Post-Storm Roof Walk: What to Look For — Materials Compared
What to do about roof maintenance in the Valley in the first forty-eight hours, and what to leave until Monday.
After a storm the useful work happens in the first two days, and most of it is documentation rather than repair. This is what to do about roof maintenance in the San Fernando Valley once the wind drops.
What actually matters
Roofs in this climate do not usually fail from one dramatic event. They fail from debris nobody cleared, a sealant nobody renewed and a slipped tile nobody replaced, compounding quietly across several dry years until the first real storm finds all three at once.
What to do in the first forty-eight hours
Document before you touch anything: wide photographs to establish the property, then close photographs of each item of damage, all dated. Timing matters more than frequency. One visit in late autumn, before the rains arrive, is worth more than three spread randomly across the year. A tarp fixed through sound covering creates damage that was not there before.
How the San Fernando Valley changes the answer
Summer is the problem here. The Valley runs ten to fifteen degrees hotter than the coast and holds it for weeks, so a roof surface that reads 90 degrees in Santa Monica is well past 160 in Van Nuys by mid-afternoon. Everything on the roof expands into that heat and contracts again overnight, and it is that daily movement, not the peak temperature, that opens laps and backs fasteners out. Most of the housing went up between 1950 and 1975, which means original decking, undersized ventilation and at least one previous layer that somebody roofed straight over rather than tearing off.
What we look at on an inspection
- Gutters, valleys and drainage cleared and flowing
- Sealant condition at every penetration and transition
- Slipped, broken or missing units across the field
- Flashing and counterflashing at walls and chimneys
- Tree overhang and any branch making contact with the surface
- Ventilation openings clear and unobstructed
- Interior ceiling and attic check for early staining
Common questions
Should I get a tarp on it straight away?
Only once it is photographed, and only if it can be fixed without putting new holes through sound covering. A badly fixed tarp creates damage that was not there before.
How soon do I need to report it?
Check your policy, because most impose a reporting window. Reporting early costs nothing and protects the claim.
The honest summary
Nothing on a roof stays fixed by itself. An hour of attention before the rains prevents most of what would otherwise become an emergency in December. In the San Fernando Valley the thing to watch is attic temperature and intake ventilation, because a Valley attic that cannot breathe cooks the underside of the roof as hard as the sun cooks the top.
Free inspection, drone photography where access is difficult, and a written estimate with deck repair priced per sheet. No obligation.