How to Know When Your Brickwork Needs Repointing (Clear Signs & What To Do Next)
Not sure whether your brickwork needs repointing or if it’s just ageing naturally? Cracked mortar, recessed joints, damp patches and loose brick edges are all warning signs. This guide explains what to look for, how serious it is, and what to do next.
Quick answer: If mortar is cracked, recessed more than 5mm, crumbling, or falling out across an area, repointing is usually required. If you’re also wondering about cost, see our detailed guide to repointing costs in Yorkshire.
Not sure whether it’s time to book the work yet? This guide explains the clear signs your brickwork needs repointing before damage spreads.
What are the first signs your brickwork needs repointing?
Mortar rarely fails overnight. It weakens gradually through moisture, frost, and natural weather exposure. The earliest signs are subtle.
- Mortar looking sandy or powdery
- Fine cracks along horizontal or vertical joints
- Joints sitting recessed from the brick face
- Small fragments of mortar collecting at the base of walls
Bricks may still look solid. That doesn’t mean the joints are. Mortar is the protective barrier that keeps water out.
How do you tell if mortar is failing or just ageing?
The finger test
Rub your finger across the joint.
- If it leaves light dust but remains firm, it may just be surface weathering.
- If it crumbles or flakes easily, deterioration has progressed.
The depth check
If mortar is recessed more than 5mm consistently, it is no longer shedding water effectively.
Does cracked mortar mean you need repointing?
Small hairline cracks are common around windows and corners. But repeated cracking along joint lines often signals movement or moisture stress.
When cracks follow mortar lines rather than bricks, repointing stabilises the structure before bricks begin loosening.
Not sure what you’re looking at?
Send us photos and we’ll tell you whether it needs repointing or just minor repair.
Can bad mortar cause damp inside your home?
Yes. Mortar joints stop wind-driven rain from penetrating the outer leaf. When they fail, water tracks inward.
- Damp patches after heavy rain
- Peeling paint near external walls
- White salts appearing internally
Where does mortar fail first on Yorkshire properties?
Yorkshire’s climate means wind-driven rain and freeze–thaw cycles. The most exposed areas deteriorate first.
- Chimneys and parapets
- South-west facing elevations
- Below leaking gutters
- Boundary walls without coping stones
How much does brick repointing cost in Yorkshire?
Pricing depends on access, mortar type, and area.
| Type | Typical Range |
|---|---|
| Standard cement repointing | £25–£45 per m² |
| Lime mortar repointing | £45–£75 per m² |
| Chimney repointing | £350–£800+ |
For a full breakdown of access costs, scope, and what’s included, see our detailed guide to repointing costs in Yorkshire .
Repointing vs Rendering: Which is right?
Repointing restores failing mortar. Rendering covers the surface. If joints are deteriorating, rendering does not repair the underlying issue.
| Factor | Repointing | Rendering |
|---|---|---|
| Main purpose | Restores mortar joints | Covers brick surface |
| Fixes failing joints? | Yes | No |
| Moisture handling | Breathable when correct mortar used | Can trap moisture if poorly installed |
How long does repointing last?
- 20–30 years for standard cement mortar
- 30+ years for appropriate lime mortar
Lifespan depends on workmanship, curing conditions, and exposure.
Frequently asked questions about repointing signs
Can you repoint over old mortar?
Failing mortar should be raked out properly. Skimming over old joints rarely lasts.
Does repointing stop damp?
If moisture is entering through open joints, yes. Other damp sources still need fixing.
How deep should mortar be raked out?
Typically 15–20mm to ensure strong bonding.
Does cracked mortar always mean structural movement?
No. Many cracks are weather-related. Consistent joint failure across an area usually indicates repointing is needed.
What should you do next?
If mortar is failing, acting early prevents more expensive brick damage.
