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Deck Flashing and Basement Water Problems
How to Install Deck Flashing the Correct Way
By Mark J. Donovan
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Years ago I decided to finish the
basement in my home, however I first had to deal with a water problem associated
with my deck. When the deck was installed the deck contractor used 1” Z
door/window flashing between the house clapboards and the deck boards. The 1”
height was nowhere near high enough to prevent the rain water from slipping up
behind the clapboards and going behind the 1” high flashing. To make matters
even worse, the deck contractor had put nails through the flashing as he
fastened the deck boards to the deck ledger board / floor joist.
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As a result, every time it rained
water would filter through the nail holes in the deck flashing and slide behind
the house clapboards below the deck. As a result, all the rain water that seeped
behind the clapboards worked its way down into the basement.
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To resolve this problem I had to
remove the deck boards nearest the home, and replace the Z window/door flashing
with 6” wide deck flashing that slid up 3” behind the house clapboards and down
over the deck ledger board that attached to the house. In addition I added an
additional deck floor joist about 2” away from the deck ledger board to use as a
nailing surface for the deck boards. Finally, I re-installed the deck boards.
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So if you have a basement water
problem that does not appear to be associated with ground water seepage,
check along the basement sills for water or moisture. Chances are you will
find that water is seeping in behind the house clapboards. If there is a
deck along that side of the home where you see the basement water problem,
most likely you have a similar deck flashing problem.
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