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   Articles | How-Tos | Ask the Expert   

Filling Cracks Around the Chimney Seal

Old houses often develop cracks between the chimney and the roof.  In this article, the cracks between the chimney and a metal roof are sealed using roof cement.  This is a perpetual maintenance issue and should be checked every few years. 

Items needed:
Roof cement (preferably
in a tube, not can)
Trowel or spatula
Extension ladder

Safety Suggestions and Tips
Place board beneath caulk tub or can
Use caution on ladder
Keep a clean up rag handy
Use a 5-gallon bucket to
hoist materials up to roof

Level of difficulty

Time Required:
3 hour


Tube of roofing cement

Step 1:

The first step is to access the roof using an extension ladder, preferably on a warm day. If you are using roof cement, I recommend using the tube package which fits your caulking gun. 

Can of roofing cement

Step 2:

The gun only requires one hand, whereas the roof cement in a can requires two hand, to hold the cement and a trowel.  The cement in a can may be less expensive, but we would recommend against this, especially on a tin roof like this one.

Carefully inspect for cracks

Step 3:

First examine the area between the brick and the roofing, looking for small cracks.

Expansion cracks

Step 4:

These are caused in part by deterioration of the old cement and the different thermal expansion properties of the chimney and the roof.

Fill all cracks

Step 5:

Using the caulking gun, force ample amounts roof cement into the cracks.

Squeeze cement into cracks

Step 6:

Apply a liberal amount in all areas.

Smooth with spatula or trowel

Step 7:

On the vertical areas it may be necessary to smooth the excess cement using a trowel.  

Fill vent stack cracks

Step 8:

After the chimney is sealed, look to the plumbing vents

Fill between brocks and chimney stack cover

Step 9:

Don't overlook the stack of the flue.


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