Metal roofs are a great choice for durability and longevity. They are designed to last for several decades, but over time, some roofing seams will need to be sealed to prevent leakage and prolong the roof’s lifetime. So, how to seal metal roof seams?
Sealing metal roof seams is a fairly straightforward process. To seal metal roof seams, professionals use a special sealant, such as butyl rubber or silicone, to block any leaks. Homeowners can also seal metal roof seams using the same methods.
Here, we’ll take a look at the different types of metal roof sealing methods. We’ll also discuss the tools and materials needed for the job.
Importance of Sealing Your Metal Roof Seams
Sealing metal roof seams is important for a number of reasons. First and foremost, it protects the roof against moisture penetration. As you may know, moisture is the number-one enemy of a metal roof—if left unchecked, it can cause rust and lead to costly repairs.
A well-sealed roof will also improve the efficiency of the roof, as well as its lifespan.
As I mentioned above, a properly sealed roof will prevent moisture from entering the building envelope and protect the roof from rusting.
Additionally, a well-sealed roof will improve its efficiency by acting as an insulator. Well-sealed seams also extend the lifespan of the roof—a well-sealed roof is better able to withstand extreme weather conditions, prolonging its life.
Supplies You Need for Sealing Metal Roof Seams
- 6-inch butyl tape for horizontal sealing
- 3-inch butyl takes for vertical sealing
- Calking gun
- Seam roller or brush
- Quality caulk solution
- Push broom, spray paint machine, topcoat sealant
How to Seal Metal Roof Seams by Caulk
- Begin by cleansing the metal roof of any and all dirt or debris.
- Lay a strip of butyl tape (6 inches or more) over the lapping edges of seams in the horizontal direction. While sealing, remove the backing and apply at a 45-degree angle slowly. Press down carefully while releasing pressure to secure seal. Repeat process if you notice any wrinkles or bubbles in sealed seam area.
- 3-inch butyl tape needs to be applied vertically on the entire metal seam. The steps used while doing it are the same as in a horizontal movement. Place the tape slowly and press it carefully over the metal panel seam. If you find any wrinkles or bubbles, then roll out for more reliable sealing. Just overlap the butyl tape vertically on already sealed horizontal ends need to be overlapped.
- Now the time is to apply water-proof metal roof caulk to both edges with a caulking gun. Let the caulk dry entirely for more secure sealing.
- In the end, apply a top coat of the caulk to the entire metal roof with a brush or paint roller for refined and finished sealing.
How to Seal Metal Roof Seams with Silicone
Prepare the Area
Use a solvent—such as mineral spirits or paint thinner—to remove any dirt or grease from the seam area. Then, wipe the area with a paper towel or cloth to remove any excess solvent.
Apply the Silicone
Using a silicone caulking gun, apply a bead of silicone along the seam. Then, use a rubber spreader or putty knife to smooth out the silicone and push it into the seam.
Let Cure for 24 Hours
After applying the silicone, allow it to cure for at least 24 hours before using the roof.
Reapply as Needed
Depending on the type of silicone used, it may need to be reapplied every few years. Contact a local roofing contractor for more information about silicone options and application. We have already discussed how long does silicone caulk last in a separate article.
Performing regular maintenance on your metal roof—including cleaning and resealing any damaged areas—can help extend its lifespan.
Useful Tips for Sealing Metal Roofs
You can use the spray paint machine for easy applying of topcoat sealant on metal sheets evenly. But metal roof needs to be properly clean and dry before application of butty tape, caulk solution, and topcoat sealant.
Let’s check out what the professionals practice –
Research Different Sealants
There are a variety of different sealants available on the market—each with their own unique properties and applications. When choosing a sealant for your metal roof, it’s important to research the options and choose a product that is best suited for your specific needs and roofing material.
Prepare the Roof Surface
Before applying a sealant to your metal roof, it’s important to ensure that the surface is properly prepared. Any existing coatings or paint should be removed to ensure proper adhesion and compatibility with the sealant being applied.
Any holes or cracks should also be repaired to prevent moisture penetration and potential damage to the roofing material.
Apply the Sealant
Once the surface is properly prepared and any necessary repairs are made, it’s time to apply the sealant. Follow the instructions provided by the manufacturer to ensure proper application and coverage of the sealant.
It’s also important to carefully monitor the sealant throughout the application process and immediately address any issues such as pooling or drips.
Sealing metal roof seams is a crucial part of roof maintenance. It will prevent leaks, extend the life of the roof, and ensure the roof is waterproof.
The process is fairly straightforward, but it is important to make sure that you use the right sealant to prevent leaks. If you found this article helpful, share it with others and leave a comment. Thanks for reading!