Cement Crown On Chimney

The crown should be at least 4 thick and have a slight outward slope to shed water away from the chimney flue.

Cement crown on chimney.

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. Diy chimney crown repair. If the flue is at a height less than 6 inches the crown should be built 2 inches from the flue top. Chip off old mortar from the existing chimney crown but using a hammer chisel and wire brush.

How to construct a chimney crown bia guidelines. Construction of cast in place concrete chimney crown a cast in place chimney is constructed by using forms made of either wood or steel. Form members are assembled and aligned with respect to the required crown dimensions. Buy the right form.

A solid crown in good repair prevents water damage from. During construction the flue should be wrapped with a compression material to allow a 1 4 separation between the concrete crown and the flue tile. Build your cap frame use 2x4 lumber to make your new concrete form. A cap covers the flue or pipe opening.

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 crown prevents water from seeping into the masonry walls. The purpose is to act as a barrier for moisture between the outside and the masonry chimney. It is the most popular and long lasting chimney crown assuming that it s been properly installed brick chimney covered with mortar.

See if the cement holds to the chimney body and then apply more of the mix. Used often but extremely poor in performance stone which outperforms all. A chimney crown is a solid masonry surface that covers the top of the chimney walls. Spread evenly using the trowel.

This is not the same as the chimney cap. The concrete crown should not come into contact with the flue. There are 3 basic types of materials used to create a brick chimney crown. The brick institute of america bia which receives numerous complaints about disintegrating brick.