Building a Weatherproof Deck

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Bill Yasinski perched on his newly completed deck in Catskill, NY. Measuring 10 feet by 18 feet and designed as an elevated entryway to Mother's log cabin; the deck, complete with footings, took just over two days to build.
Bill Yasinski perched on his newly completed deck in Catskill, NY. Measuring 10 feet by 18 feet and designed as an elevated entryway to Mother's log cabin; the deck, complete with footings, took just over two days to build.
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Diagram 1: Major deck components.
Diagram 1: Major deck components.
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Diagram 2: Deck posts.
Diagram 2: Deck posts.
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Diagram 3: Butt joints.
Diagram 3: Butt joints.
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Diagram 4: Deck ledger.
Diagram 4: Deck ledger.

Building a weatherproof deck that will stand up to any climate or condition. (See the deck building diagrams in the image gallery.)

Building a Weatherproof Deck

I learned how not to build a deck one day this spring when mine threatened to fall off the house. I didn’t build that deck, understand. It came with the c.1970 mountainside cabin I retreat to now and again. But, to be honest, if I had built the deck by the standards of its day, the same problem might well have occurred.

Though mankind has been erecting wooden buildings for millennia, we seem to learn mainly through hard experience … and open-to-the-weather, natural-finished wood decks are a comparatively new idea. They didn’t begin to replace traditional roofed entry stoops and porches till the concept of an “outdoor room” became popular during the postwar housing boom of the late 1940s and early 50s.

Lacking a porch’s roof and water-resistant painted finish, the wood of a deck is fully exposed to the elements. And it took a while for us to learn how to build and maintain a structure that has all of nature’s processes allied against it—the wood alternatively soaked and dried, frozen and sun-baked, assaulted by forces of wind and snow, hail, and acid rain, plus, on muddy days, battering from your youngsters’ Big Wheel. From nature’s perspective, deck lumber is nothing but dead wood to be recycled into forest mold, and the mold into plant nutrients to fuel new growth. Woodpeckers, gnawing bugs, and mildews will attack it from the outside, termites and bark beetles and carpenter ants will bore in and tunnel through the inside, and whole legions of fungi, rot molds, and bacteria will infiltrate it. Together, they can convert a shiny new kiln-dried fir or spruce 2 inch by 4 inch by 8 foot stud to a heap of sawdust in a very few years.

  • Published on Jun 1, 1996
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