Can you insulate around boiler flue?

One cheap and easy way to finish around the flue is to not touch the flue itself, but to leave a space of 30cm or more from the flue to the insulation. This creates a recess, as shown in the photo, which is a big enough gap to ensure the flue can operate safely, whilst still insulating the vast majority of the wall.

Can you insulate flue pipe?

By insulating the flue pipe you can contain the heat inside it. This helps to keep your attic cooler. Insulating flue pipe is mainly done to contain the heat inside the pipe. But that’s not the only reason to use it.

Do you need to seal flue pipe?

The pipe connected to a wood or pellet stove should not need sealing unless it has a hole or leak in it. When conditions are right, the negative pressure and natural draw of the stovepipe causes the hot smoky air to rise through the pipe and out the chimney.

How do you insulate around a flue pipe?

Seal the gap between the flue and metal flashing with special high-temperature caulk. Don’t use spray foam. Form an insulation dam to prevent insulation from contacting the flue pipe. Cut enough aluminum from the coil to wrap around the flue plus 6 inches.

Can I use expanding foam around a boiler flue?

When drilling the hole, it should be remembered that the flue has an inbuilt 3º fall back to the boiler. It should be ensured in all installations that the wall is sealed to the flue inside the property by using expandable foam, by pointing with sand and cement or using any other suitable material.

What can you use to seal a boiler flue?

Sealing around a boiler flue traditionally requires pointing with sand and cement. Removing any need for pointing, FlueSnug can be installed in less than five seconds and snuggly fits the 152mm core-drilled hole in the wall through which the boiler pipe and flue exits.

What do you use to seal a flue pipe?

There are few options that will allow you to easily seal off your flue: a silicone rubber seal or inflatable sealer. Both are efficient at sealing off the flue, even more so than traditional dampers, and are relatively inexpensive. Sealers can be found at chimney supply stores, masonry stores, or online.

https://www.youtube.com/watch?v=aBZgMpsoxME