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Common Mistakes to Avoid When Repointing Bricks

Repointing bricks is an essential task to maintain the structural integrity and appearance of your brickwork. Over time, mortar joints can deteriorate due to weather exposure, with studies showing that typical mortar joints have an average lifespan of 20–30 years. It depends on environmental conditions. 

Common causes include freeze-thaw cycles, excess moisture, and improper maintenance, all of which can lead to weakened walls and structural damage (Source: National Masonry Institute). Sounds easy enough, right? Well, not quite! Many people make common mistakes that can result in costly repairs. Let’s chat about what you should avoid to make this project a success.

Using the Wrong Mortar Mix

Here’s a question for you: Do you know what type of mortar your bricks need? Using the wrong mix is a classic mistake. The mortar you choose needs to match the original in composition, color, and strength. If it’s too hard or doesn’t gel well with the bricks, you’re looking at cracks and damage down the line. According to the Brick Industry Association (BIA), mortar strength must closely match the type of brick to prevent structural issues. Using mortar that’s too strong can lead to damage in softer, older bricks, while weaker mortar can cause poor adhesion and gaps over time. Not fun!

Tip: Do a little detective work. Research the type of mortar originally used or ask a professional for advice. For older homes, lime-based mortar is usually the MVP. Using mismatched mortar can lead to poor adhesion and damage over time.

Neglecting to Prepare the Joints Properly

Imagine trying to stick a bandage on dirty skin. Not ideal, right? The same goes for mortar. Failing to clean out old, crumbling mortar properly means the new stuff won’t bond well. In fact, a survey by the National Masonry Institute found that 67% of repointing failures were linked to inadequate cleaning of joints. This oversight often leaves behind loose debris, compromising the structural bond and leading to early mortar deterioration.

Tip: Grab a chisel or joint raker to remove all the deteriorated mortar. A stiff masonry brush or even compressed air works wonders for cleaning out the debris. Trust me, this prep step is worth it! Proper preparation ensures a strong bond and prevents future issues like moisture penetration.

Overfilling or Underfilling the Joints

Have you ever seen mortar joints that look like they’re popping out or sinking in? That’s what happens when you overfill or underfill. Neither looks good, and both can weaken the wall.

Tip: Aim for the Goldilocks zone; not too much, not too little. Smooth it out using a jointing tool for a neat finish that maintains the aesthetic appeal of your brickwork.

Ignoring Weather Conditions

Ever tried painting in the rain? Repointing bricks in the wrong weather is just as bad. Extreme heat, below-freezing temperatures, or excessive moisture in the environment can disrupt the mortar’s setting process. For instance, mortar sets best in temperatures between 50°F and 80°F. According to the National Association of Home Builders (NAHB), working in temperatures outside this range can lead to rapid drying in hot weather or delayed curing in cold conditions, increasing the risk of weak joints and structural issues.

Tip: Pick a day with mild, dry weather. If rain is in the forecast, use plastic sheets or tarps to protect your work. Harsh weather conditions can cause premature drying or improper curing, so plan accordingly.

Rushing the Process

Let’s face it; we’ve all been guilty of rushing a project to check it off the list. But repointing bricks isn’t the time to cut corners. Speeding through can lead to uneven mortar or weak joints.

Tip: Slow and steady wins the race. Take your time to apply and smooth the mortar properly. Curing of mortar takes sufficient time, so be patient for long-lasting results.

Using Power Tools Incorrectly

Power tools can be a lifesaver… or a disaster if used the wrong way. Overusing a grinder can chip or damage the bricks, and that’s not a look anyone wants.

Tip: Use power tools sparingly, and always test on a small section first. For historic masonry or delicate brick structures, stick to high-quality hand tools to avoid potential damages.

Not Sealing or Protecting the Area After Repointing

Think of sealing as putting the icing on a cake. Skipping this step leaves your brickwork vulnerable to moisture and weather damage.

Tip: Apply a breathable masonry water-repellent solution to protect the bricks. Avoid non-breathable coatings that can trap moisture and cause more harm than good. This extra layer acts as a defense against moisture infiltration.

Skipping Professional Help When Needed

Here’s a tough truth: Sometimes, it’s okay to admit a job is too big to tackle alone. If the damage is severe or your brickwork has historic value, it’s worth calling in the pros.

Tip: Know when to say, “I need help.” Professionals have the expertise and proper training to ensure the job is done right the first time, preserving the integrity of your brickwork.

Conclusion

Repointing bricks is a satisfying project, but it’s not without its challenges. Avoid these common mistakes, and you’ll save yourself a lot of headaches (and money). Proper repointing involves using the correct techniques, essential tools, and the right mortar mix. Regular maintenance and attention to detail are crucial steps for long-term preservation.

What’s your next repointing project? If you’re feeling unsure or stressed, reach out to us. We’d love to lend a hand and make sure your walls are as good as new!

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