Home Improvement

What you need to know about roof sealants


No doubt, it’s crucial to preserve the service life of your roof considering that it’s an important part of your building. One of the ways you can do this is to make sure that you use proper lap sealant. You need to use lap sealant to seal splice edges or around the edges of flashing. Remember that lap sealant is also an important part of flashing details Get the best services from Suffolk County Roofers

For the lap sealant to have long-term performance, you need to utilize the pre-formed plastic lap seal feathering device that comes in every packaging of the sealant. In most cases, the lap seal feathering tool has a v-shaped groove designed to provide a rounded mound on the center of the lap sealant over the flashing edge. 

Understanding EPDM sealant

Perhaps, the most effective waterproofing products when it comes to the metal roofing industry are the EPDM and butyl sealants. These two products have been used successfully for decades. You should note that mounting accessories can involve penetrating through your roof, so you need these sealants to prevent roof leaks. This can be of help in the short and long term.

The good thing is that you can prevent leakage and water intrusion in your home. You need to seal the holes in your roof. Remember that applying external caulking and sealants can eventually dry out and crack, so this can lead to leakage and corrosion.

And, factory-applied sealants can offer you top performance. This means that you should look out for fasteners with factory-applied EPDM sealants so that you can have dependable weatherproofing. When you do this, you can have to weatherproof that without unstable and messy in-field applications. Also, factory-applied sealants can also remove the risk and cost of choosing less effective products out there. 

There is a good chance that you may be wondering what EPDM is all about. Well, EPDM stands for ethylene propylene diene monomer. This is a semi-hard and smooth synthetic rubber. You need to use EPDM because it has high-tensile strength. Besides, EPDM is reliable, flexible, and durable. This material is suitable in cold and hot climates and is moisture resistant. Take note that EPDM is waterproof, and some people use it as pond liners. This material has been a preferred roofing material for decades and is commonly used in the commercial roofing industry.

Just like any other product, specific formulations of EPDM sealant can differ from other types of sealants. In most cases, the individual formulations tend to be proprietary, meaning they are secret. This also means that different types of sealants cannot perform the same. Therefore, you should always purchase the sealant from a supplier who has a history of success and is reputable on the market.

Aside from choosing a supplier with known integrity, you can extend the life of EPDM in various ways to make sure that they perform well over time.

If you decide to use EPDM sealant, you should avoid using it as a surface-applied fix on your roof. This is because sealant has complicated chemistry. If a sealant is not properly protected, various factors tend to break down its chemical bonds. 

And, surface applications are usually subject to degradation from ozone, UV, dirt, mechanical abrasion, and other contaminants. You can use it as gasket material to help protect a sealant from these threats. Even when you apply it as a gasket material, a good sealant usually has other vulnerabilities. Therefore, it’s a good idea to look for attachments so that you can conceal the sealant from exposure and you should also protect its edges. 

You should also avoid over-compressing the application. When you place the screw, you can seal it but don’t over-tighten it. Otherwise, you can thin and even displace the gasket material. As a result, you can reduce its lifespan and effectiveness. In such cases, you need to use a part design that has a built-in-like reservoir so that you can encapsulate the material and assist to prevent over-compression.

You should remember that there are many places where you can use EPDM sealant. Geographical locations can sometimes affect mounting options. For example, attaching to the panel’s flat surface, which is the low valley of the corrugation or flat part between trapezoids, tends to be common in some areas. This is because it has been proven that a sealant works well when it comes to waterproofing. 

But installers in some areas prefer the penetration method, meaning they do it away from the drainage part into the rib. These two methods are also called the top-fix and bottom-fix. Since EPDM is usually semi-hard just like the gasket material, it has to attach to a flat area so that it can create a watertight connection. And, the smoothness of the roof profile is often a good match for EPDM. 

As explained earlier, butyl sealant is another sealant available on the market. This sealant allows it to march the irregular surfaces, such as minor striations and ribs in the panel valley. If you decide to use butyl tape, then the sticky sealant can retain its shape to have a mess-free application. And, if you choose to mount in the low, you should use only the products that can attach through the roof sheet to get into the deck or structure. This ensures that there is stability, roof protection, and weather tightness. 

Above all, when lap sealant is flattened into a thin layer, it can be more prone to cracking because of the natural expansion and expansion that happens on your roof. This is the reason why you should use the plastic feathering tool so that it should not deform when there is extra pressure. Remember that by doing this; you can still have a rounded mound of sealant. 

To make sure that there is a proper application, all surfaces that require sealing need to be dry and free of dust, oil, and other foreign materials. You should also clean the surface that needs sealing to remove all foreign materials. Then you can apply lap sealant on the outside edge of the flashing. Lastly, you need to use a plastic feathering tool to create a rounded mound.