What is a ballasted roof system?

A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. … The stones used in ballasted roofing are generally 1.5 – 2.5 inches in diameter and applied in a thicker layer. The stones are therefore much more substantial and hold up well under wind tunnel tests.

How long does a ballast roof last?

Along with gravel and stones, these materials are used to ballast felt, rags, paper, and membranes on a commercial roof. A typical ballasted commercial flat roof should last on average 20-25 years before it requires to be replaced.

What is ballasted EPDM?

WHAT IS BALLASTED EPDM? A ballasted EPDM roof system has its components held in place by river-washed stones or pavers. Bal- lasted roofs are loose-laid, meaning roofing materials, including the insulation and roof membrane, are not fastened to one another or to the roof deck.

What is a ballasted membrane?

Popular for large-scale retail stores and warehouses, ballasted systems feature a loose-laid membrane held in place by stone or pavers. The ballast helps to shield the membrane from inclement weather and extend the life of the roof.

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How much is a roof ballast?

Most roofers typically installed 10-15 pounds of ballast per square foot.

Why do roofs require ballast?

Single-ply roofing materials aren’t self-adhered, nor are they sealed together in any way. Since nothing secures the waterproofing membrane to the roofing materials underneath, ballast is needed for weight to protect the roof from strong winds. … The heavier stones provide substantial protection against wind gusts.

What is a membrane roofing system?

Membrane roofing is a type of roofing system for buildings, RV’s, Ponds and in some cases tanks. It is used to create a watertight covering to protect the interior of a building. Membrane roofs are most commonly made from synthetic rubber, thermoplastic (PVC or similar material), or modified bitumen.

What is TPO roof system?

What is TPO Roofing? Thermoplastic Polyolefin is a single-ply roofing membrane that is one of the fastest-growing commercial roofing systems on the market. TPO roofing systems are made up of a single layer of synthetics and reinforcing scrim that can be used to cover flat roofs.

What is the difference between reinforced and non reinforced EPDM?

EPDM is available in both black and white and is sold in a variety of widths and thicknesses. Non-reinforced EPDM membranes do not have a reinforcement scrim and are designed for use in adhered assemblies.

What is a single-ply membrane roof?

Single-ply is wide width sheeting meant for low slope roofs.

Single-ply roofs have far fewer seams than asphaltic rolled roof systems and don’t require dangerous torches or hot asphalt for installation. They also come with prefabricated detailing accessories that make installation easy.

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What is PVC roofing?

PVC is a high quality, durable option for commercial roofs. … Made from polyvinyl chloride (or in layman’s terms, plastic), PVC is a great single-ply roofing solution. It’s made from a lower percentage of oil and petroleum than thermoplastic polyolefin (TPO) or ethylene propylene diene terpolymer (EPDM).

What is a green roof system?

A green roof is a layer of vegetation planted over a waterproofing system that is installed on top of a flat or slightly–sloped roof. Green roofs are also known as vegetative or eco–roofs. They fall into three main categories—extensive, intensive, and semi–intensive.

Can roofs be flat?

A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10°. Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof.

What is an inverted roof?

Inverted roofs have their waterproofing layer beneath the insulation instead of above it as in other forms of roofing. … Inverted roofs are designed with the waterproofing layer, usually a liquid-applied membrane, beneath the insulation.

What is a ballast block?

Take the humble ballast block—this seemingly simple piece of concrete that holds down a flat roof mounting system can lead to a lot of questions about weights, dimensions, and materials. Since finding and placing the blocks is the installer’s responsibility, it’s a common and sometimes last-minute concern.

How long does a membrane roof last?

A typical commercial flat roof membrane should last on average 20-25 years before needing to be replaced. On the shorter end it could need replacing in 10 years, and on the longer end, it could last even 50 or more years.

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