Everything You Need to Know About Repointing Brick and How to Do It

How to Repoint Brick

Before you repoint brick, make sure that the outside temperature is and will remain at the mortar's specified temperature range for another two to three days. This range is typically between 40°F and 100°F, but be sure to check with the instructions on the bag.

1. Protect Surfaces

   Cover the ground in front of the brick with a drop cloth.

2. Determine Mortar Depth

   Measure the width of the vertical brick joints. You'll need to remove mortar as deep as twice the width of the vertical brick joints.

   Brick Joint Width	Mortar Removal Depth
   1/4-inch	1/2-inch
   3/8-inch	3/4-inch
   1/2-inch	1-inch

3. Adjust the Raking Tool

   Set the pin on the wheeled skate-style raking tool to the desired mortar removal depth. 

4. Rake the Vertical Joints

   Rake the vertical joints first, starting at the top and working downward. Occasionally, brush out the joints with the masonry brush so you can see the brick.

5. Rake the Horizontal Joints

   Rake the brick's horizontal joints, starting at the top and working down. Frequently sweep out the joints with the masonry brush.

6. Brush the Joints

   Brush any joints that have remaining mortar with the wire brush. It's not necessary to brush all of the joints—only joints that still have stray pieces of mortar.

7. Clean the Brick Joints

   Clean the brick joints thoroughly with the masonry brush.

8. Mix the Brick Mortar

   Mix the mortar with water in the five-gallon bucket to a smooth, workable consistency similar to peanut butter.

   Tip

   Use the right type of mortar. Type O mortar isn't used as a structural mortar for load-bearing walls, but it is ideal for repointing. It is sometimes called "pointing mortar."

9. Add Mortar to the Joints

   First, fill the long, continuous horizontal brick joints. Place a fist-sized amount of mortar on the hawk. Spread out the mortar on the hawk. Hold the hawk so that it is just below the horizontal joint and touching the brick below the joint. With the pointing trowel, slide the mortar into the joint and tamp it into place. Follow by filling in the shorter vertical joints.

   Tip

   The front of the mortar should stand out from the brick face. The mortar should not be flush with or recessed from the brick face.

10. Let the Mortar Rest

    Leave the mortar for about 30 to 45 minutes to partially dry. Test by pressing the mortar with your finger. If your finger does not leave a depression, the mortar is ready for repointing. Do not let the mortar completely dry out.

11. Strike the Joints

    Strike the brick joints by running the edge of the margin trowel across the brick to remove extruded mortar.

12. Repoint the Vertical Joints

    Starting with the vertical perpendicular sections, press the pointing trowel into the mortar. Slide the trowel to smooth and compress the mortar. Do this for all vertical joints.

13. Repoint the Horizontal Joints

    Repoint the horizontal mortar courses similar to the vertical joints. Slide the pointing trowel along the mortared joints, compacting and shaping the mortar.

14. Brush Away Excess Mortar

    With the masonry, brush away excess mortar from the face of the brick. Go easy to avoid digging into the newly repointed mortar between the bricks.

Cost of Repointing Brick

The cost of repointing brick ranges from $4 to $17 per square foot when a mason does the project. The cost to repoint brick on a 100-square-foot area starts at $400 and ranges up to $1,700.

The cost of repointing brick by yourself is about $0.50 per square feet. The cost to DIY repoint brick on a 100-square-foot area is around $50 to $75.

Type O mortar costs about $10 per 80 pounds, a quantity capable of repointing 35 to 40 square feet of brick, with 3/8-inch-width joints filled to a depth of 3/4-inch.

When to Call a Professional

Repointing brick isn't complicated, but it is labor-intensive. Masons have the tools and expertise needed to repoint large areas of brick. They also have scaffolding and fall-arrest gear for working on high areas like chimneys.

Tips for Repointing Brick

• Note that if you only repoint a portion of a wall, the new mortar will likely not match the existing mortar.
• Work in small sections to avoid mortar drying prematurely.
• Mist the brick with the garden hose to hold down dust.
• Be careful not to chip or gouge the brick.
• Reset the raking pin frequently to maintain raking depth.