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Question DetailsAsked on 7/10/2017

is it okay to drain the flashing underneath the tile?

flashing around atrium drains the water underneath the tile. Is this good practice?

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1 Answer


Can you answer back, using the yellow Answer This Question button right under your question, with more details - are you talking inside or outside flashing, is the tile grouted down or loose-laid in sand, etc ?

Sometimes, for indoor atriums especially, there will be a collector drain, like a french drain, around the inside perimeter of the foundation, which the base flashing (in place of baseboards) drains into to drain away misted watering water and condensation off the windows. However, lacking that, the flashing would run out on TOP of a hard surface floor - commonly concrete (with whatever type of finish or coating it has) or grouted in place tile, so basically a "waterproof" flooring which catches and presumably is sloped to drain away the water, so for that type floor the flashing should come out on TOP of it (with an airgap under it to allow for floor cleaning and to prevent wicking in underneath. The flooring and/or wall (like concrete footer) would also typically have a raised edge floor (the outer 4-6 inches sloping toward the center) or a tile base or such toi divert any water getting on the base of the wall back to the floor.

The same sort of arrangement, sometimes with french drain and sometimes with strip or trench type slot drain, is at times used on the exterior of atriums, pools, greenhouses, sunrooms etcwithout gutters to trap the runoff water - most commonly where there is a patio or walkway right around the perimeter.

Answered 3 years ago by LCD

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