Heat Days  saves on air conditioning costs and protects lives; energy efficiency will save millions of dollars; and cool roofs will help Los Angeles combat global climate change at the local level.

FOR ADDITIONAL INFORMATION,
PLEASE REFER TO THE FOLLOWING LINKS:

COMMERCIAL ROOFING PRODUCTS     LEARN ABOUT COMMERCIAL ROOFING

RESIDENTIAL/COMMERCIAL SLOPED/PITCHED

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