Does every joist need a deck block?

Author: Ahmed Nikolaus  |  Last update: Friday, April 10, 2026

It depends on which type of lumber you're using. Most lumber manufacturers recommend that the blocking between the floor joists be placed every 2 feet. For example, if your deck has 8-foot-long joists, you will want to add a piece of blocking every 2 feet: at 6 feet and 10 feet.

Is blocking required for deck joists?

According to the(IRC), which guides most local building regulations, blocking is mandatory in specific instances, such as where deck joists are not attached to a ledger board against a house.

Are deck blocks necessary?

They are considered a more stable and safe option for a deck foundation and are suitable for decks that have many levels, heavy loads, or are attached to the house. They are also used for decks that will be built in areas with heavy snow or high winds, as they provide a stronger foundation to withstand the weather.

Do I joists require blocking?

I-Joists must be supported laterally at all bearings and the ends of cantilevers. Unless specified, bridging or mid-span blocking is not required; however, it may enhance floor performance if used properly.

Do 2x8 joists need blocking?

On BestDeckSite, we recommend installing blocking on 2x8 joists too. Here's a word of caution. As you get on a roll calling out numbers for the guy at the saw while hammering in the preceding block, make sure not to throw off the joist spacing.

Deck Joist Blocking? What is it? Why do we need it?

What size floor joists need blocking?

Blocking shall consist of C-shaped or track section with a minimum thickness of 33 mils (0.84 mm). Blocking shall be fastened to each adjacent joist through a 33-mil (0.84 mm) clip angle, bent web of blocking or flanges of web stiffeners with two No. 8 screws on each side.

What is the code for deck blocking?

R507. 6.2 Deck Joist Lateral Restraint. Joist ends and bearing locations shall be provided with lateral resistance to prevent rotation. Where lateral restraint is provided by joist hangers or blocking between joists, their depth shall equal not less than 60 percent of the joist depth.

What is code for blocking on floor joists?

Joists exceeding a nominal 2 inches by 12 inches (51 mm by 305 mm) shall be supported laterally by solid blocking, diagonal bridging (wood or metal), or a continuous 1-inch by 3-inch (25 mm by 76 mm) strip nailed across the bottom of joists perpendicular to joists at intervals not exceeding 8 feet (2438 mm).

Is blocking necessary in framing?

So, when your home construction project is in the framing stage it's crucial that your contractor doesn't cut corners. Installation of blocking in every room, exterior and interior of the house will need to be done.

What is the rule for joists?

Is there a simple way to size floor joists? A. Carl Hagstrom responds: The rule of thumb that I like to use when sizing uniformly loaded residential floor joists is "half the span plus two." First, round the clear span of the floor joist up to the nearest foot, and divide by two. Then add two to the answer.

Are deck blocks up to code?

Concrete footings and deck blocks are subjected to all of the same regulations as a normal footing, whether or not they are cast-in-place.

Should I put gravel under deck blocks?

Yes. Gravel helps support the weight of the deck and prevents shifting or sinking into the ground. It also allows for drainage, which can help prevent rot in wood decks caused by standing water.

When should you deck a block?

The deck of the block should be perpendicular to the crankshaft center line. A block is also decked to ensure a good, flat surface in order to achieve a good gasket seal. Engine blocks are also decked to create proper deck height. Deck height is the distance between the crank center line to the deck surface.

Do you need deck blocks?

Deck blocks offer advantages like cost-effectiveness and flexibility but also have disadvantages like instability and a lack of long-term durability. To ensure you pick the right foundation option and can fully enjoy your outdoor living space, partner with reliable deck companies near Twin Cities like UglyDeck.

Can you use 2x6 for deck blocking?

It's generally recommended that 2x6 or thicker be used for a sturdy deck.

Do you nail or screw deck joist blocking?

Nail or Screw Deck Blocking? 10d nails are commonly used to fasten deck blocking. Nails have greater strength, while screws have a greater pulling and holding ability. Professional builders use special screws to pull twisted joists against the blocks and prevent squeaks.

Is joist blocking necessary?

WHY IS BLOCKING NEEDED? Solid wood blocking will help reduce up or down movement and/or twisting of joists. Limiting joist movement can help reduce excessive gapping and also ensure a more uniform finished surface of your TimberTech Deck.

Is blocking always necessary?

Blocking is a simple but vital step which will greatly improve the look of even the most beginner knitting. If you have made the effort to hand-knit something, it deserves to be blocked.

What are the rules for blocking?

Section 69A of the IT (Amendment) Act, 2008, allows the Central Government to block content where it believes that this content threatens the security of the State; the sovereignty, integrity or defence of India; friendly relations with foreign States; public order; or to prevent incitement for the commission of a ...

What is the blocking between floor joists called?

This may take the form of diagonal cross bracing, or herringbone, bracing between floor joists. When solid blocks are used instead of diagonals it is called bridging, block bridging, solid bridging or solid strutting.

Do ceiling joists require blocking?

Rafters and ceiling joists having a depth-to-thickness ratio exceeding 6 to 1 based on nominal dimensions shall be supported laterally by solid blocking, diagonal bridging (wood or metal) or a continuous 1-inch by 3-inch (25 mm by 76 mm) wood strip nailed across the rafters or ceiling joists at intervals not exceeding ...

How should floor joists be supported?

Generally, making a supporting mid-span beam or wall beneath the floor joists is the best technique to reinforce them. Continue reading to find out about when you should reinforce your floor joists, causes of bouncy flooring, how to check a bouncy floor, and the best ways to strengthen your floor joists.

How far can a 2x8 span without support?

2x4 11'-6" 2x6 17'-0" 2x8 21'-8" 2x10 25'-7" 24" O.C.

Where do you put deck blocks?

Simply placing them on the ground or on a poured concrete pad a few inches deep usually isn't enough to comply with codes — they must be set at least 12 inches deep in undisturbed soil. However, concrete deck blocks can be used without restriction for a freestanding deck that's not attached to your house.

What is the difference between deck block and Tuffblock?

TuffBlocks have been engineered to be stackable and only weigh 1.5lbs (680g) each, compared to that of a traditional concrete deck block that weighs 41.5lb (18kg) each!

Previous article
Why is there still dust after vacuuming?
Next article
What smells does vinegar get rid of?