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Building A Hex Deck

Decks, Decks, Outdoor Living March 10, 2010 Sonia

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By Monte Burch

Building a Hexagonal Extension to a Deck



Remodeling a deck to suit your lifestyle is a great way of bringing new life to your home. The old deck shown in this article adjoined a bedroom and had steps leading off a narrow walkway. The steps were in the wrong place when a new cooking area was added to the existing deck. New steps were added to make access easier and the former step area was turned into a sitting area for two, just off the master bedroom. A small, half-hexagon-shaped deck extension provided a great place for early morning coffee or evening relaxing. The same design, however, could be used on a new deck to add interest and a tête-à-tête area.

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In the deck shown, the outer step and rail support posts were simply cut off the same height as the existing deck to provide support for the deck extension. This created a smaller (48-inch) outer section to match the width of the step posts, with 5-foot adjoining sides. These angles were a bit hard to work with, so the drawings show how to create a standard shaped hexagon with 60-degree angles. The small size could also be increased, but more support would be needed. Although the construction appears complicated, it’s fairly easy if the angles are carefully cut. Take your time and check each piece before you cut.

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Hexagon Railing Layout.

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The first step is to mark a level line from the deck girders or joists to the outer support posts.


First Steps

If building a new deck or extension on an existing deck, you will need to install support posts for the outside corners. Locate the post holes and dig them to the depth needed. Place the posts in position, making sure they are properly located and plumb. Then add pre-mixed concrete around the posts to anchor them in place. Allow to set at least 24 hours.

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Using a hand or circular saw, cut the posts to the correct height.

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Use a square, mark around the posts.

First step in the construction shown was to remove the old steps, railings and even the old deck boards.

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The outer corners of the posts are cut at an angle. Mark for angled cuts on the posts, first on the top, then depth of joists, and then down the sides to meet the other lines.

The second step is the same if building with new outer posts. Using a 4-foot level and a straight-edge board, mark a level line from the top of the existing deck joists to the outer corners of the outer support posts. Then, cut off the posts at the correct height.

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Post & Joist Detail.

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Using a sharp handsaw, make the vertical cut from the top of the post.

Before building, consult local codes for code compliance. The entire deck was assembled with Wolmanized Residential Outdoor Wood, pressure-treated lumber to match the existing deck. The deck was also assembled using deck screws. My choice for all deck work is Phillips II Plus Premium Exterior Screws. I’ve been using them with pressure-treated wood for a number of years with excellent results and durability. These screws come with a matching driver head in the box and are extremely efficient and easy to use with no stripping of the heads. A Bosch 18V Impactor impact driver made quick and easy work of the assembly.