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Question DetailsAsked on 5/3/2017

We have a roof deck with an exterior door that allows water to leak into the ceiling. Who can we call to diagnose?

We have had a roofing professional come out and tell us the roof is fine and it is the threshold that is causing the issue and to install a storm door. We know it is our roof or the door because it only leaks when there is rain and it seems to only be wind blown rain. We've had a dooring professional come out and tell us we just need a new threshold.

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4 Answers


While a Door professional would undoubtedly be best, getting one out for a repair is usually tough unless warranty work, so handymen usually end up doing it.

There are several common places for water to get into doors, especially when wind-blown:

1) under the door sill - the piece of house framing (common 2x4, 2x6 or 2x8, which should be treated wood) which commonly (but not always) exists under the threshold as the bottom plate of the wall the door goes through

2) under the door threshold (the part of the door frame which you step on going in and out of the house)

3) at the ends of the threshold or sill where it meets the side casing/frame - should becaulkedbut rarely is

4) water running down the stop strip or weatherstrip on the sides of the frame, then in on the thresheld because the weatherstrip/stop strip is not sealed to the threahold at the bottom - or missing door top and side weatherstripping at the outside face of the door (usually mounted on the stop strip for inward opening doors, so it is compressed between the closed door and the stop strip.

5) over the top of the threshold, under the door, because there is no weatherstripping there

6) or commonly with wind-blown rain, because the threshold is not sloped to the outside or because there is no dripedge on the bottom of the door (shown here) to make the water running down the door move out to the deck or porch -

7) water seeping under the door sill direct from the deck/porch - sometimes because the deck/porch is higher than the interior floor, sometimes through gaps in the sill under the door,like on porches where the deck boards penetrate into the house under the entry, providing a wicking route for exterior water to come in under the door (and commonlyo under the interior flooring as well).

8) lack of caulking or head flashing (over the door), letting water get in around the door casing/frame and run down in the rough opening to appear at a lower point.

9) One less common, but may be applicable to your case if a membrane roof is the leak may be under the threshold, through fastener holes for the threshold or sill. Ideally the water should be stopped before it gets under the threashold or sill, but if the threashold or sill is removed, there should be a glob of silicone caulk (or roof bitumastic/asphaltic sealant if asphaltic or shingle roof) put where the fasteter will penetrate into the roofing to forestall that source of leakage.

The solution is to track every possible water entry point, and caulk/seal all entry points (bearing in mind sone aluminum thresholds have drain channels on the outside front lip which should stay open to drain), and use flashing or door sweeps and/or rain drip sweeps to divert the water from the door back out to the porch or deck.

You may well need a new threshold if it does not slope outward or is deteriorated - or may be caulking and weather stripping and door drip sweep may stop the entry of water.

Answered 3 years ago by LCD



This is James in Member Care. Thanks for your interest in Angie's List!

We'll be happy to help find top rated roofing services or providers from our "Decks & Porches" category, but it doesn't look like you have a subscription to the List yet. You can join by visiting or by giving us a call. Our call center is available 8:00 am-9:00 pm weekdays and 8:00-5:00 pm ET on Saturdays.

Thanks for your question and we look forward to assisting you!

Answered 3 years ago by Member Services


I had ever the same issue several years ago, until I installed the new threshold.

I recommend the threshold of KSL GLOBAL. Their product is still firm in these years.

Answered 2 years ago by Barneyksl


I had ever the same issue several years ago, until I installed the new threshold.

I recommend the threshold of KSL GLOBAL. Their product is still firm in these years.

Hope it can help you.

Answered 2 years ago by Barneyksl

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