Depending on the type of weather cap and or damper bought follow the manufacturer s instructions.
What type of mortar for chimney cap.
The nps describes type n mortar as a mixture of 1 part cement 1 part lime and 5 to 6 parts sand.
National parks service also recommends type n mortar for the majority of chimney applications.
It is also the preferred mortar mix for soft stone masonry.
For very severe weather applications consider a type s mortar mix made from 1 part cement 1 2 part lime and 4 to 4 1 2 parts sand.
Install cap and screen at top of chimney.
Step 1 prepare the chimney.
If any mortar comes loose from the brick cap underneath the wash make sure that you repoint with fresh mortar.
Unfortunately after looking at hundreds of brick chimney on new.
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.
You should sweep off as much of the excess mortar as you can using a hard bristled brush.
For the chimney crown to fulfill its purpose it must be properly shaped and installed.
The basic mortar ingredients remain the same.
How to repair chimney mortar.
This sweep said that when he does a replacement he.
The chimney cap also called a rain cover is a stainless steel metal cage like box with a roof like top which fits directly on top of the chimney flue liner.
Type n mortar mix has a medium compressive strength and it is composed of 1 part portland cement 1 part lime and 6 parts sand.
Portland cement to bond water to turn it into a paste sand and hydrated lime.
The first tip to remember when mixing chimney mortar is the four different types of mortar that are commonly used in building projects.
Remove any mortar which is loose or has been previously used for a different chimney cap.
It is considered to be a general purpose mix useful for above grade exterior and interior load bearing installations.
The first step is to ensure that the chimney is got ready for the cement cap.
The chimney cap will also keep birds and other animals out of your.
Install a cap and screen.
For smaller jobs pre mix mortar is available that is used right from the container.
To complete the project and to prevent rain water from entering the flue install a cap and screen at the top of the chimney.
The most common type is called masons mortar which is used for building chimneys and repairing them.
Because the top of the chimney takes a beating from the elements over the years i recommend using type s masonry cement mortar which has an increased amount of portland cement.
The different types of mortar.
