Scrape out cracked grout from between the bricks of your chimney to the depths of the cracks using a grout rake. This inexpensive tool, which rolls along the surface of old grout and tears it up with a nail-like blade, may be found at any hardware store. A hammer and chisel can be used as well, though make sure you do not chip away grout beneath the depth of the cracks. Wear gloves to protect your hands and goggles to protect your eyes from flying chips.
Scrub the surface of the remaining grout with a wire brush to remove all loose chips and dust.
Dampen the bricks with a spray bottle of water, then use a pointing trowel--a small trowel with a narrowly-pointed tip--to spread weather-resistant ready-mixed grout into the gaps between the bricks. Pack as much grout as possible into the space.
Let it dry for half an hour, then scrape off any excess grout with a trowel and brush the entire surface with a stiff brush to clean up the appearance of the chimney.
Things You Will Need
- Grout rake
- Wire brush
- Spray bottle
- Ready-mixed grout
- Pointing trowel
- Stiff brush
- Keep your work area clean as you go along. Vacuum or sweep up grout dust and chips of old grout to prevent them from intermingling with the fresh wet grout. Close dampers while working on a chimney to prevent dislodged soot from falling down into the fireplace.