Bundle of lumber wrapped in pink Owens Corning plastic that reads “How We Build Now,” loaded on a flatbed truck in a yard, with a forklift in the background under a blue sky.

How to Structure Your Deck with Owens Corning Structural Lumber

How To Frame A Deck

A solid frame is the backbone of any great deck, and this project walks through how to build one using Owens Corning Structural Lumber. Here’s the quick, streamlined breakdown.

 

1. Set Your Support Posts Correctly

The build starts with cutting and installing the support posts — the key to keeping the decknsquare and stable.

Highlights:

  • Posts are set about 4 feet deep
  • A string line keeps everything aligned
  • Posts are leveled and compacted with sand (or water if soil is dense)

Once the four corners are in, the remaining posts are filled in across the layout.

Wood deck frame under construction beside a pond, with exposed joists, tall posts, and the sun shining over houses and a grassy lawn in the background.

2. Transfer Elevation & Install Crossbucks

After the posts are set, the team transfers the deck’s elevation from the house to each post. This ensures the entire frame sits level.

They then install double crossbuck beams, which carry the structural load. These beams are fully bolted and later tied together with hurricane straps.

3. Add the Perimeter Cap Board

Instead of a ledger board, this design uses a cap board.

Why it matters:

  • It doesn’t carry weight — the crossbucks do
  • It locks the ends of the joists
  • It helps mark 16-inch on-center spacing for the stringers

The cap board also creates a clean line where the deck meets the house.

Close-up of a weathered wood deck, where a deck board has a chipped, splintered end over a joist held with metal screws, with green plants and a planter below.


4. Install the Stringers (Joists)

With the cap board in place, the team lays out and installs the stringers.

Process:

  • Measure 16 inches on center
  • Mark the cap board
  • Slide each stringer into place
  • Toenail it in with stainless screws

Owens Corning structural lumber stays consistent in size, so the team doesn’t need to shim or notch a major advantage over wood.

5. No Joist Hangers Needed

Because the joists rest directly on the 4x8 crossbucks and only cantilever about 8 inches toward the house, joist hangers aren’t required. Hurricane straps provide the necessary uplift and lateral resistance.

6. Install Blocker Boards for Breaker Boards

The deck is 33 feet wide, so the team adds three breaker boards for both structure and design. To support them, they install blocker boards between the joists.

Each block:

  • Is installed 16 inches on center
  • Sits flush with the joist height
  • Gets three screws per side

 

Underside of a wood-framed structure showing roof rafters connected to a large beam with metal hangers, straps, and nailing plates.

 

7. Add Hurricane Straps

Every joist-to-beam connection gets a stainless steel hurricane strap.

Inspectors require:

  • A strap at every connection
  • A nail in every hole

These straps lock the frame together and prevent movement.

8. Final Prep Before Decking

Before installing deck boards, the team:

  • Finds the exact center of the deck
  • Confirms breaker board alignment
  • Squares the frame using corner measurements
  • Snaps a string line across the joists

From there, decking begins at the house and works outward.

Final Takeaway

This project shows how Owens Corning structural lumber streamlines deck framing — fewer adjustments, cleaner lines, and a stronger, more consistent frame. With the posts, crossbucks, cap board, joists, blocks, and straps installed, the deck is ready for decking.

 

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