Repointing Stone Walls: Why It Matters and How It’s Done

When was the last time you really looked at your stone wall? If it’s starting to crumble, crack, or just look a bit tired, chances are it’s crying out for some TLC — and that’s where repointing comes in.

You don’t need to be a stonemason to understand the value of preserving your stone walls. Whether it’s a garden wall passed down through generations or a feature on your home, giving it a little attention now can save you a lot of hassle (and money!) down the line. Think of it like visiting the dentist — ignore it too long, and things will fall apart!

Let’s dive into the world of repointing stone walls, guided by insight from experienced Collingtree Stonemasons of Northampton.

1. What is Repointing?

Repointing is the process of renewing the mortar joints between the stones in a wall. Over time, wind, rain, frost, and even the occasional football kicked against the wall can wear the mortar away. Without proper care, the stones may become loose, unstable, and eventually collapse.

2. Why Do Stone Walls Need Repointing?

Imagine your wall like a sponge cake held together with icing. If the icing dries out and crumbles, the cake layers start to fall apart. Mortar is the “icing” of your stone wall — and repointing is simply replacing that old, crumbling filler with fresh, strong material.

Stone walls need repointing to:

  • Prevent water ingress

  • Maintain structural strength

  • Improve appearance

  • Preserve historic value

3. Signs Your Stone Wall Needs Repointing

Not sure if your wall needs repointing? Look for these tell-tale signs:

  • Cracked or missing mortar

  • Loose stones

  • Damp patches inside the home (for structural walls)

  • Plants growing in joints

  • White staining (efflorescence)

If you see any of these, it’s time to call in the pros — like your friendly neighbourhood Collingtree Stonemasons of Northampton.

4. Benefits of Repointing

Here’s why repointing is well worth the investment:

  • Prevents major damage: Stops water seeping into the wall, which can freeze and expand.

  • Saves money: Catching the problem early avoids costly structural repairs.

  • Boosts kerb appeal: A tidy, fresh wall adds charm and value to your property.

  • Enhances longevity: Proper repointing can extend a wall’s life by decades.

5. Common Types of Mortar Used

Choosing the right mortar is critical — and it’s not just about grabbing a bag of cement.

  • Lime mortar: Traditional and breathable, ideal for older walls.

  • Cement mortar: Strong but less flexible, may trap moisture in historic buildings.

  • Ready-mix blends: Convenient but need to match your existing wall colour and texture.

Experienced Stonemasons Northampton will assess and select the right mortar for your specific wall type.

6. How Repointing is Done: Step-by-Step

Let’s break down the process:

  1. Assessment – Inspect the wall to decide how much needs repairing.

  2. Raking out – Remove the damaged mortar using hand tools or a grinder.

  3. Cleaning – Brush out dust and debris for a clean surface.

  4. Mixing mortar – Carefully blend new mortar to match the original.

  5. Applying new mortar – Push into joints with a pointing trowel.

  6. Finishing – Neaten joints for a consistent look.

  7. Curing – Let the mortar set slowly to avoid cracking.

It might sound simple, but getting it just right takes skill and experience.

7. DIY vs Hiring a Professional

While some enjoy a good DIY challenge, repointing stone walls is not your average weekend project.

DIY Risks:

  • Using the wrong mortar

  • Damaging stonework

  • Poor finish that doesn’t last

If you’re unsure, it’s wise to consult experienced Collingtree Stonemasons of Northampton who know their trade and won’t cut corners.

8. How Long Does Repointing Last?

A well-done repointing job can last 20 to 50 years, depending on weather conditions, mortar type, and wall exposure. Lime mortar might need more frequent checks, but it’s gentler on old walls.

9. Repointing in Heritage Properties

Historic buildings need special care. Using cement mortar here can actually do more harm than good. Lime mortar is usually the best option, allowing the building to breathe and flex naturally with the seasons.

Heritage repointing also requires matching the colour, texture, and style of the original pointing to retain authenticity — another reason to go with expert Collingtree Stonemasons of Northampton.

10. Cost of Repointing Stone Walls in Northampton

Costs can vary, but here’s a ballpark:

  • Small garden wall: £300–£700

  • Full house wall: £1,500–£5,000+

  • Heritage property: Usually more due to skilled labour and materials

Get quotes from local experts to get an accurate idea.

11. Choosing the Right Stonemason

Look for stonemasons who:

  • Have local experience (like Collingtree Stonemasons Northampton)

  • Offer transparent quotes

  • Show examples of previous work

  • Understand traditional materials and techniques

A good stonemason will treat your wall like a piece of history — not just another job.

12. Mistakes to Avoid When Repointing

Don’t fall into these common traps:

  • Using cement on old stonework

  • Filling over damp or dirty joints

  • Rushing the curing process

  • Ignoring wall movement or structural issues

Get it wrong, and you may be back to square one in no time.

13. Repointing for Weather Protection

Repointing helps shield your wall from:

  • Rain: Keeps water from soaking in

  • Frost: Prevents freeze-thaw damage

  • Wind: Strengthens against shifting or erosion

It’s like putting a raincoat on your wall!

14. When is the Best Time to Repoint?

Spring and early autumn are ideal. Avoid freezing winter temps and scorching summer heat, as both can mess with mortar setting.

15. Maintaining Your Stone Wall After Repointing

You’ve spent the time (and money), so don’t let it go to waste. Here’s how to keep things in top shape:

  • Inspect annually for cracks or damp

  • Clear plant growth from the base

  • Check for drainage issues nearby

  • Clean gently with a soft brush

With a little love, your stone wall can last another century.

Conclusion

Stone walls are more than just bricks and mortar — they’re part of our homes, gardens, and heritage. Repointing might seem like a minor job, but it plays a huge role in keeping these structures safe and standing tall.

So whether it’s the garden wall your kids learned to climb or a heritage feature on your family home, don’t wait until it’s too late. Call on trusted experts like Collingtree Stonemasons of Northampton and give your stone wall the care it deserves.

FAQs

1. How often should stone walls be repointed?
Most walls need repointing every 20–30 years, but it depends on the mortar type and weather exposure.

2. Can I use cement mortar for old stone walls?
Not recommended. Cement can trap moisture and damage older stones. Lime mortar is usually best.

3. How do I know if my wall needs repointing?
Look for missing or crumbling mortar, damp patches, or loose stones — these are clear signs.

4. Is repointing expensive?
It varies. Small repairs may be affordable, but larger projects or heritage walls can be more costly due to the skills involved.

5. Can I repoint just a small section of my wall?
Yes! Localised repairs are common and can prevent the need for a full repointing job later on.