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Question DetailsAsked on 8/2/2016

Stop my alumiun roof on my screen patio from leaking

My screen patio alumiun roof leaks where attached to the house

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1 Answer


Below are a couple of prior similar questions with answers - but in essence the right fix is that the roof wataerproofing (ice and water shield, water barrier, and roofing or a flashing strip as applicable - should overlap from the roof onto the porch roof to provide continuity to the runoff from one roof to the next, and to catch/prevent backup or blowing-under or splash-under of water from the bottom roof back up under the first one.

Exactly how the sealing is done depends on design of the interface of the two roofs - from continuous run-over if same slope and elevation at the interface, to transitioning cie and water shield from upper roof onto top edge of bottom roof, overlaid by a formed (possible a foot or two wide) metal flashing to keep lower roof backup from wetting the sheathing and fascia of the upper (original) roof.

You can find lots of sketches and photos of how this is done in various cases by googling this search phrase - images for roof transition waerproofing - just bear in mind not all will necessarily be correct, but you basically just have to keep in mind the intent is to prevent blow-under and splash-under, and to ensure that any water accessing the interface - over or under the roofing surface, has to make its way to the surface on top of the lower roof, so follow the flow path to ensure every possible route is covered. And don't forget possible backup from snow or ice damming, too - one reason why this type of roof is generally better built at a slightly lower elevation than the upper one to provide a distinct dropoff and room for a substantial backup dam height.

Roofing would be your Search the List category for a contractor.

Answered 3 years ago by LCD

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