Six Tips To Prevent Leaky Stove Pipes On Metal Roofs

If you're sitting inside on a cold winter's day, the last thing you want to see is water dropping in around the pipe of your wood burning stove. Luckily, you can easily prevent this issue from happening with the right installation tips, and if you are experiencing leaks on a stove pipe that has already been installed, there are several things you can do to remedy the situation.

1. Cut the hole tightly.

When putting a stovepipe through a metal roof, you want to cut the hole in the roof as tightly as possible. Place a piece of paper over the top of the stove pipe, trace the circle, and use this as a guide when you create the hole in your roof. You may want to cut the roof hole slightly smaller than the traced circle so that when you push the stovepipe through, it is as flush with the roof as possible.

2. Consider a through-the-roof kit.

Through-the-roof kits provide all the elements you need to safely put your stove pipe through your roof. For example, these kits often contain a heat resistant shell that you put around the part of the stove pipe that runs through your rafters. They also help to create a professional finish, which can help to prevent leaks in the future.

3. Use a double-walled stovepipe.

If possible, use a double-walled stove pipe. This design keeps most of the heat in the inner wall of the stovepipe. As a result, the outer wall stays cooler, and this makes it less likely to melt any sealant you use around the edges of the stovepipe.

4. Apply a high-heat silicone.

Ideally, you should apply a bead of high-heat silicone around the perimeter of your stovepipe where it touches your metal roof. This creates a waterproof barrier that can prevent water from seeping in around the stovepipe. Additionally, if you have any water leaks after the stovepipe is installed, you should apply new silicone to help reseal the area.

5. Install custom flashing.

Instead of just using sealant, you may want to install metal flashing around the stovepipe as well. You can buy roof flashing designed for use around stove pipes, or you can have it custom made. It features a flat metal part that sits on your roof and an extended cylindrical part that slips over your stove pipe. You can hold it in place with roof screws and silicone sealant, or welding can also work.

6. Check out silicone rubber boots.

An effective way to prevent leaks is with a silicone rubber boot. When you buy this "boot" it looks like a large rubber cone with measurements on it. You cut down the boot based on the circumference of your boot. Then, you slip the boot over your stovepipe. When the boot reaches the roof, it creates a nice seal between the roof and the stovepipe, and it covers up the gap between these two parts. Most boots also feature a thin metal band which you can hammer into place to help the rubber boot form to your roof.

Additionally, because the boot is silicone, it can get into the nooks and crannies of a corrugated roof — that can be convenient if you don't have a flat metal roof. To attach the boot, you can use neoprene washers and fasteners. Note that you don't necessarily have to install a boot right away. If your existing stove pipe is leaking, you may want to talk with a metal roofing professional about removing the existing flashing and replacing it with a silicone boot.

If you have other questions about dripping stove pipes or any other aspect of your metal roof or its accessories, contact a metal roofing professional, such as those at Acoma Roofing, Inc., today.   

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