Homeowner's Guide to Building Maintenance
Updated: 1 day ago
Every home tells the story of how well it has been looked after. In South Africa, that story is written mostly by water. Whether it is a Highveld thunderstorm, coastal humidity, or winter condensation creeping across a bedroom wall, moisture ingress is behind the majority of building deterioration we see. Left unnoticed, a small leak or a persistent damp patch becomes an open invitation to mould and pests, and a repair bill that grows quietly for years.
The good news: most of this is preventable with a simple routine. This guide walks you through what to check each season, what you can confidently do yourself, and the moments where calling in a professional is genuinely the cheaper option.
Why Is Moisture the Root Cause of Building Damage?
Think about how your home is built. Brick and plaster absorb water. Timber swells and rots. Steel corrodes. Paint bubbles and peels. Even concrete and roof membranes slowly break down under repeated wetting and drying.
So when something goes wrong, the question is almost never "what is broken?" but "where is the water coming from?" A stain on a ceiling point to a roof leak above it. Bubbling paint on an interior wall usually means moisture is moving through the wall from outside or below. And where there is persistent damp, two tenants move in fast: mould, which takes hold on damp surfaces within 24 to 48 hours, and pests, from dampwood termites to cockroaches, which are all drawn to the same conditions.
That is why a maintenance checklist that focuses on keeping water out, and drying your home out, protects both your building's structure and your family's health.
What Should You Check Each Season?
Spring (September to November): Get Ready for the Rains
For most of the country, spring is your window to prepare for summer rainfall. Use it.
Clear gutters, valleys, and downpipes of leaves and debris so stormwater can flow freely.
Check the roof from ground level with binoculars: look for cracked, slipped, or missing tiles, damaged ridge caps, and lifting sheet-metal seams.
Inspect flashing around chimneys, gullies, and where the roof meets walls. Flashing is a common leak point.
Seal gaps around window and door frames with a good exterior sealant.
Check the waterproofing membranes on flat roofs, balconies, and patios before the first big storms arrive.
Trim trees and creepers away from the roofline. Branches that touch the roof damage tiles and give rodents a bridge into your roof void.
Summer (December to February): Storms and Humidity
After every major storm, check ceilings and the tops of wardrobes for new water stains. Small marks are easy to fix; ignored ones become ceiling collapses.
Re-check flashings and roof seals if you have had heavy rain.
Manage indoor humidity: run bathroom extractor fans during and after showers, and use kitchen extraction when cooking.
Check under sinks, around the geyser, and behind the washing machine for slow leaks. A drip you can see today is a subfloor problem next year.
In coastal areas, hose down salt residue from windows, doors, and balustrades. Salt accelerates corrosion.
Watch for early mould signs in bathrooms and laundries: a musty smell that lingers after cleaning is your first warning.
Autumn (March to May): Dry Weather Is Repair Weather
Walk the exterior walls and look for damp patches, tide marks, or a white salty powder (efflorescence) on brick and plaster. These are signs of rising or penetrating damp.
Check subfloor vents and crawl spaces are clear and unobstructed. Good under-floor airflow keeps rising damp at bay.
Inspect exterior paint. Bubbling and peeling paint is usually trapped moisture trying to escape, not just old age.
Repair cracks in walls and plaster now, while the weather is still dry. Use a flexible exterior filler and repaint over it.
Check the geyser drip tray, overflow pipe, and drain are clear and rust-free.
Look over wooden windows, doors, fascia boards, and decks. Sand back weathered areas, treat, and seal before winter.
Winter (June to August): Condensation and Quiet Intruders
Ventilate daily, even when it is cold. Condensation running down cold windows and walls is winter's biggest mould trigger. Open windows for ten minutes rather than sealing the house up.
Pull wardrobes and furniture slightly away from external walls so air can circulate behind them. This is where black mould so often starts.
In the Western Cape and other winter-rainfall regions, watch ceilings and roof spaces for leaks after each cold front.
Check the roof void for signs of rodents: droppings, gnawed wiring or insulation, nesting material. They move indoors when the cold arrives, and gnawed wiring is a fire risk.
Confirm that extractor fans, wall vents, and ceiling vents are working and unblocked.
Before lighting the first fire of the season, check the fireplace and flue for blockages, cracks, or bird nests.
Which Home Maintenance Jobs Should You Do Once a Year?
Put these on an annual calendar, whichever month suits you:
A thorough roof inspection, including flashing, ridges, and waterproofing.
A damp assessment on any wall that has shown signs, even if you painted over them.
Geyser service, including the safety valve and sacrificial anode.
Treatment and sealing of all exterior timber.
Cleaning and inspection of stormwater channels, French drains, and garden soakaways.
A professional pest inspection, particularly for termites, which work quietly behind walls for years.
Servicing of gas appliances and their flues.
Which Jobs Can You DIY, and When Do You Need a Professional?
There is a satisfying amount you can handle yourself.
Well within DIY territory: cleaning gutters and downpipes; re-sealing around baths, basins, and showers with quality silicone; filling minor exterior cracks with flexible filler; clearing vents and subfloor openings; monitoring ceilings and walls for new stains; washing and sealing exterior timber; and basic ventilation habits like using extractor fans.
When to bring in a professional:
Damp patches that return. If a wall stays damp or stains come back after cosmetic repairs, you need someone to find the actual source. Rising damp, for example, requires a proper damp-proofing intervention, not paint over it.
Mould that covers a large area or keeps coming back. Mould is a symptom. A professional identifies whether the cause is a leak, condensation, or rising damp, and tests whether you are dealing with cosmetic mould or something requiring remediation.
A musty smell you cannot locate. Hidden leaks sit inside walls and ceilings. Moisture mapping and thermal imaging find the wet spot without opening up your home first.
Termite or rodent activity. These infestations need trained treatment, and the conditions that let them in need correcting too.
Failed waterproofing on flat roofs, balconies, and showers. A membrane applied incorrectly leaks into the rooms below it. This is not the place to learn on the job.
Any work above single-story height. A roof repair done once, properly and safely is cheaper than a hospital visit.
Frequently Asked Questions
What is the difference between waterproofing and damp proofing?
Waterproofing keeps liquid water out of surfaces exposed to weather or use, such as roofs, balconies and shower floors. Damp proofing blocks moisture that rises through walls from the ground, known as rising damp. The two treat different moisture paths, so the right solution depends on where the water is coming from.
How do I know if my home has rising damp?
Look for tide marks or staining low on ground-floor walls, peeling paint, and a white salty powder (efflorescence) on brick or plaster. If a damp patch returns after you have repainted, moisture is still moving through the wall. A professional moisture survey confirms whether it is rising damp, penetrating damp or condensation.
Is mould in my home dangerous?
Mould affects indoor air quality and can trigger allergies, asthma and respiratory irritation, especially in children and people with existing conditions. Small patches on hard surfaces can be cleaned safely with the right protection. Mould that keeps coming back, or covers a large area, is a symptom of a moisture problem that needs professional assessment.
What attracts pests like termites and rodents into a home?
Pests follow moisture, warmth and food. Damp timber invites dampwood and subterranean termites, and rodents move into roof voids when winter arrives, often using branches that touch the roof as a bridge. Fixing leaks and ventilating properly is the first step in pest prevention, before any treatment.
How often should a South African home be inspected for damp and pests?
Do the seasonal checks in this guide yourself four times a year, and book a professional inspection annually. Homes older than 20 years, homes near the coast, and any property after a major storm or roof repair benefit from a professional moisture and pest assessment sooner.
Can I fix damp myself with paint or sealant?
Damp-proof paints and sealants hide the symptom for a while, but the moisture stays in the wall and the damage continues behind the coating. If the damp returns after a cosmetic repair, the source needs to be found and remediated properly.
The Bottom Line
Buildings do not fail suddenly. They fail slowly, one wet season at a time, in places nobody looks. A few hours each season, spent on this checklist, is the cheapest maintenance plan you will ever find. And when a check turns up something you cannot explain or fix, that is exactly the moment to get a professional assessment rather than wait for the ceiling to tell you.
At Building Science Inspectors, we specialize in finding the source: moisture mapping, thermal imaging, damp assessments, mould testing, and targeted remediation plans that fix the cause, not just the stain. If something on this checklist raises a question about your home, call us for support or book an inspection.
Related Reading
These guides cover the rest of the moisture picture:
Book Your Damp & Mould Inspection
If a seasonal check has turned up a damp patch, a musty smell, or mould that keeps coming back, the next step is a professional assessment. Our Damp & Mould Inspection uses moisture mapping and thermal imaging to find the true source of the problem, so you get a clear, prioritised remediation plan before small issues become major repairs. Book your Damp & Mould Inspection online or call us on 084 675 0179.
