How does Commercial Roofing Differ From Residential?

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Information about How does Commercial Roofing Differ From Residential?

Phil Puccio

Commercial Roofing System in Port Charlotte, FL 33981

Commercial roof systems differ from residential roofs depending on the roof pitch and primary use of the building. An experienced roofer will be aware of the many different types of commercial roofing systems. And they can advise you on which ones to use for specific commercial purposes.

Most condominium associations and some storefronts have regular asphalt clapboard roofs. This is standard for roof pitches of at least 4:12. This term means a pitch of 4:12 The roof rises 4 inches for every 12 inches of horizontal distance. Most roofersAsphalt shingle manufacturers recommend a pitch of 4:12 or greater. On roofs between 2:12 and 4:12, manufacturer and industry guidelines require, or at least recommend, special underlay or other materials under shingles.

asphalt shingles

You can install asphalt shingles on some commercial roofs as well as residential roofs. For condominium and similar commercial pitched roofs, roofers must estimate the span of the roof and calculate the numbers for the roofing system differently.

Contractors also calculate ventilation numbers differently. In most condos, there is usually enough entry at the bottom jamb. Because larger roofs have significantly more draft, a smaller section of ridge vent should be used.

Materials for flat roofs

Shopping malls, large department stores, and restaurants generally have flat and flat roofs. You cannot shingle roofs with low pitches between 2:12 and flat. Unlike most residential roofs, building codes require that the commercial roofing system on flat roofs include a 3½-inch sheet of insulating foam. The roofing material adheres to the foam board that is laid over the base course.

Commercial roofers are trained to apply other types of commercial roofing materials. Some of the most common types of commercial roofing materials for low pitch commercial roofs and flat roofs are:

Asphalt rolled roofing

Low pitched roofs often use this type of material. It is made from the same material used to make asphalt shingles. One of the less expensive types of roofing, rolled asphalt roofing is easier to install but not energy efficient. Rolled asphalt roofs have a very short lifespan compared to other roof types, typically only around 10 years. Roofers unroll this roofing product and then tape it at the seams. However, leaks and other problems often occur where the rolls abut, increasing the need for maintenance and repairs.

EPDM (ethylene propylene diene monomer) roof covering.

Commonly known as rubber roofing, this is one of the cheapest roofing materials available. Relatively easy to install and very light, a quality EPDM roof is not easily damaged by UV rays. It can have a life expectancy of up to 20 years. Because an EPDM roof is black, it absorbs a lot of sunlight and outside heat. And in Florida, this can put a strain on a building’s air conditioning system.

While not easily scratched or chafed, EPDM roofing is prone to punctures. This means that a hailstorm or falling branches can tear a hole in your roof. Also, it is important to note that you are joining the seams of an EPDM roof with adhesives. If an EPDM roof is not fully bonded or comes loose, water can get under the membrane. Locating a leak is more difficult and allows a leak to do far more damage to the underlying structure before it can be detected.

Roof covering made of TPO (thermoplastic polyolefin).

TPO is one of the less expensive types of commercial roofing material and is sometimes less expensive than EPDM. It is installed using a heat-weld system that literally fuses the plastics together in the membrane. This creates a more reliable bond between the seams and essentially a single sheet roof system. Because TPO is white and reflects the sun, it helps reduce heat build-up in your building. In contrast to EPDM, TPO relieves your air conditioning system. Advantages of TPO:

  • Easy
  • Resistant to corrosion and puncture
  • Not prone to algae growth or mold
  • No pressure cleaning required.

One of the disadvantages of TPO is that it varies in quality and thickness depending on the manufacturer. The top layer of TPO roofing material is laminated, making it susceptible to shrinkage, cracking, cracking and deterioration. TPO rolls are also typically available in narrow widths. This results in many seams during installation, potentially weakening the roofing system and leading to future problems. In addition, TPO itself is not fire resistant and can be dangerous unless the correct retarders are incorporated into the roofing system.

PVC (polyvinyl chloride) roof covering.

PVC consists of two layers of PVC roofing material with a polyester reinforcement between the layers. It contains additives that make the material UV-stable and flexible. Installation for PVC roofs uses heat welding at a lower temperature than TPO. This creates a permanent bond between each membrane and keeps the seams securely together.

Like EPDM and TPO, PVC is lightweight and also very durable. The lifespan of PVC commercial canopies is comparatively long as they are particularly resistant to moisture, fire, wind and chemicals. Most importantly, PVC does not absorb or be weakened by oils and greases. This makes it the preferred film for restaurants and other buildings that have grease traps on the roof.

The downside of PVC: It is a more expensive option than TPO or EPDM commercial canopies. Over time, PVC can shrink, which can lift corners, pull seams, and cause leaks. Although not a problem in Florida, older PVC roofing tends to crack and puncture in very cold weather. PVC roofs can also be difficult to repair. In general, PVC and TPO are usually compared a lot since they are both heat welded and have similar properties.

SPF (Spray Polyurethane Foam) roofing

SPF is made from a plastic that is applied to a roof terrace as a liquid and turns into a solid in seconds while expanding to 30 times its original size on drying. The SPF acts as an insulating layer. Its reflective top layer helps builders save on both AC and heating costs. A good multi-layer SPF system, such as B. Spray foam covered with layers of premium acrylic roof coating has excellent tensile strength and durability. SPF can correct backwater or drain water more effectively. Spray more foam in areas that need lifting.

With proper maintenance and regular roof coatings, an SPF roof can last 40 years or more. Because SPF roofing is the product of a chemical reaction between two liquid compounds, it must be applied in a carefully calibrated manner as the resulting spray foam will not last long. A roofer must have special training to install this type of roofing material. SPF roofs can also be difficult and expensive to remove, which can become necessary if not properly maintained.

Hear Kelly Shepard describe the different types of commercial roofing All Weather Tite is installing in Florida:

For more information on commercial roofing systems or to schedule a quote, contact All Weather Tite Roofing. All Weather Tite Roofing experts will evaluate your roof and give you the best recommendation for a commercial roofing system that fits your budget.

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