Joist Installation and Subfloor

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What happens here

Floor joists or I-joists are then installed, spanning from the exterior foundation to the interior beam. These joists are the horizontal members that form the floor frame and support the subfloor. They are typically face-nailed from the outside into the band joist and toe-nailed from the inside. After the joists are in place, the subfloor is installed. The subfloor consists of 4x8 sheets of 23/32 inch (or 3/4 inch or thicker) OSB (oriented strand board) or plywood. The seams of the subfloor sheets are staggered over the joists to enhance structural integrity.

Goal: Construct the floor system by installing joists and applying the subfloor.

Tools and materials

Joist / I-Joist Models N/A — Representing the horizontal floor framing members
Pointer Stick N/A — Highlighting different components of the model
Subfloor Sheets — Representing OSB or plywood subfloor panels

What they say

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This sits on your J-bolts and gets tightened down. Then your band joist. This typically gets toe-nailed in place. Now your joists get installed. These get face-nailed from the outside and toe-nailed on the inside. This spans from exterior foundation to interior beam. Now your subfloor gets installed. It's 4x8 sheets. Stagger your seams on the joists and use 3/4 or bigger material. Now your walls will get framed with a single bottom plate and a double top plate. It's common to install your OSB or plywood first and use be 7/16 or

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