How to repair a skylight leak on a metal roof

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Repairing a skylight leak that has a metal frame

Repairing a Skylight with metal frame

Watch this video on how to seal between the glass and metal frame of an old-style skylight. The seal between the glass and metal frame is what deteriorates and then cause the skylight to leak. Without removing the metal frame and replacing the seal we can make a transition that will never crack again.

How to repair a Metal Roof Leak on Skylight Flashing

Total Time: 20 minutes

Rubber membrane

Another method to repair skylight flashing on metal roofs is to use the Modified Bitumen Rubber membrane to make the transition.

Preparation

We clear all the old tar and caulking from the flashing.Cleaning the old tar and caulking off the flashing

Torch Down Rubber

we cut a modified Bitumen membrane that will fit in between the risers of the panel and overlap the flashingCut a rubber membrane to size to use as flashing

Using Karnak 81 Trowel

Adhere the membrane to the metal surface. We use Karnak 81 or Karnak 66 trowel grade. We smear the Karnak the entire surface of where the rubber membrane will cover and then place the membrane in place. We then roll out all the air trapped to make sure the rubber membrane is fully attached to the metal.Applying Karnak 81 Trowel grade to the metal roof surface to install the ribber membrane

This method is very effective. The rubber membrane can move and stretch with metal panels as it expands and contracts.

Attaching rubber to metal flashing
Attaching the rubber membrane to the metal with Karnak 81 trowel grade

What causes a skylight to leak?

Most skylights have a metal frame that holds the glass in place. Between the metal frame and the glass is a rubber gasket. This rubber gasket shrinks and dries out. The metal frame is also not too tight and space opens up between the frame and the rubber gasket which causes water to leak through.This skylight is leaking between the glass and the frame

Can skylights be repaired effectively?

Yes, but not with caulking. Most repairs we have seen were done with caulking and that never works. We use a product called Super Silicone Seal to seal the transition between the frame and the glass.
Super Silicone Seal used to repair a skylight leak

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