Roof Sealant 101: Main Types, Installation and Quality Standards

a man applying roof sealant with a spray bottle

Without a doubt, the roof of a house has protection as its main purpose. Any worthy roof is sealed and waterproofed in order to protect the structural integrity of the building against the weather. However, there are cases where the conditions make it a requirement to use something a lot more effective. Roof sealant is the most commonly used material for complete sealing. Because they tend to accumulate snow and water, it’s mostly used on flat roofs. However, there are special sealants for sloped roofs. When properly used, this material is capable of making any roof completely leak-free.

What Is Roof Sealant?

The basic function of sealant is to block the passing of fluids through openings in different surfaces. A type of mechanical sealant, roof sealer is applied as a coating agent that becomes a protective film when dried. Despite not having great strength, the sealant has several properties for added protection. Apart from weatherproofing, it provides thermal and acoustic insulation. To a degree, they also serve as fire barriers. Additionally, they can be used for simple filling and smoothing. There are various types of roofing sealants, all with advantages and disadvantages.

The Main Types of Roof Sealant

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1. Asphalt Roof Sealant

Featuring a mix of additives used to make the material more resistant, sealant for asphalt roofs is a quick-dry emulsion that’s very effective.

2. Sealant for Metal Roofs

Made of high-performance elastomeric, this coating is formulated especially to protect metallic roofs.

3. Rubber Roof Sealant

Easy to apply and effective, sealant for rubber roofs is one of the most demanded sealants. Its only disadvantage is that it doesn’t resist too much heat.

4. Silicone Roof Sealant

The main component of clear roof sealers, silicone is highly convenient because of its quick-drying properties and remarkably easy application.

Pros and Cons of Using Roof Sealant

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#1. It Increases Roof Life

Because it functions as an extra layer that covers a surface completely, roof sealant receives all the potential damage before the actual roof can. At the same time, it deflects ultraviolet rays, preventing damage to the materials. Logically, all this extends the lifetime of the roof by many years. Conveniently, one can reapply sealant whenever it wears down.

#2. It Reduces Roof Temperatures

By reflecting harmful ultraviolet and infrared sun rays away, roof sealant drastically reduces the temperature of the roof. This, in turn, reduces the temperature of the entire home, producing a most pleasant environment. In certain locations, it can reduce the indoor temperature of a home by up to 11 degrees. Of course, lower temperatures will produce great savings in energy used for air conditioning.

#3. It Reduces Moisture

By eliminating the possibility of water leaks, roof sealant greatly reduces moisture within the building. This is very important because moisture can damage the structural integrity of a home. At the same time, reducing moisture helps prevent the formation of mold and dampness.

#4. It Delays the Need of Roof Replacement or Repair

If a roof has minor damage, you will need to repair it. If the damage is major, you will probably need to replace it entirely. However, an opportune and strategic application of roof sealant can delay the need to do any of these things.


It can be expensive: Because it’s such a specialized material, roof sealant is by no means cheap. On average, homeowners spend between 302 and 1,153 dollars to seal their roof completely. However, in the long run, applying roof sealant to a home is a smart investment. Not only does sealant extend the life of the roof, but also helps reduce energy expenditure.

It can be difficult to apply to certain surfaces: In the cases of roofs with problems related to surface preparation and execution, roof sealant can often be non-effective. In order for roof sealant to adhere to it, a surface needs to be sufficiently smooth and regular. One should also take into account that different types of sealant may work better with certain types of surfaces. In order to determine this and other variables, we highly recommend you to opt for opportune testing procedures.

What to Expect from Roof Sealant

Although to inexperienced people it may seem like an unnecessary precaution, roof sealant is actually an effective solution to many roofing problems. Without a doubt, this material constitutes a huge aid for maintaining and restoring aging roofs. Whether they are caused by faulty installation, weather damage, sun damage or any other factors, roof defects can lead to many serious problems. Roof sealant corrects these defects by reinforcing the existing structure, filling it out and making it waterproof.

Even though sealant is not hard to apply, professionals tend to get much better results than regular homeowners. In some cases, you need to apply the sealant strategically in order to be truly effective. Additionally, you need to use the right type of sealant for each particular roofing surface. Another factor that affects the application of roof sealant is the angle of the roof. While most people use it on flat roofs, you can also use it on sloped roofs with the help of specialized tools and additaments. Whatever the particular case, we always recommend an expert’s assessment, which is always positive. However, non-professionals can rapidly learn how to properly do it, sometimes using user-friendly products like roof sealant spray.

Bottom Line

Conclusively, we can say with confidence that roof sealant is a beneficial addition to any roof. While there is the possibility that a roof is structurally sound enough not to need it, its extra benefits make it a beneficial addition anyway. In cases of damage such as puncturing and cracking, roof sealant can make the difference between having and leakage and not having it. You can use roof sealant to reform and correct certain structural defects. This is due to the fact that it is a versatile material. Without a doubt, all of these beneficial features make roof sealant a very important construction material.

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