Question: How far can a 2×8 rafter 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 8 12 12′ – 3”
16 11′
24 9′
  • The distance 2×8 rafters can span depends on the species, grade, spacing, and loads. Rafters, unlike joists, are sloped and experience loads and forces differently than joists or beams. A look at a rafter span table shows the allowable spans are between 6’-7” and 23’-9”, depending on the factors and loads.

How far can a 2×8 Rafter span without support?

Also, how far can a 2×8 span without support? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. The larger the deck, the larger the joists.

How far can a rafter span without support?

The table states that 2 X 6 rafters spaced 16 inches on center (o.c) can span a maximum distance of 13 feet 5 inches. Another option are 2 X 8 rafters spaced 24 inches o.c.

How far can I span a 2X6 Rafter?

2-grade 2×6 joists can span up to 10 feet 9 inches from beam to beam when spaced the standard 16 inches apart with a maximum live load of 30 inches per square foot. In comparison, No. -1 grade lumber can span slightly further to 10 feet 11 inches under the same parameters.

How far can 3 2×8 header span?

Joist Spans
Southern Pine 32X8 10′-7″
3-2X10 12′-9″
3-2X12 15′-0″
Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine 3X6 OR 2-2X6 5′-2″
You might be interested:  Readers ask: How much can a pallet jack lift?

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

For a 20 foot span, wood beam needs to be minimum 18 inches deep. We ended up lifting that heavy ass beam by by hand. This was about a twenty foot span, set the beam on 4″ round steel columns on 12×12 by 1/2 inch plate on block. So, if your span is 30 feet (or 360 inches) you would divide that by 20 to come to 18 feet.

What size beam is needed to span 22 feet?

Use one 22′ long W8x48 steel beam down the center of your 22’x28′ rectangle. This steel beam is 8.5″ deep, plus a 1.5″ deep wood nailer plate, plus 0.75″ floor sheathing, means that the floor is 10.75″ at the deepest point. Then use 2×10 joists spaced at 16″ on center spanning 14′ on each side of the steel beam.

How far can a 2×12 span without support?

How do I keep them even? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet.

How far can a triple 2×12 beam span?

of 14 feet for a triple 2×12.

How far can a 2×4 Rafter span without support?

Spacing your 2×4 shed rafters at 24” on center limits the width of your roof. For light load roofs, 24” o.c. 2×4 rafters can span up to 7 ⅔’. For heavy loads, 2x4s can span up to 5 ½’.

How far can a 2×6 span for a metal roof?

Max. Live Load 20 lbs/ft2 (956 N/m2)

You might be interested:  What Is The Green Transformers Name In Age Of Extinction?
Maximum Span (ft – in)
Nominal Size (inches) Rafter Spacing, Center to Center, OC (inches) Lumber Grade
2 x 6 12 16′ – 4”
16 14′ – 11”
24 13′

How far can you cantilever a 2×6 roof?

Looking at the table below, we see that 2×6 floor joists can be cantilevered up to 2 feet and 6 inches (2′-6″) when the joists are spaced 16″ apart.

How far can a 2×6 beam span without support?

How far can a 2×6 Rafter span without support? The table states that 2 X 6 rafters spaced 16 inches on center (o.c) can span a maximum distance of 13 feet 5 inches.

How far can a 6×6 beam span without support?

Each 6×6 beam only spans 12 feet, of which 2 of those feet are supported by a knee brace. So technically the beams only span 10ft.

What is the maximum span for a 2×8 header?

Figure B: Example of Calculating Header Size

Header Size Maximum Span Number of Trimmers
Double 2×6 4 ft., 0 in. One
Double 2×8 5 ft., 0 in. Two
Double 2×10 6 ft., 2 in. Two
Double 2×12 7 ft., 1 in. Two

Leave a Reply

Your email address will not be published. Required fields are marked *