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Steel roofs are extremely popular today because of all of their attributes, including the fact that they are recyclable at the end of their lifespan. While you have been reading and learning about the benefits of these roofs, you probably have come across advice that states to remove your old roof shingles before you switch the steel roofing, and you may wonder if this fact really is true. The short answer is ‘maybe’ but there is more to it than this quick answer. It also depends on the following.

How Old Is Your Shingled Roof?

You need to remove your old roof shingles if the shingles are at the end of their lifespan. Asphalt shingles only last up to 20 years at most. After this, they begin to crack and break which means that if you leave them under a new steel roof that they will diminish the integrity of the roof’s structure.

Are the Shingles in Bad Condition?

In the event that the shingles are still in ideal condition, it might be fine to leave them to apply the steel roofing over them. However, this also may depend upon what profile of steel roofing and if leaving the shingles would interfere with the quality of its installation.

Do You Need Additional Support for Your Steel Roof Than What Is in Your Old Roof?

There is no other choice but to remove the old roof shingles when you need extra support for your new steel roof in comparison to your present roof. The roof sheathing has to be able to support the steel roofing in a sturdy fashion for you to receive a quality roof installation.

Are There Already Multiple Layers to Your Roof?

When your present roof already contains two layers of roofing, you will need to remove all of the old shingles to install the metal roofing. Three layers of roofing materials is just too much for the sheathing to support along with other determining factors.

Is the Sheathing under the Shingles Warped or Cracked?

Sheathing supports the roof materials along with the roof rafters. If it is warped or cracked, the shingles will need removing to make way for new sheathing prior to the installation of the steel roofing.

Remember that in comparison to asphalt shingles, steel roofing lasts far longer for a greater return on your investment. For further reasons that you should get rid of your old roof shingles and switch to steel roofing, consult with Johnson Roofing. We are experts in all aspects of roofing. Our company delivers quality results at affordable prices.

Expansive commercial roofs pose a challenge when it comes to selecting the right roofing materials to protect them sufficiently over the years mainly due to their lack of pitch. While there are numerous different materials that will be adequate for the task, steel roofing outperforms some of them and therefore, is one of the popular choices today for these roofs. Refer to the details below to learn more information about why steel roofing is ideal for an expansive flat commercial roof.

Longevity of the Steel Roofing

The prime reason to turn to steel roofing for a large flat commercial roof is that it lasts for up to 70 years. In comparison, asphalt tiles last 20 years max usually. Therefore, asphalt tiles are not recommended for this type of roof since you will need to replace the tiles at least twice, if not three times, to just one steel roof. This means that the asphalt roofs can wind up costing more over the years than investing in a durable steel roof.

Flexibility of Design

Since there is a wide assortment of profiles for steel roofing available today, you have flexibility of design with it for your expansive flat commercial roofs. Each profile provides a slightly unique appearance to your roof.

Low Maintenance Requirements

Steel roofing is easy to clean and requires low, if any, maintenance throughout its lifespan. You should keep a steel roof as free of debris as possible to prevent organic elements from damaging it. However, this is easy to do since elements do not adhere to steel as readily as they do with other roofing materials. If a repair is required, it is quick and easy to perform as long as it is a minor issue.


Another benefit of steel roofing is that you can recycle it when it is time for a new one. Also, your new steel roof will contain a certain amount of recycled steel. This recycling reduces the need for raw ore and the excessive energy it takes to process it into steel.

Steel Roofing Is Safe and Energy Efficient

An additional reason to install steel roofing on your large flat commercial roof is that it is fire resistant and ideal even in fire-prone areas. On top of this, steel roofs are energy efficient and can reduce your cooling costs up to 25 percent.

For further details about the reasons that steel roofing is ideal for an expansive flat commercial roof, consult with Johnson Roofing. We will analyse your roofing needs, provide you expert guidance and present you with a personalised, accurate quote.