Things to Know about Water proofing Your Flat Roof

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If you are searching for a trusted roofing company in Los Gatos, then you should contact Dickerson Roofing. Now, let us understand the things you need to know while waterproofing your flat roof.

Inspecting Your Flat Roof

The first step to waterproof your flat roof would be to inspect your roof thoroughly to find out the issues that are causing leaks.

Most leaks can be repaired and do not require a full roof replacement. So, you can go with patching and repairing your damaged roof instead of replacing it entirely.

You need to identify the spots where you are facing leaks. If you do not know how to inspect your roof for leaks, then you can take the help of a professional roofer in your location.

First, you should make sure that your flat roof is safe to walk or do roof inspection or repair. You should secure your ladder to ensure safety while climbing on the roof.

You can go with professional waterproofing if you lack knowledge about the same. They take safety precautions and use right tools for doing a roof inspection safely.

Spot Flat Roof Damage

You can check for holes and cracks to identify that your roof is damaged. Then, you can search for possible signs of roof leaks so that you can waterproof it accordingly.


Blistering develops under the surface of your flat roof and looks like pockets of trapped air form.

They can be of any size and looks prominent in warm weather. So, you can patch them first if you notice them bursting. This will help protect your roof from leaks.

Water Pooling

If you are facing heavy rain in your location, then you can notice water pooling on your roof. So, you can address this issue by hiring a professional roofer in your location.

Cracks and roof damage

If you notice cracks on your roof, then that can be because of debris, standing water, or UV rays. These factors cause cracks on your roof’s surface and damage them gradually to create roof leakage issues.

So, you can waterproof these cracks to protect your roof from any further damage.

Why you should maintain your flat roof?

Flat roofs often face issues of standing water after a heavy rain you’re your location. This happens because of clogged drains that you should inspect to protect your roof from damage.

If you neglect this issue, then it can become worse over the time. Remove the dust and debris that creates clogging in the gutters. Remove algae and moss from your flat roof to keep it clean; this will help free flow of water instead of water pooling.

How To Waterproof Your Flat Roof

You should consider a few factors while determining what type of waterproofing is required for your roof, which include:

  • Size of your roof
  • Budget
  • Your roof structure
  • Local environment

There are three types of waterproofing method that you can consider for your flat roof.

Liquid Waterproofing

Liquid waterproofing is done by applying a coating that weatherproofs your flat roof. This is convenient for any type of roofing.

Liquid waterproofing can last up to a very up to a very long time. If you have done it with the help of a professional, then it can last for about 20-40 years. However, you have to maintain your roof to have the luxury of this waterproofing for such a long time.

Reinforced Bitumen Membranes

This is the most common type of waterproofing method used for flat roofs. It involves bonding of 2-3 layers of the membrane, where the layers go across the whole surface of the roof.

Then, a polyester carrier with a coating is used to create waterproofing. To attach this waterproofed bitumen, your roofer will pour hot bitumen at the front to seal the roof’s edges.

However, you can use a cold adhesive to attach the materials to your flat roof.

Single-Ply Membranes

If your property is large, then you should use this method of waterproofing on your flat roof.

You can install the sheets across the whole roof if required. You can waterproof your flat roof by using techniques like ballasting, adhesion, and fastening.

You can screw the plastic fasteners into the single-ply to attach it to the roof deck.

On the other hand, stone ballasts can only sit on top of the sheets, knitted together so that they remain stable.

The adhesion method can be done by using polyurethane to secure the single-ply and the insulation.


You can waterproof your roof by using one of these methods. However, you have to choose the right method based on the extent and type of damage you have in your roof.

You can also hire a professional roofer to waterproof your flat roof. Roof maintenance is the key when it comes to the longevity of waterproofing you have done on your roof.

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