waterproofing flat roof

Waterproofing Flat Roof: 4 Tips From a Professional Roofer

Flat roofs are very prone to water ponding because of their structure, and this can lead to irreversible damage to your flat roof. It is indeed true that prevention is always the best, and you can waterproof your commercial roof to prevent this.

Before you go with waterproofing flat roof, I have gathered some of the best tips that I can share with you. These tips came from my experience in the roofing industry, and there are several factors that you have to consider before starting your waterproofing membranes installed. Let’s take a better look at these tips!

What Are the Types of Flat Roof Waterproofing?

commercial flat roof

Before we talk about the top essential tips that you need to know, let’s talk about the most common types of flat roof waterproofing:

Liquid Waterproofing

This involves the use of waterproof coatings that are applied as a liquid and it dries out to form a solid, waterproof membrane

Reinforced Bitumen Membranes (RBM)

This type of flat roof waterproofing is one of the most popular options for commercial buildings. Reinforced Bitumen Membranes need to be applied for two or three layers before pouring the hot bitumen, which is the material that holds the materials to create a waterproof surface.

Liquid Rubber

If you’re up for a DIY waterproofing project, liquid rubber can be your choice. You can use this material for small and large flat roof surfaces, but you have to take note that this is not meant for quick fixes. It is usually recommended to be applied for newly built buildings. 

Single Ply Membrane

It is a single layer of flexible material, such as PVC, TPO, or EPDM roofing, that is applied to the roof surface as a continuous and seamless membrane.

[Read More: Top 3 Commercial Roof Waterproofing Materials]

3 Tips for Your Waterproof Flat Roofing Project

waterproofing flat roof

As a roofer with over 25 years of experience in the industry, here are the most important tips that I can share with you to ensure the success of your flat roof waterproofing project:

Make sure that you have the right tools and materials

If you’re about to do the flat roof waterproofing yourself, you have to get all the necessary materials and tools before you start with the project. You might need to look for sealants and patch kits, especially if you need to repair certain areas of your flat roofs. 

As for the waterproof roof membrane, you can have various options to choose from what we have mentioned above. In choosing the right waterproof membrane, you have to consider the climate conditions of your area. 

Small Details Matter

waterproofing flat roof

When I say details, I mean paying attention to the seams and edges of your roofing. It is always best to take some time to check every single corner of your roof and seal everything that needs to be sealed. Spending a little extra time for sealing areas that are prone to water pooling can lessen the chances of getting an emergency roof maintenance procedure.

Choose High-Quality Waterproofing Products

Your flat roofs deserve the utmost care and attention since it keeps your commercial buildings running smoothly throughout the year. Plus, it keeps you safe against all the environmental elements. 

That’s why you have to invest in high-quality waterproofing methods. Using materials from a reputable manufacturer gives you the assurance that you are getting the best out of each dollar you pay for your flat roof. It will also ensure the durability and effectiveness of your waterproofing system.

FAQs About Waterproofing a Flat Roof

How do you waterproof a flat roof?

Here is the most common installation process that you have to follow when you are to waterproof your flat roof:

  1. Clean the surface of the flat roof by removing any dirt and debris.
  2. Check for any damages like cracks, holes, and other damages that need repair before proceeding with the application of the waterproof material.
  3. Before proceeding with the waterproofing method, apply a roof primer to ensure that the liquid waterproofing material will adhere properly to the flat roof.
  4. Install the waterproofing membrane on the roof surface and ensure that it is properly sealed at all seams and edges.

What is the best waterproofing for flat roofs?

The best waterproofing material for a flat roof depends on several factors such as location, climate, roof traffic, and budget. Speak with a licensed roofing company to determine the best option for your commercial building

Can you seal a leaking flat roof?

A leaking flat roof can be sealed. There are several easy steps that you can follow to seal your flat roofing. First off, you have to identify the source of the leaks, it can be by checking the flat roof surface for any cracks, holes, or water ponding. Next, you can now apply a sealant on the roof deck. 

You may apply a silicone or rubber-based waterproofing sealant to the cracks and holes of your flat roof. Just make sure to follow the instructions that come with the packaging of the sealant if you are doing this by yourself. 

How much does it cost to waterproof a flat roof?

On average, the cost to waterproof a flat roof can range from $1 to $4 per square foot for a basic installation, with the total cost ranging from $500 to $2000 for a standard coating.

Waterproof Your Flat Roof With a Professional!

flat roof

Easy Roof Solutions is ready to take the challenge of waterproofing your commercial building’s flat roofing structure. Call us today for a free estimate.

About the Author
Kenneth Byler Easy Roof Solutions

Ken Byler

Founder of Easy Roof Solutions, LLC. He started in the construction industry at the age of 14 and has been involved in it for over 25 years. His wide experience in commercial roofing speaks for itself.

Outside his roofing work, Ken enjoys being in the great outdoors, traveling to new places, and bonding with his wife and children.

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