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How Do You Lay Deck Boards on a 45 Degree Angle?

Angled Deck Board Patterns

Add a touch of creativity to your family’s outdoor space without going over the top by installing your decking at a 45-degree angle. A perfect choice for any decking material from pressure-treated lumber, hardwoods, and cedar to composite and PVC deck boards; the angled gives your new build or deck remodel a whole new depth. Learn how to lay and install your brand new deck boards along an angle and perfect your backyard oasis today.

A deck set up for dinner atop a deck board pattern made from angled deck boards

How to Install Decking on a 45 Degree Angle:

To start, you'll want to ensure that the deck frame is square and the joists are spaced properly to support the deck planks angled above them. Generally, builders will attach joists at 16 inches on-center, however, it's recommended to space your joists closer at 12 inches apart on-center when attaching your decking at an angle. Deck renovations on existing backyard spaces can simply have blocking added between the joists as needed.

Run your tape measure diagonally across your deck from corner to corner, find and note the length. For increased accuracy, feel free to set a chalk line along this span. This angle is the direction the installed deck boards will run and this measurement is the maximum board span you'll be installing. Center your longest deck board along that 45-degree angle as you will work from the center plank outwards. Starting the longest board in the center will reduce the number of butt joints necessary in your project.

Using the deck fastener of your choice, attach the first deck board to the deck joists at each intersection. With the first board attached, continue attaching boards in one direction away from the center until reaching one end of the deck. Then, repeat the process out from the other side of the initial board until reaching the opposite end of your deck.

Let the boards extend out over the rim joists of the deck, then cut the edges of the planks flush to the joists with a circular saw when all boards are attached. This will both save time in your overall installation process as well as produce cleaner edges. Complete your deck with a coordinating fascia board mounted along the outer perimeter for a polished final look.

Learn how to lay your composite deck boards at an angle to create unique deck board patterns and designs

Recommended Products:

CAMO Drive EdgeXClips are a brilliant choice for installing any grooved decking lumber at an angle. The CAMO EdgeXClip features a unique design with adjustable wings on either side, allowing you to install any angled decking pattern that your deck layout requires. Simply pinch together the wings on one side and slide them fully into the board's groove.

WiseGuides Deck Board Spacers by DeckWise allow you to create a consistent deck board gapping throughout your entire deck area easily. Simply set the spacer in place against an installed board, slide the next plank in place, and continue.

Angled Deck Board Photo Gallery

A long deck with deck boards installed at a 45 degree angle to the house
A deck with deck boards installed diagonally for a unique look
A large deck with several different sections using diagonal deck boards in an eye-catching pattern

More Deck Project Resources

Unify your outdoor space by matching your Barrette MVP Grooved Edge Deck Boards, shown in Brazilian Cherry, with your furniture.
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