Posts Tagged ‘single-ply roofing systems’

Types Of Flat Roof Systems

July 27, 2010

Flat Roofing

Although they are not as alluring as slate, tile or wood roofing, a flat roof is still extremely significant and may even require more attention.  Flat roof systems work by providing a waterproof covering over a building.  Water is then directed to drains, downspouts, and gutters by the slight pitch of the roof.

The Four Different Types of Flat Roofs

There are four main different types of flat roofing. They are:

  • Built-Up Roofing (BUR)
  • Single Ply Membrane
  • Sprayed Polyurethane Foam (SPF)
  • Roll Asphalt

Built-Up roofing (BUR) is composed of overlapping rolls of saturated or coated felts, literally built up to form layers. These roofs are designed to last 10 to 30 years, depending on the materials used.

Single Ply Membrane roofs come in two main types, thermoset membranes and thermoplastic membranes. Warranties of 10 to 12 years are typical, but as with any roofing system, proper installation is crucial and maintenance by the owner is still required.

Sprayed Polyurethane Foam (SPF) is a seamless roof system consisting of a layer of foam, sealed and protected by a resilient coating. It has been used successfully as a roofing and insulation material for over 30 years.

Roll Asphalt roofing has been used for the longest. This type of roofing typically consist of one layer of asphalt-saturated organic or fiberglass felt, applied with nails and cement, and then covered with a mineral surface. Generally, roll asphalt will last about 10 years.

Looking For More Information About Flat Roofing?

Roofing or re-roofing your home is a great investment. You’ll want to make sure you get a quote from a reliable roofing contractor.

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EPDM Single – Ply Roofing Systems Part 2

July 13, 2010

How Long Do They Last?
As with most roofs, EPDM rubber roofs have varying lifespans that depend on numerous criteria.  These include environmental conditions such as what type of building (factory or church), how much foot traffic the roof gets, how much water remains on the roof after a rain, and how long it take that water to evaporate.  Not to mention geographical location.  Roofs in mild climates will outlast roofs in harsher climates.  Of course, one of the most important factors in a roof’s life expectancy is quality of workmanship.  If the roof is not properly installed, then its lifespan will be shortened.

Properly installed EPDM rubber roofs should last between 12 and 25 years.  Here’s a brief breakdown base on observations over the past 15 years::

  • 45 Mil Ballasted EPDM Rubber properly installed that drains well – 12 years
  • 45 Mil Mechanically Attached roof properly installed that drains well – 12 years
  • 45 Mil Adhered roof properly installed that drains well – 12+ years
  • 60 Mil Ballasted EPDM Rubber properly installed that drains well – 12+ years
  • 60 Mil Mechanically Attached roof properly installed that drains well – 15 years
  • 60 Mil Adhered roof properly installed that drains well – 15+ years
  • 80+ Mil Mechanically Attached roof properly installed that drains well – 20+ years
  • 80+ Mil Adhered roof properly installed that drains well – 20+ years
  • 80+ Mil Fleeceback Adhered roof properly installed that drains well – 25+ years

Available in a Variety of Membrane Thicknesses and Roll Sizes

Single Ply Roofing Systems

JM EPDM Roofing Membranes

Standard Roll Sizes (* Full-width, no-fold membrane)

Product Widths Lengths
45 FR 10′ (3.05 m) 50′, 100′ (15.24 m, 30.48 m)
20′ (6.1 m) 50′, 100′ (15.24 m, 30.48 m)
30′ (9.14 m) 100′ (30.48 m)
40′ (12.19 m) 100′ (30.48 m)
60 FR 10′ (3.05 m) 50′, 100′ (15.24 m, 30.48 m)
15′ (4.57 m)* 100′ (30.48 m)*
20′ (6.1 m) 50′, 100′ (15.24 m, 30.48 m)
30′ (9.14 m) 100′ (30.48 m)
90FR 10′ (3.05 m) 100′ (30.48 m)
45 R 10′ (3.05 m)
60 R 10′ (3.05 m) 100′ (30.48

EPDM Single – Ply Roofing Systems Part 1

July 8, 2010

EPDM Single – Ply Roofing System

EPDM: Ethylene Propylene Diene Monomer (or Terpolymer which is simply a product consisting of three distinct monomers).  EPDM is classified as a Thermoset material which means it is either fully-cured prior to being installed or that it cures during natural weathering after installation.  EPDM roofs are single-ply membranes meaning there is only one ply of roofing material, not multiple plies laminated together.

EPDM has been in use on roofs in the USA since the 1960’s and is one of the most common types of low-slope roofing materials.  This is because it is relatively inexpensive, simple to install, and fairly clean to work with when compared to conventional built-up roofs.  There aren’t the odors and fumes that accompany built-up roofs which appeals to many property owners and managers.

EPDM is a rubber material whose principal components consist of the compounds ethylene and propylene.  A flexible rubber matrix forms when a small amount of diene is added to the mix.  EPDM is available reinforced or unreinforced with both commonly used; it’s also available in either a cured (vulcanized) or uncured (non-vulcanized) state. Vulcanized EPDM is the most common with non-vulcanized often used for flashing purposes.

EPDM membrane thickness ranges from thirty mils (0.030″) to one-hundred mils (0.100″) with the most common thicknesses being forty-five mils (0.045″) and sixty mils (0.060″).  There are three standard application procedures:
(1) fully-adhered
(2) mechanically-fastened
(3) loose-laid

Fully-adhered EPDM uses water or solvent-based adhesives to adhere the rubber to the substrate.  Mechanically-fastened EPDM is attached by manufacturer-approved mechanical means to the substrate, and loose-laid membranes are secured only at the perimeters and any penetrations.  A ballast of round river rock or concrete pavers is used to hold the materials in place.  River rock is usually installed at a rate of 1000 – 1200 pounds per roof square (100 square feet) and the pavers generally weigh approximately 20 pounds per square foot.  Structural integrity is important with loose-laid roof systems.  The seams of all systems are then sealed using either an adhesive or a splice tape.  Splice tapes have tested with a higher tear-strength.

Single-Ply PVC Roofing Membranes

July 6, 2010

GAF EverGuard PVC thermoplastic single-ply membrane systems have been engineered to provide superior long-term performance and enhanced durability.  Strong, flexible, EverGuard PVC membrane is suitable for use in all types of single-ply systems: Mechanically Attached, Ballast Applied, Fully Adhered.

Compared to typical single-ply EPDM, PVC and TPO membranes, GAF EverGuard PVC roofing membrane provides the benefits of all three materials in a single membrane: low installed cost, heat welded seams, white reflective color and tear/puncture resistance.

A custom prefabricated, reinforced, thermoplastic single-ply roofing system that is ideal for any commercial, industrial, or residential (flat or low-sloped) application.  Industry-leading standard commercial warranty has no exclusions for ponding water or consequential damages.  White membrane is highly energy-efficient, reflecting up to 87 percent of the sun’s energy, reducing the energy needed to air-condition a building & saving building owners money.  Extremely durable & easily installed by authorized contractors without disruption to daily operations, the roofing system is also leak-proof, energy-efficient, chemical & fire resistant, resistant to high winds, and virtually maintenance-free.

Because of GAF-Elk’s stringent standards, only the top 3% of all roofing contractors have qualified as Master Elite contractors! Choosing a GAF-Elk Master Elite contractor is your assurance that you’ll be dealing with a quality, reputable, and dependable professional contractor — not some “fly-by-nighter.”

What Are The Major Types of Single-Ply Roofing Systems For Commercial Properties?

March 18, 2010

TPO, EPDM, and PVC Are The Three Major Types of Single-Ply Membranes

Single-Ply membranes have been around for over 20 years.  The biggest advantages to these single-ply roofing systems are is that they are light weight per square foot.  This makes them an ideal choice for retro-fitting over an existing roof system.  This allows for quicker installation, less disruptions to the building owner, and most importantly, cost savings.  Many single-ply membranes are white and provide superior reflectivity, which in turn helps to reduce A/C costs during summer months.  These roof coatings are very versatile and can be applied on a large variety of roof systems.  Extremely durable & easily installed by authorized contractors without disruption to daily operations, the roofing system is also leak-proof, energy-efficient, chemical & fire resistant, resistant to high winds, & virtually maintenance-free.

The importance of roof coatings cannot be ignored if you want to avoid the complications of roof repair.  Select only quality products for roof repairing will assure you of the best results and minimize future repair costs to your property. 

Commercial roofing systems have improved in durability and longevity through years of trial and error from almost every major manufacturer in the industry.  Thanks to their efforts, the leading commercial roofing manufacturers are producing better products, even for old concepts.  That’s why flat roof systems are being used on everything from laundry mats to shopping malls and banks.  The biggest concern for architects and commercial builders is selecting the right system and finding a qualified roofing contractor to install it properly.

SEE ALSO:
EPDM Single – Ply Roofing System
PVC Single – Ply Roofing System
TPO Single – Ply Roofing System