Things You'll Need:
- Crown Repair And Sealing Material
- Jointing Tool
- Brick Trowel
- Mortar Mix
- Soft Brush
- Cement-mixing Container And Hoe
- Grinder With Tuck-pointing Attachment And Blades
- High-temperature Caulk And Caulking Gun
- Ladders Or Scaffolding
- Mason's Hammer And Chisel
- Pointing Trowel
- Scraper
- Square Mason's Trowel Or Board
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Step 1
Work from the bottom up to remove loose mortar a few feet (a meter or so) at a time. Set up ladders or scaffolding if necessary. Use a mason's hammer and chisel, a scraper and similar hand tools for difficult-to-reach areas. For extensive tuck-pointing, rent an electric grinder with a tuck-pointing attachment and blades.
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Step 2
Mix water into a packaged mortar mix as directed on the label, using a cement-mixing container and hoe.
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Step 3
Apply the mortar by first loading the bottom side of a square mason's trowel (or a board) with mortar (see A). Then, holding the trowel against the chimney just below the joint you're filling, slice off a portion of the mortar with a pointing trowel and pack it into the joint.
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Step 4
When the joints in an area are all full, strike off the excess by slicing through the mortar with a brick trowel held flat against the bricks.
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Step 5
Compress, shape and smooth the joint. Run a jointing tool across the joints for concave and V joints (see B). Or use the tip of a pointing trowel to create a 30-degree bevel from the underside of the upper course to the edge of the lower course. Knock off any excess and move up to the next section.
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Step 6
When the joints have set up, clean the face of the brick with a soft brush.
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Step 1
If a traditional crown made of portland cement and sand is badly eroded or cracked, replace it with a modern (crown-sealer) system. These coatings, which you can apply with a trowel (following the manufacturer's instructions), remain flexible and provide a far superior water seal. If the crown has some cracks and is beginning to show wear, or even if a masonry crown is in good condition, consider using this material as part of an overall chimney repair.
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Step 2
Seal joints between the clay flue's liner and the crown with high-temperature caulk.








Comments
flashover said
on 5/11/2008 I have a severely deteriorated chimney crown. I need to know how to recover the open void area between the chimney liner and the brick
Mehdi said
on 2/12/2007 very helpful thanks