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Flat Roof Materials Solutions Guide - Need A Flat Roof? - How Do You Decide?

There is a great variety of roofing materials offered to the homeowners. This makes people debating on the solutions for the flat or low slope roof.

If you distinguish something about source, benefits and drawbacks of each type of material, it will help you to make better choice. Pay attention to your needs, finances and be sure to sift through the often confusing stack of proposals.

In order to promote some roofing materials, producers place their own proprietary names on them. The general categories of commercial low slope or flat roofing system are the first step that should be made in order to make the process of comparison and recognition of the goods easier.

Single Ply Roofing and Multiple Plies

We will look at TPO, PVC, BUR, modified, cold process and EPDM.

Built Up Roof

What do you think is the oldest form of commercial roofing? It is the asphalt built up roof composed of multiple plies. Nowadays it is the lower cost material, as the asphalt is being relatively inexpensive in comparison with polymer blends.

As to fiberglass felts, they are used between mop applied layers of hot asphalt. A good side is that the surface is protected with a mineral granule surfaced cap sheet, or a layer of gravel or pumice slag to protect from UV and aid water dispersion and evaporation.

The dominant limitation of BUR is characterized with the oxidized asphalt which is considered to be an inherently brittle material. It is easy to see this in a case the roofers use an ax to break the keg into chunks to fit into the kettle for heating. If the temperature is too high or too low, the roof life is being compromised. If you prefer to set the economy grade, then three ply fits well, still four ply is better. In order to add flexibility at roof details, use modified flashing cements or membranes, as well as pipe flashings and drains. So it means to lead flashings at extra cost.

Modified Membrane Roof

It is interesting to know that modified membranes cause the inherent inflexibility of hot asphalt by adding polymer modifies in the manufacturing process.

Two general types made of plastic and rubber is distinguished. They are called APP and SBS.

Materials with the help of polyester reinforcement are allowed to be bent and formed into flashings. The main characteristics of those materials are that APP membranes are heat welded, SBS as a rule are connected with hot asphalt. SBS complies better in freeze thaw cycles. What concerns APP - more in hotter areas having higher UV resistance.

Cold Process Cool Roofing

What material can be used by cold process roofing? In this case, water based colloidal suspension of asphalt mixed with clay to form a waterproof layer that prevails flexible for the reason, it is not heated during producing or installation. To achieve a cool roof rating it is necessary to use reflective polymers.

PVC Roofing

The main characteristic of PVC or poly vinyl chloride is to rely on plasticizers in order to create a flexible material. One more option of PVC is that plasticizers can migrate out of the material over time and moreover, causes it to revert to the unprocessed fragile state.

It is worth to admit that it has passed about 30 years since the time, these materials have become comparatively stable nowadays. The width of the material is measured in mils or thousandths of an inch. It is a factor of longevity, so an 80mil sheet will last longer and cost more than a 40 mil.

TPO Roofing

There exists a newer type of roof material. TPO is a modern answer to PVC and is produced without plasticizers. As a result the material is less flexible initially but there is no risk of plasticizer migration.

It should be admitted that PVC as well as TPO are thermoplastic. This means that they are allowed to use heat welded seams where the material can be softened and welded with hot hair and pressure. Additives are needed to impart fire steadfast and UV steadfast. It happens that lower cost manufactures are not rich on formulation.

The EPDM Rubber Roofing

The most original and chemically resistant rubber roof is EPDM. EPDM is a thermoset, which means, it cannot use welded seams. It is necessary to glue the seams with adhesive or butyl seam tape.

The material has the function to huddle slightly with age that is why it is important to secure fasten the perimeter flashings. Good adhesion may be achieved by keeping everything clean and free of contaminants.

If you distinguish different types of flat roof materials as well as solutions, you will definitely be allowed to evaluate the best roofing material for your project.

This brief of introduction will influence your decision. Pay attention on the number of conditions, offered in the given text. It is necessary to weight mechanically fastened against fully adhered systems, insulated against non-insulated, decide the best way to handle flashing details and certain conditions of your building. It may definitely influence cost of transporting materials to the roof work area and design solutions to address incomplete drainage or their issues specific to your buildings.

December, 2016 Posted by Vivien Sand