You do not need to be a roofer to prevent the most common monsoon-season roof problems. Most of them stem from neglected maintenance that becomes obvious only when 60mm of rain falls in twenty minutes. By then it is too late.
Here are eight checks worth running before the heavy rains arrive each year.
1. Walk the boundary and look up
Stand on the footpath and look at the roofline from at least three angles. Note any tiles that look darker than their neighbours (a hint of moisture), tiles visibly out of alignment, or ridge capping that has separated. Photograph anything suspicious.
2. Clear the gutters — actually clear them
"Cleaned" is not the same as "cleared". Leaves and silt accumulate at the outlet end, not where you can see from the ladder. Flush with a hose end-to-end and watch the downpipe. If the flow is weak, the blockage is further down.
3. Test every downpipe
Each downpipe should discharge to a rainwater drain that is not blocked at ground level. Once a year, take a torch to the bottom of each downpipe and check for compacted debris. Five minutes here saves a flooded driveway.
4. Inspect the attic on a sunny day
Climb into the attic on a clear afternoon. Look for daylight at the ridge line, water staining on truss timber, and dampness on the underlay membrane. Anything found here is worth investigating before the rain finds it for you.
5. Clear overhanging branches
Tree limbs that touch the roof drop debris into gutters, scratch protective coatings and provide highways for ants and termites into the eaves. Trim back at least a metre of clearance.
6. Check valleys and skylight seals
Roof valleys collect more water than any other section during heavy rain. Look for accumulated leaf litter and check that flashing edges are still bedded. Around skylights, run a finger along the sealant — if it is hard and cracked rather than slightly tacky, it has failed.
7. Test the rainwater outlets at ground level
Many monsoon "leaks" are not leaks at all — they are back-flow from blocked stormwater drains. Pour a bucket of water into each outlet and watch where it goes. If it pools, clear the drain before the season starts.
8. Note the leak you keep meaning to call about
The small ceiling stain you have lived with for six months will not heal itself. October is the cheapest month to commission a small repair. By the time the leak is dripping into a saucepan in December, your contractor is fully booked and the damage has tripled.
If you have any doubt about the answers to checks four, six or eight, get a roofer to walk the property. A 45-minute inspection costs less than one ceiling repaint.