Flat Roof Construction Types You Should Be Aware Of

Various flat roof constructions are available for your residential or commercial needs. These include modified bitumen, single-ply membrane, and EPDM.


Choosing the correct type of insulation for flat roof construction depends on several factors. This includes climate, type of roof, and space available to lay insulation. Low-quality insulation can cause temperature fluctuations inside your home, increasing heating and cooling expenses. It can also reduce the lifespan of your roof, improving repair and replacement costs.

Insulation is a vital component of the roof and helps control the temperature inside your home. It protects your home by blocking the warm moist air from meeting the cold air layer. In addition, it prevents cold and wet air from entering your home. It also prevents excess heat from escaping your home.

Insulation is applied inside or outside the roof. It can be adhered, mechanically fixed, or loosely laid. It must have the correct compressive strength and sizing.

In addition to the insulation, flat roofs are typically built with a deck (typically made of wood in residential construction), a vapor barrier, insulation, and a roof board that is nailed to joists that support the deck. The materials you use will then depend on the flat roof system you select that will be needed for the flat roof construction st louis county mo, in case it needs a fix.

Modified Bitumen

Modified bitumen roofing offers several benefits among the many types of flat roof construction. It is inexpensive, offers excellent weather resistance, and is fire-resistant. Also simple to install, is it. And it typically has a lifespan of 20 years.

Modified bitumen roofing is commonly installed over a solid layer of insulation. Using a torch-down method, the membrane adheres to the substrate. It can also be heat welded or self-adhered.

Modified bitumen roofs can also be coated with cool roof coatings to improve lifespan. They are resistant to ultraviolet rays, which can damage other roofing materials. But they need to be cleaned at least once a year.

A thick layer of insulation also keeps heating and cooling losses from occurring. It also helps to prevent moisture build-up.


If you are installing a new flat roof or changing an existing one, you may be interested in implementing EPDM flat roof construction. EPDM is a long-lasting roofing material suitable for commercial and residential applications. It is easy to install, durable and low-maintenance.

If you have an existing EPDM roof, consider installing a vapor barrier to prevent condensation from forming. You can use a self-adhesive vapor barrier or PU Adhesive Battens. The vapor barrier will prevent cold bridging and eliminate water stains and ponding.

You can also ballast your EPDM roof system with stone, giving it a more polished look. Ballast can also help protect the membrane from the sun’s glare, tree branches, and hail.

Single Ply Membrane

Roofing systems made with single-ply membranes offer several benefits to building owners. These include durability, flexibility, and ease of installation. They are also fire retardant, resistant to punctures, and 100% UV resistant.

Single-ply membranes are made of flexible sheets of synthetic polymers. These sheets can be chemically adhered to insulation or ballasted. They are ideal for various roof types, including low-sloped, exposed, and cool roofs. They are also a good choice for retrofitting roofs.

Several single-ply membranes are available, including synthetic rubbers, thermoplastics, and polymer-modified bitumen. Thermoplastic polyolefin (TPO) is the most common material used in single-ply membrane roofs. It is a synthetic material made from bitumen and polymer additives. These additives make it softer and more pliable than other rolled rubber roofing materials. TPO is usually white in color, and it has a naturally reflective surface.

Cold Roof Deck

Generally speaking, cold deck construction of flat roofs is not recommended unless it is needed for safety reasons or is absolutely necessary. However, if you want to upgrade your roof’s thermal performance, there are some advantages to using a cold deck construction.

The first advantage is that the air in the cold deck cavity is outside air. This reduces the humidity of the roof and results in lower room temperatures. This also allows for higher ceilings.

Secondly, the air in the cold deck cavity is warmer than in the above room. This helps to keep snow from melting immediately. And finally, the stern deck is much lower in height than a standard roof. This reduces the chances of ice dams. The downside is that condensation can occur. Condensation can lead to timber decay and damp ceilings.

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