Why brick needs a seasonal eye

Brick is one of the most forgiving materials in British architecture. It handles rain, wind and frost far better than many modern claddings, and with a little care it can look good for centuries. But forgiving is not the same as maintenance-free. Most masonry problems begin quietly: a hairline crack in a mortar joint, a blocked gutter, a raised path that funnels water towards the wall. Left alone, these small faults let moisture into the brickwork or the cavity, and once water is in, frost can do real damage.

The key is to work with the seasons rather than against them. A wall that is inspected and repaired at the right times will dry out more readily, resist frost, and need less drastic intervention later. The advice below is practical, low-tech, and suitable for most traditional UK homes, whether solid-walled Victorian brick or a modern cavity-wall extension.

Spring: inspect and repoint before growth takes hold

Spring is the best time to get up close to your elevations. The worst of the frost has passed, plants are starting to grow, and the wall has had winter to reveal its weaknesses. Walk around the property and look carefully at mortar joints, especially on south and west-facing walls that take the driving rain. Tap joints gently with a metal tool: a dull thud suggests the mortar is sound, while a hollow ring or crumbling edge means it is ready to fail.

• Check mortar joints: Look for recessed, sandy or cracked pointing. If you can scrape it out with a finger, it is too soft.
• Look for movement: Step back and check for bowing, leaning or stair-step cracks near corners and lintels.
• Clear air bricks: Make sure sub-floor vents are not blocked by soil, gravel or planters. Good ventilation keeps timbers dry.

If repointing is needed, use a lime-based mortar on older solid walls. A mix of lime putty and sharp sand, or a natural hydraulic lime such as NHL 3.5, is softer and more breathable than cement. Rake out the old mortar to about 15–20mm deep, wet the joint, and press the new mortar in firmly. Finish it slightly recessed, not proud, so water can run off rather than sit on the ledge.

Summer: clean gently and let the wall breathe

Warm, dry weather is ideal for cleaning, because the wall can dry quickly afterwards. The golden rule is to start with the gentlest method. Most brick facades only need a soft brush, a stiff hand brush and plenty of clean water. Avoid pressure washing at high settings, which can blast away the fired skin of the brick and force water deep into the wall.

• Dry brushing: Remove cobwebs, dust and loose organic growth with a soft masonry brush.
• Efflorescence: White salt deposits are usually harmless. Brush them off dry, and do not seal the wall. They will stop once the source of moisture is corrected.
• Vegetation: Cut back ivy, wisteria and climbing roses. They hold moisture against the brick and can force roots into mortar joints.

If the wall is very dirty, use a pH-neutral masonry cleaner and test a small patch first. Never use a strong acid on historic brick or limestone. After cleaning, consider a breathable limewash if the wall was originally coated. Avoid silicone-based sealers: they trap moisture and can lead to spalling, where the face of the brick flakes away.

Autumn: drainage and gutters are your best defence

Water is the enemy of masonry, and most damp problems start at roof level or ground level. Autumn is the time to clear gutters, check downpipes and make sure water is carried away from the wall. A gutter that overflows in a storm can soak a wall in minutes, and repeated soaking is what leads to frost damage in winter.

• Clear gutters and hoppers: Remove leaves and moss. Check that joints are sealed and that the gutter falls towards the outlet.
• Check downpipes: Confirm they are connected to a drain or soakaway, not discharging onto the wall base.
• Ground levels: Keep soil, paving and gravel at least 150mm below the damp-proof course. If a path has been raised over the years, lower it or install a French drain.

Also check external plinths, garden walls and retained beds. A raised flower bed against a brick wall acts like a sponge, keeping the base of the wall permanently damp. Where possible, leave a clear air gap between planting and masonry.

Winter: manage frost and monitor

Frost damage happens when water inside the brick or mortar freezes, expands, and pushes the surface outwards. You cannot stop every freeze, but you can reduce the risk. Make sure the wall can drain and dry: clear any blocked air bricks, keep gutters working, and avoid adding impermeable coatings just before winter.

Do not repoint or clean masonry during a frost. Mortar needs above 5°C to cure properly, and water used for cleaning will freeze in the pores. If you notice spalling after a cold snap, photograph it and monitor it. A few flakes are cosmetic; a hollow, drummy area or a crumbling lintel needs professional advice. Winter is also a good time to check internal ventilation, especially in kitchens and bathrooms, because warm moist air migrating through a wall can worsen external frost damage.

A simple yearly rhythm

You do not need a rigid schedule, but a light seasonal routine will keep brickwork in good order without becoming a chore. Think of it as four small jobs rather than one big repair.

• March to May: Inspect mortar joints, repoint where needed, clear air bricks and check for movement.
• June to August: Clean gently, remove vegetation, and touch up any breathable coatings.
• September to November: Clear gutters, check downpipes, lower ground levels and improve drainage.
• December to February: Monitor after frost, avoid wet work, and keep an eye on any damp patches inside.

Brick facades reward attention. A little time spent on pointing, cleaning and drainage each year will protect both the appearance and the structure of your walls, and it will help you avoid the costly cycle of damp, frost and repeated repairs. If a wall is bulging, persistently damp, or showing deep cracks, call in a chartered surveyor or conservation-accredited professional before you start work. For everything else, gentle, seasonal care is usually the best approach.