How to repair a leaking roof valley flashing during heavy rain?
Rainwater is leaking into our attic right along the internal valley intersection where two roof slopes meet in Sharjah. What emergency waterproofing tape, rubberized mastic, or temporary tarp installation stops active rain leaks until dry weather permits flashing replacement?
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Expert Answers 1
For an active leak in a roof valley, don’t try to seal the wet joint with ordinary mastic—it usually won’t bond properly. If it is safe to access the roof, cover the valley and the leaking area with a heavy-duty tarp, securing it above the valley so water runs over it rather than underneath.
For a small accessible gap, a self-adhesive butyl flashing tape can work as a temporary patch, but the surface needs to be as dry and clean as possible. Avoid relying on rubberized sealant as the main repair during heavy rain.
Once the roof is completely dry, the valley flashing should be inspected and properly repaired or replaced. If water is already entering the attic, keep clear of any wet electrical wiring or fittings.
For a small accessible gap, a self-adhesive butyl flashing tape can work as a temporary patch, but the surface needs to be as dry and clean as possible. Avoid relying on rubberized sealant as the main repair during heavy rain.
Once the roof is completely dry, the valley flashing should be inspected and properly repaired or replaced. If water is already entering the attic, keep clear of any wet electrical wiring or fittings.
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