DIY Network

Case of the Smoking Window: Chimney Repair Tim Hockenberry inspects and repairs a leaky chimney. From "Finders Fixers" episode DFFX-104

Tim Hockenberry found numerous problems with homeowner Joel Ranck’s fireplace and chimney beyond the hole that allowed smoke to waft into the house from a nearby window. From the roof, Tim and specialty contractor Ki Giuliano demonstrate how to repair a masonry chimney crown to prevent water from leaking into the flue and house. They also explain how to point up aging and deteriorating brick on the exterior chimney.

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Materials:

mortar
trowel

1. If you haven’t done so already, mix the mortar; it should be the consistency of cookie dough, not too dry and not soggy (figure A).

Note: Refer to the resources listed below for tips on mixing mortar.

2. While the mortar rests, prep the area by clearing away any loose debris.

3. When applying the mortar to the crown, form the mortar into an apex with the peak at the middle of the crown sloping down toward the edges. Think of it like a roof: the idea is to have the water drain away from the crown (figure B).

Note: Don’t make the edge too thin; keep the edge at an approximately 1/2"-3/4" height to prevent it from possibly detaching later. Also, use the mortar to also seal up any holes around the crown (figure C).

Figure A

Figure B

Figure C

Tuck Pointing Brick

1. To begin restoring the brick mortar joints, a process commonly known as tuck pointing, first prep the area to ensure good mortar adhesion (figure D).

2. Apply the mortar to the joint using a pointing trowel, if one is available. Fingers often work as the best tool for some of the tighter joints (figure E); just make sure the mortar is tightly packed each time it's applied.

Figure D

Figure E

3. Clear away excess mortar (figure F), making sure it fills the void and stays in place.

Note: As you’re working, keep the mortar churned and at the right consistency.

4. Let the mortar to cure for several hours before doing any further work on the crown.

5. To complete the project, and to prevent rain water from entering the flue, install a cap and screen. Depending on the type of weather cap and/or damper you get, follow the manufacturer’s instructions (figure G).

Figure F

Figure G

RESOURCES :

Quikrete
Website: www.quickrete.com