How far can you span a 2×8 with no support?

A rule of thumb is 1.5 times a joist’s depth but in feet when spaced at 16” centers. In general, a 2×8 will span 1.5 x 8, so 12-feet.

How long can a beam span without support?

A 2×10 beam – made up of two 2x10s nailed together – can span up to 11′ without support beneath a deck that is 4′ wide. For a more normal-sized deck, the same beam can span 8′, supporting a deck that is 8′ wide. You can also triple a 2×10 beam.

How big of a beam do I need to span 20 feet?

Wood beam size for a 20 foot span:- as per general thumb rule, for a 20 foot span, size of wood beam or lumber joist should be 2×14 which placed at 16″ apart from centre used for residential building or projects or construction in which depth of section of beam is 350mm (14″) and width of beam is 50 mm or 2″.

How far can a 2×8 roof beam span?

Max. Live Load 60 lbs/ft2 (2873 N/m2)
Maximum Span (ft – in)
Nominal Size (inches)Joist Spacing Center to Center, OC (inches)Lumber Grade
2 x 81212′ – 3”

How much load can a 2×8 support?

The weight that can be supported by a double or triple wood header
Span (feet)Weight Supported (lb)
2 x 2″ x 6″2 x 2″ x 8″

How far will a triple 2×8 span?

Dimensional Lumber Deck Beam Span Chart
Joist Spans
Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine3-2X67′-1″

Can I use 2×8 for deck joists?

2×8 for joists will be fine, with 16″ OC. Should use 2×10 for beams but 2×8 will be fine as well. If you are worried you can triple the 2×8 for the beams but double will be sufficient. You should put the beams at 7 and 14 feet out from the house, with the piers you should do 3 per beam with spacing of 1, 7, 13.

Can 2×8 be used for floor joist?

The rule of thumb is 1″ of depth for each foot of run. EX an 8′ span should have a 2×8 joist. The same rule of thumb applies to door and window headers but you should use 4x wood.

How big of a beam do I need to span 16 feet?

Wood beam size for a 16 foot span:- as per general thumb rule, for a 16 foot span, size of wood beam or lumber joist should be 2×10 which placed at 16″ apart from centre used for residential building or projects or construction in which depth of section of beam is 250mm (10″) and width of beam is 50 mm or 2″.

Should deck joists be 2×6 or 2×8?

For upper-level decks, 2×10 is recommended as the minimum size to use for strong guard post connections. 2×6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. … Most decking is not strong enough to support longer spans than 16″.

Can I use 2×8 for deck boards?

Q: Can I use 2×8 treated lumber as deck boards? A: No, that’s a not a good idea. Lumber wider than 6 inches should not be used as a flat surface. Wide, flat boards have a tendency to pool rain water, which can lead to cupping problems.

Can I use 2×8 for ledger board?

The best and easiest option is to mount a 2×8 directly to the existing 2×6 ledger board with 3 m10 or m12 3″ screws top/middle/bottom every 16″ on center. This is a common construction practice which I have detailed many times (I work at an architectural/structural firm).

How far apart should deck beams be?

Deck joists are typically spaced either every 12 inches or 16 inches on center. The maximum joist spacing you can use will depend on the size and allowable span of your joists.

What size beam do I need for a 12 foot span?

A double ply beam can span in feet if there is no overhang beyond it. A double 2×12 beam can span 12 feet, a double 2×10 can span 10 feet, and so on.

Should ledger board be bigger than joists?

How to choose the size of the deck ledger board. As a general rule, you should use the same size of board for the ledger as you plan to use for the joists. You can use a larger board, however, if it allows for a better connection to the house framing.

What kind of wood is used for ledger boards?

Treated lumber is typically the material of choice, since the deck ledger is exposed to the elements.

Can a ledger board be two pieces?

The ledger board doesn’t have to be one continuous board. It can be a series of broken sections if it is solidly attached. This will require extra bolts and installing a 2x nailer across the top of the vent to secure the decking along the house wall.

How thick should ledger board be?

The decking is 1-inch thick, so the top of the ledger is 1 1/8 inch below the bottom of the sill.

How long can a ledger board be?

If possible, you will want to have the ledger be one long piece of stock. However, if the length is over 16′ – 18′, it may be hard to find a straight piece that long. In this case, two pieces will work. Always try to use pieces that are at least 6′ – 8′ long.

How do you attach a ledger board to wood framing?

How far apart should ledger bolts be?

Typically, you will need to install your bolts alternating high and low 2″ from the top and bottom of the ledger board. As a rule of thumb, bolts can be spaced 16″ on center for supporting joist span up to 12′ in length. Longer joists will require tighter bolting patterns.

How much weight can a ledger board hold?

The ledger is 10′ long so every foot of ledger must be designed to carry at least 200 lbs of load.

Can you attach a beam to a ledger board?

From a more general engineering standpoint, the main concern with attaching a beam or girder to a ledger or a rim joist is the potential for lateral torsional buckling. This is where a long, slender beam with little to no lateral support twists under load, sometimes under its own weight.

How far can deck joists span?

Decking boards span from joist to joist. If you use 5/4 decking, joists must be no farther apart than 16 inches. Decking made of 2x4s or 2x6s can span up to 24 inches. If you will run decking at an angle, you might need to put the joists closer together.