Cement Crown On Chimney

The crown prevents water from seeping into the masonry walls.

Cement crown on chimney.

How to construct a chimney crown bia guidelines. A chimney crown is a solid masonry surface that covers the top of the chimney walls. Used often but extremely poor in performance stone which outperforms all. To avoid bonding problems between old brick and new concrete be sure to clean off all dust and debris from the old brick.

The brick institute of america bia which receives numerous complaints about disintegrating brick. Chip off old mortar from the existing chimney crown but using a hammer chisel and wire brush. A chimney crown is a concrete cap that tops the masonry walls of a brick chimney to shed water and seal the chimney s flue to the masonry. Form members are assembled and aligned with respect to the required crown dimensions.

I show you all the steps i used chipping out the old crown cutting plywood if you are worried about moisture use 1 2 hardie bac. A cap covers the flue or pipe opening. This is not the same as the chimney cap. Buy the right form.

The concrete crown should not come into contact with the flue. The crown should be at least 4 thick and have a slight outward slope to shed water away from the chimney flue. There are 3 basic types of materials used to create a brick chimney crown. If the flue is at a height less than 6 inches the crown should be built 2 inches from the flue top.

Build your cap frame use 2x4 lumber to make your new concrete form. Spread evenly using the trowel. Diy chimney crown repair. A solid crown in good repair prevents water damage from.

It is the most popular and long lasting chimney crown assuming that it s been properly installed brick chimney covered with mortar. If the flue of the chimney is about 6 inches from the top the crown must be made 4 inches from the flue top. The purpose is to act as a barrier for moisture between the outside and the masonry chimney. See if the cement holds to the chimney body and then apply more of the mix.