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# double 2x12 floor joist span

### How far can a 2x8 floor joist span? - Quora

A 2x8 joist was not used for floor framing during my public experience as a builder 2x10 was the minimum width for floor joist in house construction and the common length was 16ft per 24ft span.

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### How Far Can You Span a 2X10 Floor Joist? | Hunker

Joists that are closer together can support more weight which allows the joists to span a longer distance than joists spaced further apart. The maximum span distance for 12-inch spacing is greater by as much as 30 percent compared to 24-inch spacing. Spacing is measured from the center of one joist to the center of the next.

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### 20 foot span with triple 2x12 beam possible or rediculous ...

And replace with a 2x12 beam. The length of the span is approximately 20 feet I have four 24' 2 x 12's. The room is 20' wide from outside wall to outside wall.underneath is a basement with a beam directly below the wall in question the beam is a 6x6 timber supported every 8' by 6x6 timber columns.

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### Doubling up floor joists - Google Groups

Planning to span a 19-foot unsupported section in one leap here. Span tables say that 2x12 #2 dougfir joists will do it if placed 16" OC. Clearance mandates something less tall than 2x12. Hmmmm can I double up on smaller joists? Check my math here: Bending strength increases linearly with width and as the square of depth.

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### FLOOR JOIST TABLE

Spans in this table were derived from the IRC Table R502.3.1(2) Design Criteria: Hem–Fir # 2 joists with a live/dead load of 40/10 psf. DOL 1.00; L / 360. FLOOR BEAM TABLE

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### Span Tables - Southern Pine

Joists & Rafters Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

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### Floor Joist Span Tables—Calculator

Looking at this table you will see there is a choice in the size of floor joist (2 X 6 2 X 8 2 X 10 or 2 X 12) and there is a choice in the joist spacing (12" 16" or 14"). The floor joist spacing is the distance between the centers of any two installed joists. See the image below for an example of joists spaced 16" on center (16" o.c.).

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### Understanding Floor Joist Spans - The Spruce

True floor joist span calculations can only be made by a structural engineer or contractor. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on-center (o.c.) for 2-grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction:

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### ceiling - Can I span 23 feet with doubled 2x8 floor joists ...

Way back then the wood was milled to 1 5/8" wide to 7 5/8" high. You say there is a wall "mid-way". Therefore the span is 12'. So with joists at 16" on center they will support about 78 lbs. per square foot. (This is based on a No.2 grade Douglas Fir-Larch wood joist. Douglas Fir-Larch lumber is some of the strongest.

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### Beam Span Chart Table | Decks.com

When supporting joists that span 12 feet with no overhang beyond the beam a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on. Dimensional Lumber Deck Beam Span Chart . The numbers in gray indicate the distance between the support posts.

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