Case Study: Chimney Cap as per Building Code
Before and After
Chimney cap replacement
Remove the old metal cap,
Create a new, peaked and sloped, concrete cap.
Re-install Storm Collar on Vent.
The Underlying Problem:
The metal chimney cap sagged in the middle.
Let water in. There was no internal support.
You can see the discolouration where water pooled.
The metal cap had another metal cap underneath, both sagged.
The Chimney Cap Removed.
Here, neatly removed with the storm collar, is the cap now on the roof.
Another Cap Underneath
This cap will be left in place to serve as a bond-break,
so the new concrete cap does not adhere to the bricks.
A bond-break helps the cap and bricks last longer,
as they have different rates of expansion and contraction.
This metal layer is now required in the Building Code.
A Form for the Concrete
You can see the wood form that will hold the concrete.
Red tape around the edge protects the rope forming the drip edge.
Concrete is now being added, like the water, it too sags.