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Flat Roof Sealant Paint: Which Is Best?

The choice of roof sealant depends on the conditions to which the roof would be exposed and an individual's budget. With so many types to choose from, it can be hard to decide which one is right for your specific roofing needs. Here is an outline for enabling you to choose the best roof sealant.

How To Know The Best Roof Sealant

The best roof sealant offers you the best service for a long period. A poorly installed roof, lack of maintenance, and thermal movement are among the common factors that could damage your roof. However, the best roof sealant should reduce the damage caused by these factors. The best way to know the best roof sealant to use is by considering the following factors.

Ease to Install

As mentioned above, poor installation is among the leading factors for a damaged roof. Therefore, when choosing a roof sealant, the best ones are easy to install. They would minimise the challenges experienced during the installation process and reduce the chances of leaks. The most simple sealants allow for just one coat of cold applied liquid to be applied. Once cured this can provide waterproofing for as much as 25 years.

Liquid roofing systems have become hugely popular. The reason for this is liquid-based sealants are the easiest to install and would likely offer you long-term reliable results. However, this does not mean that other types of sealants are bad for your roofing needs. The experience and knowledge of the sealant installation experts also determine the results you’d get. Before choosing a sealant, consult with your installation expert to ensure they have the knowledge to deliver quality work. The most experienced sealant installation experts would have minimal challenges installing any type of sealant. They would also suggest the best sealant that would guarantee you long-lasting results.


The best flat roof sealant should be able to withstand extreme weather conditions. It should also be able to protect your roof for a long time. Withstanding these conditions is necessary because you don’t want a sealant that would crack or peel after a short time. High-quality sealants that offer excellent versatility and strength would guarantee durability.

Most of the flat roof sealants come with good guarantees of between 10 and 25 years. For instance, you should consider the roof's activity to ensure the product can withstand. Roofs that experience a lot of traffic would require a different sealant from domestic flat roofs, which are rarely used. If you choose the wrong sealant for these roofs, you’ll likely require repairs sooner than you imagined.

When choosing a roof sealant, consult an expert to ensure you choose the best in the market. These experts know what's needed for different roofs, and therefore, their assistance is a guarantee of durability. Consider the expert's experience in the installation process, because if the sealant is poorly installed, it might not last long. Ensure a reputable manufacturer makes the paint to guarantee its durability.

Easy to Maintain

The best sealants are simple to maintain and don’t require special cleaning agents. They should also be durable and resist peeling or cracking after being exposed to sunlight for long periods. In such a case, you’d need minimal flat roof repair work during the maintenance process.

The maintenance costs incurred after an installation depend on how well the sealant was installed and its durability. If poorly installed, you are likely to spend a lot of time repairing patches or replacing the entire sealant. The only way to reduce your maintenance costs is by choosing the right sealant for your roofing needs and having an expert install it. Also, consider the weather conditions in your location because they determine the ease of maintenance of different flat roof sealants.

Resistance to Thermal Movement

The best flat roof sealants were tested by experts who know how well they resist temperature changes. This is especially important in the UK with a wide range between high and low temperatures (1). Some sealants are known to peel or crack whenever exposed to the sun's rays, due to having a restricted range of movement. If you live in an extremely hot climate, this factor should be the main consideration to ensure your roof sealant serves you for a long period. The differences in the highest and lowest temperatures during the day determine how fast the sealant will crack. Hence, getting a high elasticic flat roof sealant makes sure that it will serve you for a long period.

Roofing experts know the reliability of different sealants for varying weather conditions. Therefore, it is important to consult with a professional to ensure you buy a long-lasting sealant. You do not want to choose a sealant which will crack after the first few months of a new roof installation. In this case, your location is a major consideration.

Purpose of The Roof Coating

The primary purpose of any roof sealant is to provide a waterproof coating to the roof surface. However, the type of conditions it must endure are a major consideration when selecting the best sealant. Are you buying it for use on a commercial or domestic building? The roofs of these buildings are exposed to varying conditions, such as foot traffic and vehicles. You must ensure that the paint chosen is durable enough to withstand these conditions. Many people might not know what to look for when choosing a sealant for different roofing surfaces. For example, different primers may be required with a sealant on different substrates. An expert is your ideal solution if you are one of those people. These experts have a lot of experience in sealant installation on different roofs. Therefore, they know what would work best for your roofing needs.

Can I Apply A Roof Sealant Over A Failed Roofing System?

Yes, in most cases you can apply a roof sealant over a failed roofing system, this includes building suffering from cut edge corrosion. When used to completely encapsulate a failed roof this is called a liquid overlay. This is a very cost effective way to prevent the need for a full roof replacement.  When the sealant is applied for a roof repair to a small defective area this is known as a liquid patch repair (this process is so simply many people refer to this sealant as roof repair paint). In nearly every case a Pu liquid sealant is the best choice of sealant for patch repairs and overlays.

Do You Need A Flat Roof Sealant Paint?

When it comes to flat roof sealants, you’ve several options. These sealants are made of different types of chemical compounds. These sealants are widely popular in the market, and contractors have multiple options. Consult with professionals for more information about the best roof sealant for your needs. If you would like to talk to an expert about the right flat roof sealant for your project please get in touch using our contact form or call 01277 503110.