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Best Roofing Material for Flat Roofing

Flat roofing is not the most popular roofing method. Its unconventionality is that lots of homes in various parts of the world need steep roofs, making it possible for water to run off roofs very rapidly and not stagnate on the roof.

While lots of homes use steep roofs, flat roofing is a little popular in homes in arid regions. 

Why Flat Roofing?

The reason for this is simple. When building homes in arid regions, architects do not need to design a roof with the aim of preventing water stagnation on the roof. It seldom rains in arid regions and any water that makes it to the top of the roof evaporates with time. There really is no need for it to run off the roof rapidly.

Will you be replacing your flat roof anytime soon? If yes, you will need to know what the best roofing material for flat roofing is.

How To Get The Best Roofing Material For Flat Roofing?

When looking for a roofing material for flat roofing, you will have to take time to go through all available alternatives. Doing this is the only way you can get the exact roofing material that is best for you.

You must consider some things when selecting a roofing material that is most ideal for you are;

  • Timeline: How soon do you want the roof to get finished?
  • Budget: How much are you willing to spend?
  • Climate: What is the climate in your environment like?
  • Installer: Will you get a professional to install the roof or will you install it by yourself.

That being said, let’s go through some of the best roofing materials for flat roofing.

Metal Flat Roofing

There are quite a number of materials used in flat roofing. One of the most prominent of these materials is metals. Of the various metals that are used in flat roofing, aluminum is mostly used. This is because it has a reputation for lasting very long.

All things being equal, flat metal roofing can last as long as 35 years. In addition to being very durable, flat metal roofing has a reputation for reflecting the sun’s heat. This can go a long way in positively affecting energy costs.

When looking to purchase metal roofing sheets, you should be ready to purchase large sheets. While large sheets should be purchased normally, you are also free to purchase smaller sizes when looking to fix irregular parts of your roof.

Metal roofs have lots of advantages. They, however, are not free from disadvantages. They cannot be replaced in parts, as soon as they need to be replaced, the part that will be replaced has to be completely removed. It is impossible to install a metal roofing sheet on a damaged one without first removing the damaged one. That’s not all.  Metal roofing sheets can also get rusted. Once they rust, you have to replace them.

Built-Up Flat Roofing

Built-up flat roofs might be famous for being very attractive. There is, however, more to them. In addition to being beautiful, they are excellent insulators.

Built-up flat roofs come with several layers. Due to this, they are sturdy and can last a long time. While these many layers mean they are durable, moving them from one place to another might not be the easiest thing to do as they are heavy.

Built-up flat roof is always the perfect flat roof when replacing a built-off roof. However, if you are not looking to replace a built-off roof, it might not always be the best alternative. Due to this, before going ahead to replace a different flat roof with a built-up flat roof, you will get to seek professional advice.

Why is this so?

The simple reason for this is built-up flat roofs are heavy and if the existing roof is not a built-up flat roof, you might not have the right structure. The implication of this is if you must go ahead with replacing another type of flat roof with a built-up flat roof, you will have to work on the structure of the roof to ensure that it has the right type of support.

While needing extra support can be considered a disadvantage of using this type or flat roof, one other downside of using built-up flat roof replacement is that you will have to empty an apartment completely before it can be installed. This is because there are some dangers associated with its installation.


EPDM is made from recycled materials, is affordable and long-lasting. Due to the fact that it possesses these qualities, it is one of the most used alternatives so long flat-roofing is concerned.

When EPDM roofs are installed, they need seaming for installation to be carried out thoroughly. If seaming is not done, then the roof’s installation cannot be said to be absolute.

Due to the fact that the installation of EPDM roofs need seaming, there is a likelihood of a roof leaking if seaming is not properly done. To ensure that seams do not get damaged after a roof has been installed, you will need to spray the roof to prevent the seam from getting damaged.


PVC is gotten from a combination of ethylene and chlorine. The combination yields ethylene dichloride (EDC). This product gets processed to the vinyl chloride monomer (VCM). Furthermore, it gets polymerized to the vinyl resin.

When installing a PVC roof, you will have to work with a heat gun to ensure that you have the right seam strength. When you make use of a heat gun, you do not just have the right seam strength; you can be sure that the resistance of the material to wind and leaks will be increased significantly. After being installed with a heat gun, adhesives or screws are used in keeping it tightly sealed to the roof.

When used in making a flat roof, you can be certain that you will not need to replace the roof anytime soon as PVC is very durable. It can last as long as 20 years when properly maintained. That’s not all. It is resistant to the wind and pollutants.

Although there are certain advantages associated with the use of PVC in flat roofing, there are some significant downsides. 

The process involved in installing PVC is not exactly straight forward. It can be a little confusing for people that are inexperienced. Furthermore, the process involved in the manufacture of PVC is not a very favorable one to the environment.  It involves the release of dangerous chemicals into the environment. Finally, the chemicals added to PVC roofs to ensure that they are flexible might be a cause of problems after a 20 year period.

Modified Bitumen Flat Roofing

The result obtained from the use of modified bitumen flat roofing might be stunning. Nonetheless, the process that is involved in installing this type of flat roof involves some level of danger. This danger is even more pronounced when it is handled by someone that is inexperienced.

When looking to make use of modified bitumen in flat roofing, you will need a blow torch to get it installed to your roof. With this blow torch, you will not have so much challenge rolling modified bitumen on a roof.

Although there is a level of danger involved in installing modified bitumen, an upside of this material is it can be installed very rapidly. In addition to the ease with which it can be installed, this type of flat roof reflects heat efficiently.

GRP Fiberglass

This is made from a combination of chopped strand mat glass fibers and polyester resin. This blend usually results in a laminate. GRP fiberglass can be trusted to resist moisture. Due to this, if you need a flat roofing material in wet conditions, it is one material you will need to consider. Furthermore, it is lightweight and lasts a long time.

In addition to this, GPR Fiberglass does not have seams and joints, so, you will not have to worry about it leaking at a seam or a joint.

While this flat roofing material comes with lots of good qualities, there are certain downsides associated with its use. It can be a major cause of noise when it is raining. That’s not all.  It can only get installed when the weather condition is mild and dry. If it gets installed in a cold weather condition, it will fail to cure. Furthermore, if you are looking at roofing a large building, it might not be the most suitable alternative.

We do a lot of flat roofing projects in Arizona and primarily our Sedona Roofing Contractors do it.

How Much Will It Cost To Replace a Flat Roof?

The amount you have to spend when carrying out a flat roof replacement depends on the type of material you use.

While there is no fixed price when making use of any of these flat material roofing sheets, you will be spending the least per square foot when you use modified bitumen and the most when you make use of metal.


Well, you all have the choice to make among the available options presented to you. There’s no excuse not to have the best of materials for your flat roofing. Every flat roofing style presented here is excellent for you, but your preferences and budget are key factors to consider before settling for flat roofing.

Contact Behmer Roofing

Behmer is ready to take on your toughest roofing challenges. Located across Arizona, Behmer Roofing handles all projects from roof replacements, maintenance, new construction and commercial roofing. Contact us today for more information.