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Which is Best for a Flat Roof?

Nov 9

A flat roof is a roof that covers a business. You might imagine black tar being spread across it. There are many options available to meet your pricing and performance requirements.

How does Spray Polyurethane Foam differ from "conventional" roofs?

Roofing Systems wants its clients to be informed. To help you make an informed decision about the best roof for your company, we have written an essay comparing built-up and SPF roofing systems.

  • Tar and Gravel roofing

Built-up Roofing Systems have been used in the United States for more than 100 years. These roof systems are also known as "Tar and Gravel" roofing. Layers of asphalt or tar are applied directly to a roof to create a built-up roof. You have the option to choose how many layers or plies you wish to put on your roof. Stone or gravel is used as the final layer on a roof structure.

Spray Polyurethane Foam Roof Spray (SPF). Polyurethane foam can be sprayed on an existing roof. It expands into foam and forms a solid layer.

While SPF roofing is not the most common type of roofing material it has been used for industrial, commercial, and residential buildings since at least the 1960s.

Installation of Spray Polyurethane Foam Roof


A roof that has been installed

A typical business roof cost will range from $5.50 to $8.50 per sq. foot in labor and materials. This range may vary depending on the materials you choose.

SPF Roofing - This is a roofing company.

An SPF roofing system will cost between $4.00 and $7.00 per square foot for a typical business roof of 20,000 square feet. Materials and labor are included in the price. This price range assumes that the SPF roofing system is of average thickness and the structure of a building.

Spray foam roofing is an economical way to save energy over 5-10 years.


Roofing System installed an SPF roof at the Parma Ice Rink Building.

The roof substrate can be attached directly to the first layer. The roof substrate can adhere directly to the initial layer.

The last layer is made from rock or stones and protects the layers below it from extreme heat or cold, ultraviolet rays, wind damage, and extreme temperatures. To make the roof look more appealing, a gravel coating may be applied.

The contractor Burns Home Improvements will not remove the entire roof. Instead, he will focus on the areas that are most saturated. The contractor will clean the substrate with a roofing contractor in Lebanon Pa.

The contractor will lay the first layer of polyurethane foam. The contractor will lay the polyurethane foam as the first layer.


A commercial-built-up roof can last for up to 40 years if it is properly installed and maintained. Other benefits are also offered by built-up roofing systems:

  • Waterproof and seamless -- The continuous, solid surface is impenetrable and completely waterproof. This prevents leaks at the most vulnerable places.

  • UV Rays are Reflected -- UV protection provided.

  • Low Maintenance -- After installation, very little maintenance is needed.

More information is available at Asphalt Roofing Manufacturers Association.

SPF Roofing - This is a roofing company.

A business spray foam roof can last many years if it is properly maintained and installed. SPF roofing systems also offer other benefits.

  • The highest R-value has is 6.6/sq inch. This means that it provides thermal, air, and moisture barriers.

  • Durable -- Foam material can expand or contract during construction. This makes cracks, splitting, and expansion less likely. SPF is strong enough to be used for walking due to its compressive strength of 50 PSI/square inch.

  • Waterproof and seamless -- The continuous, solid surface is impenetrable and completely waterproof. This prevents leakage at the most critical locations.

  • It's environmentally friendly - Many roofs can be lightly raked which reduces the need for expensive roofs to be removed. SPF roofing materials are very environmentally friendly. They are extremely low in global warming potential and have no ozone depletion potential (ODP), the volatile organic compound (VOC), or chlorofluorocarbons.

  • It's easy to fix -- You can easily find areas that need attention. You should keep an eye out for any paint imperfections. Dry the area. Next, apply a coating to the crack. Finish by smoothing the surface.

  • Installation is quick - Only saturated areas need to be removed and replaced during installation. This saves money and time.

  • Water cannot travel laterally. Water cannot travel laterally. Because of the foam's closed-cell nature, water cannot travel any further.

There's a downside to

Built-up roofing systems are known for their durability but they cannot be used as long the roof is in good condition. There are also some drawbacks to built-up roofing systems.

  • Installation can take longer.

  • When it is installed, it can release dangerous gases and vapors.

  • Increased Weight - This will increase the structural weight of a structure.

  • Costs of installation - A spray foam roof will cost more than a traditional roof.

  • Ultraviolet Rays -- The membrane can be rapidly damaged by UV rays that are not reflected from the top layer of gravel.

  • A roof that's full of stones and gravel can make it difficult to spot leaks.

  • Allows water to migrate laterally Water can move laterally through insulation, causing many leaks throughout buildings.