Technical Aspects of EPDM

Elastomeric coatings are roofing applied in a viscous state. It has elastic properties, and can stretch in the summer time heat and then return to their original shape without damage.

Elastomeric coatings usually contain polymeric materials, such as acrylic, and a white pigment, such as titanium dioxide, to make them opaque and reflective. An elastomeric coating is applied thicker than paint. An elastomeric coating can be used on virtually any substrate including asphalt built-up roofing, concrete roofing, metal roofing, modified bitumen roofing, polyurethane foam roofing and single ply roofing.

Since EPDM Liquid Rubber Coatings cures by chemical reaction, a single heavy application will be preferable to multiple thin coats. A second coat will bond to a previous film but that bond will not be as strong as the internal bond within each layer. If a second coat is applied before the first has thoroughly cured, some wrinkling may result as the first coat absorbs solvent and swells. This will, however, recover as the solvent evaporates. It is generally recommended that only a single coat be applied over non-porous surfaces, the thickness of which can be varied as desired. Thicker films will take longer to cure through. Asphalt coatings and asphalt built-up roofs are considered unstable substrates and therefore, not recommended for coating directly with Liquid Rubber EPDM. EPDM COATINGS do carry a specific elastomeric which with a two coat application gives you a 10 year warranty.

Liquid Rubber is designed to re coat structurally sound existing roof and protective materials. They are also best for RV Roof Repair. They should not be used in place of roofing membranes”.

The following are recommended substrates to coat:

  • Metal – Coated or Galvanized Steel
    • Weathered Aluminum
    • Weathered Copper
  • EPDM Rubber membrane
  • Concrete (except foot traffic surfaces)
  • Urethane Foam
  • Primed Wood
  • Fiberglass
  • PVC Sheet and Pipe
  • Acrylic Sheet
  • Sponge Rubber insulation

Do Not use Liquid Roof or Liquid Rubber on the following substrates:

  • Built up asphalt roofs
  • Asphalt shingles
  • Modified asphalt roll roofing
  • Stainless steel
  • Glass
  • Silicone caulk
  • Foot traffic surfaces
  • Hypalon Membrane

Metal Roof Maintenance and Repair Tips

Metal roofs are generally long lasting which helps to explain their popularity. They are also good looking which is probably why we are seeing more of them on new homes.


All parts of the home need regular maintenance and occasionally a repair or two. A metal roof repair is no different. Here are some tips that will help ensure the roofs look good and last as long as possible.


Cleaning is necessary on occasion, especially if you live in an area with a lot of trees and leaves. A lot depends on the shape. If you have any crevices or flat spots, leaves and branches can get stuck in them. If you do not feel comfortable on a ladder, find a handyman or a roofing company that can take care of this issue for you.


Rain washes away most dirt and grime. But you might want to power-wash the roof every once in a while. Again, this is something that you can do yourself or hire a professional to do it for you.


Check for Drainage Issues: Rain keeps it clean but if puddles form on the roof, the water will eventually cause rust. You might have to get up on a ladder to make sure that rain is not pooling behind gutters or in other areas that are hidden from view. If you find serious drainage issues, you will likely need to contact a roofer to get suggestions. New gutters might solve the problem.


Touch Up the Paint: Touching up the paint on a regular basis will help prevent rust. Some brands contain polymers that are better at preventing rust on metal surfaces. But if it doesn’t match the color, you might not like the way it looks. Clear sealants or rubber coatings are other alternatives. The rubber coatings are a good idea if you are worried about leaks or if you currently have one and can’t seem to find the hole.


Check the Seams: Seams are the most common location for leaks. You can repair a seam or a hole elsewhere on the roof with roofing cement. If the hole is large, you may need to solder on another piece of metal.

Always be sure that the metals you use are the same type. If different metals touch each other, you have an increased risk of rust and corrosion. Even the screws should be of the same type of metal and washers should always be used.

With proper care and maintenance, your metal roof could last a lifetime. We hope the preceding tips were helpful.

Built Up or Modified BIT Roof Maintenance Suggestions

Built up or modified BIT roofs have increased in popularity for several reasons. A single ply is elastic and durable. No gravel surfacing or coatings are required making them less costly to install and maintain. Inspections are relatively easy and leaks are easier to find and repair than with many other kinds of roofing materials. Those are the benefits typically outlined by marketers and they are true for the most part as long as you do some preventative maintenance.


In truth, some of the materials that are covered with granules on the surface may need to be recoated after a few years due to loss of the granules. Regular inspections will reveal this problem.


Unless the roofing is new, it is a good idea to find out how long ago the material was put in place and to learn about the type of material that was used. Some materials last longer than others. The inexpensive single layer asphalt-impregnated materials have a relatively short lifespan of less than 15 years. Other materials can last as long as 20 years if the weather in the area is not too severe.


Once you find out how long ago the BIT roof was put in and you learn about the materials that were used, you can plan for regular inspections. You can do the inspection yourself or let your roof maintenance crew handle it. Flat and low slope roofs should be inspected twice a year. Steeply sloping roofs should be inspected yearly but the drainage system should be inspected at least twice a year.


In most areas, inspections should be done in the spring after the harsh winter weather is over to assess any damage done by melting ice or heavy snow. The second inspection should be conducted during the fall to reduce the risk of snow damage or winter leaks.


In addition to assessing granule loss, there are several things to look for. Cracks and gaps between the sheets can eventually lead to leaks. It saves money to repair the cracks and close the gaps before a leak occurs. Crazing is a precursor to cracking. It might not be necessary to do a roof repair until the next inspection but it is a good idea to plan to make a repair as soon as possible.


Preventative maintenance will allow you to get the most out of your built-up or modified BIT roof. The time that you spend planning for and doing the inspections is time well spent.