How To Convert A Flat Roof Into A Pitched Roof

How To Convert A Flat Roof Into A Pitched Roof
  • Author: Amanda Arnold
  • Posted On: December 3, 2021
  • Updated On: August 21, 2023

While a flat roof has numerous advantages, there are instances when you may want to convert it to a pitched roof. Is this something that can be done, and what are the typical steps?

The best way to approach a project like this is to understand what you’re up against, so let’s take a look at how this conversion is typically done. If you reside in or own a business building with a flat roof, chances are it was done on purpose.

However, everything is possible in construction! Even if you simply prefer the aesthetic of a pitched roof, there may be compelling reasons to change the pitch of your roof. With all their visual advantages, flat roofs can also have some major drawbacks. Water damage and mold concerns are more common on flat roof surfaces.

Not to mention that you’ll have to replace your flat roof more frequently and keep it waterproof with sealants and coatings.

Reasons To Convert The Flat Roof Into A Pitched Roof

One reason you might want to learn how to make a flat roof have a pitch is that you want to improve your roof’s aesthetic appeal. Pitch roofs come in a variety of shapes and sizes. Not only that, but you have a variety of materials to pick from like asphalt and wood shakes.

However, apartment complexes and traditional-looking businesses are the exceptions to the roofing style and appeal for commercial properties. Converting a flat roof to a pitched roof may not be possible if you have a high-rise structure.

Get Rid Of Water Damage

There are pros and cons to flat roofing systems. Some property owners are plagued by leaks, which is one of the downsides. Flat roofs are more prone to ponding water than sloped roofs. After it rains, water on a flat roof weakens the material. Water seeps into the structure over time. You might be asking yourself why some flat roofs leak.

One explanation is that their pitch is too low. Building owners who aren’t careful are more likely to choose roofing contractors who design their roofs incorrectly. It’s also possible that the materials they utilized were of poor quality.

We can see how important quality artistry and materials are in this case. Aside from style, we said that some property owners enjoy experimenting with different materials. One reason to choose a classic sloped roofing material is to save money on electricity.

Process To Change The Flat Roof Into A Pitched Roof

The procedure for converting a flat roof to a pitched roof is unique to your structure and demands; there is no one-size-fits-all solution.

To save money on removal, some people prefer to maintain their present flat roof on their structure underneath the new pitched roof. Others, however, may not contemplate this choice since their structure cannot handle the weight of two roofs.

Determine The Roof Pitch

First and foremost, roofing contractors take the appropriate measures to ensure that they know where the new roof’s peak will be located. Contractors will estimate the task after measuring your current flat roof. This covers the cost of the materials.

The first stage is to determine whether or not the present flat roof will be kept or removed. While keeping this area is less expensive, we must keep in mind that a vaulted or cathedral ceiling will not allow you to maximize the amount of interior space fully.

Install Roof Sheathing

Roofers must then remove all existing roofing materials, including internal elements, from the roof. They’ll install the new roof trusses while keeping the proper attachments in mind. If the previous roof sheathing is in bad shape, some roofers will replace it. It’s also possible to repurpose existing sheathing that’s in good condition.

Install Slopped Roofing System

Finally, your commercial sloping roofing system is installed by your roofing crew. You can now benefit from a brand-new roof and all of its features. Make certain to inquire about material options with a roofing company. Pitched roofs take more time and effort to install, especially when making a large structural change.

New roof trusses and supports are required for a pitched roof. Any wood that has been damaged must be removed and replaced. After taking measurements, a contractor can either build new trusses on the spot or order them pre-assembled.

Calculating the cost of the essential supplies will be a part of the process of adjusting the pitch of your roof. You will also select your new roofing material, which will differ significantly from the materials used to cover a flat roof.

Cost Is The Main Factor To Consider

Even if you’re hooked on the concept, any major roof work comes with a price. Significant roofing remodels are more than simply the roof.

Thus the new roof itself might be costly. Siding and any existing chimneys or HVAC lines will need to be extended up into the new eaves. It’s tough to estimate the expenses of a job like this because they vary so much based on location, season, and current material costs.


Working with the appropriate roofing company will help you avoid headaches and issues with a flat roof. Whether you need a new flat roof installed or a repair, pick professionals who have your best interests at heart.

Both flat and pitched roofs have numerous advantages and downsides. Converting a flat roof to a pitched roof is fairly typical, and you’ll almost certainly need to get planning permission first.

You may rest assured that your roof will be sturdy, beautiful, and watertight for many years to come if you hire a professional contractor. The easiest way to slope a flat roof for drainage is to use a good contractor.

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Author: Amanda Arnold

Amanda has been working with ConstructionHow since 2021. Her experience spans over 5 years in the creative niche such as home decor and trends, landscaping, renovations, and custom architectural values. As a home designer expert, she has a keen eye for the latest home improvement trends with accurate facts that readers find impossible to ignore. Being invested in home-building trends is how she has gained her lucrative expertise exploring more to bring a positive ambiance for all homeowners (and even tenants!). Currently, she lives in a beautiful beach home, a source of fascination for her.