The role of mortar joints
Mortar does more than hold bricks together. It is the sacrificial part of a wall, designed to wear before the bricks or stone do, and it controls how water enters and leaves the masonry. When joints erode, crumble or fall out, rain soaks into the wall, frost damages the masonry, and damp may appear indoors.
Spotting failed joints
- Joints recessed deeply behind the brick face
- Crumbling, sandy or powdery mortar
- Gaps or holes where mortar has fallen out entirely
- Hairline cracks between mortar and brick
- Plants taking root in the joints
- Damp patches indoors on walls facing weather
Selecting the right mortar
This is the most important decision. Modern buildings with hard bricks generally suit a cement-based mortar, while older properties should be repointed in lime. On soft old bricks, strong cement mortar traps moisture and damages the brick faces. We test and identify the existing mortar where possible, and choose a mix that is slightly softer than the masonry. See our guide to traditional lime repointing.
The restoration process
- Rake out the old mortar to a suitable depth, usually about twice the joint width, taking care not to damage the edges of bricks
- Brush out dust and dampen the joints
- Press in new mortar in layers so it bonds fully
- Finish to a profile matching the original or suited to the exposure
- Clean down and protect the new work while it cures
Not just repointing
If joints have failed because of an underlying problem such as a leaking gutter or movement in the wall, we correct that too. Wide joints that follow a crack may point to movement, see crack stitching. Bricks damaged by long exposure may need replacement.
Exposed locations
Tynemouth and other coastal elevations take driving rain and salt-laden wind, so joints on exposed walls can fail sooner than those on sheltered streets. Weather during the work matters too, as mortar needs protection from frost and quick drying. Alterations in conservation areas may need consent, see the Planning Portal.
Frequently asked questions
How do I know if my pointing needs redoing?
If mortar is crumbling, deeply recessed, cracked or missing in many places, it is probably time. A few isolated defects can be repaired locally.
Can I use cement mortar on any wall?
No. On older, softer masonry cement is usually too hard and causes damage. The mortar should be softer and more permeable than the brick or stone.
