Preparing your roof before the summer storms
The dry months before the storms are the best time to look at a roof, because waterproofing needs a dry surface and because a fault found now is cheaper than one found in a downpour. This is a practical checklist.
Why the dry months are the time to work
Most waterproofing systems need a dry, clean surface to bond and cure, and the summer storms make that hard to find. Gauteng's rainy season starts in October (source: JT Roofing), so the weeks before it are the practical window. Work placed then is easier to schedule, and it starts the season in a much better state than a repair rushed inside the rain.
There is a second reason. In the dry months a contractor can see the roof clearly and find the small faults, rather than working around water and weather. Preparation is where waterproofing lives, and it is easier to do it well in a dry spell.
The pre-season check
You do not have to climb the roof to do most of this. From the ground and from inside, note what you can: cracked or slipped tiles, a sagging gutter, a stain on a ceiling, damp on a wall after rain, or water that stands on a flat roof long after the rain stops. Then have a contractor look at the parts you cannot see.
- Clear the gutters, valleys and outlets of leaves and debris.
- Check the downpipes actually carry water away from the wall.
- Look for cracked, slipped or missing tiles after the winter.
- Check the ridge line, where the mortar cracks over the years.
- Look at the flashings around chimneys, vents and parapets.
- On a flat roof, check for water that stands after the rain.
- Note any ceiling stain, and where it sits relative to the roof.
What to fix now, and what can wait
Drainage cannot wait: a blocked gutter or valley causes damage fast, and clearing it is the smallest job on the list. Flashings and ridge mortar are worth fixing before the season, because they are the details that fail first. A coating or membrane that has reached the end of its life is better renewed now than patched through the season.
What can wait is anything that is genuinely sound. A roof in good order does not need work just because the season is coming; it needs the drainage cleared and a look over. A contractor who tells you the roof is fine is doing you a service.
After the storms start
Once the rain arrives, keep an eye on the same things: gutters that fill again, a new stain, or water standing on a flat roof. If a leak appears, act on it, but expect a contractor to make a temporary repair while the roof is wet and return for the permanent fix when it is dry. Booking that return visit early matters, because the good contractors are busy in the season.
A short note on safety
Everything in this checklist that can be done from the ground should be done from the ground. Gutters can be cleared safely from a ladder with someone holding it, and a ceiling stain can be noted from inside. The roof itself is not a place to work without the right equipment and a head for heights.
If you are not sure something is safe to reach, leave it to the contractor. A fall from a roof is a far worse outcome than a leak, and a contractor who is coming anyway can look at the faults you can see from below and the ones you cannot.
Frequently asked questions
When is the best time to waterproof a roof in Johannesburg?
In the dry months before the storms, when the surface is dry and the contractors are less booked. Dry gaps during the season also work for smaller jobs.
Do I need to waterproof a roof that is not leaking?
No. If the roof and its coating are sound, clear the drainage and leave it. Waterproofing is for a roof that needs it, not a yearly ritual.
Can a roof be inspected in the rainy season?
Yes, and a wet roof can make a leak easier to find. The work itself is usually done dry, so an inspection now and the repair later is a common sequence.