Table of Contents
Is blocking required for floor joists?
Blocking is not required for floor joists unless joists are greater than 12” in depth (according to IRC). Both ends should be blocked or affixed to rim joists/band joists. If so, then blocking is not required unless the ratio of the joist width to thickness is greater than 6:1.
What joist span requires blocking?
Is blocking required for floor joists? Building code requires the use of blocking for floor joists that exceed 2 inches in width by 12 inches in depth. Blocking also needs to be provided at the supporting end of a joist.
Do 2×8 joists need blocking?
An easy deterrent or fix is the use of deck joist blocking. Blocking, according to the building code, is required at the open end between joists to prevent rotation or at 8-foot maximums if the joists are greater than 2×12 in dimensions.
How far apart should blocking be?
Blocking must be equally spaced in rows, maximum of 4 to 6 feet apart. WHY IS BLOCKING NEEDED? Solid wood blocking will help reduce up or down movement and/or twisting of joists.
Where should deck joists be blocked?
Step 5: Install Your Blocking
- Space. Solid wood blocking should be equally spaced in rows, with a maximum of 4′ to 6′ apart.
- Place. Blocking should be installed edge to edge to allow for fastening of the interior blocking.
- Fasten. Use exterior-grade fasteners to fasten through the outside of the joist.
Is deck joist blocking required?
According to National Design Specifications (NDS) blocking is required on any deck joist over 8ft long on 2″x 10″ and 2″ x 12″ material. We would recommend blocking on any deck joists greater than 2″ x 6″.
How far apart should floor blocking be?
4 to 6 feet apart
Always make sure your joist, blocking and any added framing are even and in plane with each other across the tops. Blocking: should be installed edge to edge to allow for fastening of the interior blocking. Blocking required every 4′ – 6′. Blocking must be equally spaced in rows, maximum of 4 to 6 feet apart.