Pouring Concrete Chimney Cap

A chimney cap sometimes referred to as a crown is a reinforced concrete cap placed over the top of a brick and mortar chimney. My solution was to pour the cap in place and then remove the formwork with the help of my car jack. Mix the concrete you will pour into the form using small aggregate.

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Contents bia recommendations construction of concrete chimney crown1.

Pouring concrete chimney cap.

I ran into a chimney sweep who explained that the reason so many caps crack is that since the mason is up there finishing the top of the chimney and he s got a batch of mortar and he s all set up to mix mortar he creates the cap out of mortar which doesn t last as well when exposed horizontally as it does when exposed vertically. The mortar mix rarely has any stones in it. This article series illustrates common chimney cap crown types choices defects and we cite pertinent chimney top cap crown building codes standards for fire and other safety concerns. Otherwise the concrete will not bond to the brick surfaces.

I decided to pour a concrete cap for the chimney knowing that the primary challenge lay in getting the thing to the top of our 2 1 2 story house. The stones in concrete are what really give it its strength. The chimney crown should be made using real concrete not the mortar mix used for the brick or stone. This article describes the construction of the concrete crown or weather cap found at the top of masonry chimneys and flues.

Chimney weather cap or chimney crown construction suggestions. Then fill the form with concrete. Construction procedure of chimney crowns made of concrete is discussed below. 3 rebar leaving it 2 inches in from the edges of the form.

If the chimney has clay flue liners the crown or top concrete material should never touch the flue liners. This sweep said that when he does a replacement he. The cap is designed to protect and shed rain water away from the. Dampen the chimney brick with water and pour 1 inch of concrete into the form.

Chimney crown also termed as chimney cap or chimney top plate is a cover provided on the top of chimney chase to prevent the entrance of rainwater into the chimney. Construction of cast in place concrete chimney crown2.