SPF Versus. Built-Up Roofing Which is the best for a Flat Roof?

Nov 23

You may imagine black tar being swept across flat roofs when you think of a commercial roof. However, you now have more options to meet your requirements regarding pricing and performance.

What makes "conventional" built-up roofing distinct from spray Polyurethane Foam Roof?

Roofing Systems wants our clients to be informed of the most recent information. We've written an article explaining the differences between built-up roofing and SPF systems in order to assist you in making educated decisions on which roof will be the most suitable for your business.

Roofing with Tar and Gravel

Built-up Roofing Systems are used in the United States since more than 100 years. They are recognized by their more common names, "Tar and Gravel" roofs. Roofs that are built-up consist of alternating layers of tar or asphalt along with supporting fabrics, that are applied directly onto the roof. There is the option of choosing the amount of layers (or plies) to be erected. The final layer of the roof structure is made from gravel or stone.

Roofing Spray Polyurethane foam (SPF). The liquid is applied to an existing roof. It expands to form a foam, and then forms the solid layer.

While SPF roofing is not the most well-known kind of roofing material, it has been used for commercial, industrial and residential buildings since the 1960s.

Installation and Performance of Spray Polyurethane Foam (SPF) Roof

COST

A roof that has been built up. This price range can fluctuate dependent on the type of material you select. SPF Roofing is a firm that is specialized in roofing.

An average SPF roofing system will cost between $4.00 and $7.00 per square foot of the materials and labor costs for a standard 20,000 square foot business roof. This price range is based on an average-thickness SPF roof, as well as the structural of the structure. Spray foam roofing is amortized in energy savings in 5-10 years.

INSTALLATION

The Parma Ice Rink Building has an SPF roof, which was constructed by Roofing Systems. The initial layer may be adhered to the roof substrate directly. If needed the base sheet may also be attached to the roof to create a flat and safe space. In a built up roofing system that is made up of layers of bitumen interspersed with reinforced fabric. Property owners have the option of selecting between three, four or five Ply roofs that will meet their financial requirements and budget.

The final layer, composed of stones or rocks, shields the layers below from ultraviolet radiation, extreme heat wind-related damage. A gravel coating may be used to enhance the appearance of your roof look more appealing. The roof needs to be cleaned with the pressure washer, which is at 3500 PSI.

Instead of taking the roof in entirety, the contractor will just take off the areas that are saturated. Contractors in roofing harrisburg will prepare the substrate by cleaning away dust, dirt and contaminants.

The contractor will put down the polyurethane layer as the initial layer. It is made by mixing two liquids and then spraying them onto the roof's substrate. When the liquid is sprayed over an existing roof it expands to form a solid foam layer. When the SPF layer is finished and cured, it is coated with a layer or layers of elastomeric silicone or acrylic coating with embedded grains.

ADVANTAGES

If it is properly maintained and installed, a commercial built-up roof will last as long as 40 years. Built-up roofing systems also offer other benefits:

The waterproof and seamless surface is completely seamless. The seamless solid surface is completely waterproof and has no seams or joints, so leaks are blocked in the most vulnerable places.
UV Rays are Reflected -- UV protection provided.
Low maintenance -- Once installed there is very little maintenance required.

Burns Home Improvements

The Asphalt Roofing Manufacturers Association has more information. SPF Roofing is a company that specializes in roofing.A commercial spray foam roof can last forever if put in place and maintained correctly. There are a number of other benefits to SPF roofing systems.

SPF provides air, thermal and moisture barriers, resulting in the highest R-value at 6.6 per sq inch.
It is durable -- The foam material can expand and contract in the course of construction. This reduces the chance of splitting and cracks. likely. SPF is sturdy enough to walk on with a compression force of 50 PSI per square inch.
Seamless and waterproof -- The seamless solid surface is waterproof and has no seams or joints, so leaks are kept at the safest areas.
It's environmentally friendly. The majority of roofs are lightly raked. This eliminates the need to tear down costly roofing. SPF roofing materials are environmental green. They do not contain ozone depletion poten (ODP) and are free of volatile organic compound (VOC) as well as no chlorofluorocarbons, and have a very low global warming potential.
It's simple to repair The process of identifying areas that need attention is easy. Be sure to look for any imperfections in the paint. All you have to do now is clean and dry the surface, then fill in the crack with coating and smooth the area.
Installation speedy - Only saturated areas of the roof need to be removed and replaced at the time of installation. This helps save both time and money.
Water is unable to move laterally, thus if a break appears there is a chance that the water remains in the foam. Water cannot travel further because of the closed-cell nature foam.

Disadvantages:

Although roofs built-up are well-known as durable, they can only be used for as long as their roofing is in good condition. The other disadvantages of built-up roofing systems include:

Time - Installation can take longer.
It can produce dangerous gas and vapours when it is installed.
Weight - This can increase the structural strength of a building.
Costs - More expensive put up than a spray foam roof.
UV Rays -Without the gravel's top layer, UV rays could quickly degrade the membrane.
It's difficult to locate leaks in a roof that is covered in gravel and stones.
Lets Water Move Laterally - Water can travel further through the insulation, creating leaks all over the structure.

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