Identify the covering
Felt, sheet materials and membranes need different repairs.
Check wall junctions and free edges
Wind can get beneath loose trims and rain can track down an abutment.
Older sheet roofs need caution
Some garages contain asbestos cement; suspected material should not be drilled or broken before identification.
Want a roofer to look at it?
Describe what you can see and the weather in which the problem appears. That gives the roofer a useful starting point.
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