# What size lumber can span 13 feet?

## What size lumber can span 13 feet?

A 2×6 spaced 16 inches apart can span a maximum distance of 13 feet 5 inches when used as a rafter, 10 feet 9 inches when used as a joist, and 6 feet 11 inches when used as a deck beam to support joists with a 6-foot span. What is this?

**What size beam do I need to span 15 feet?**

For 15 foot span, size of continuous beam for 2-3 storey residential building, using thumb rule, is about 9″×9″ in which beam width is 9″ and beam depth is 9″ providing with 2nos of 10mm bar at top, 2nos of 12mm bar at bottom and 2nos of 12mm crank bar of Fe500 with stirrup T8@6″C/C and M20 grade of concrete ratio (1: …

**How do I calculate what size beam I need?**

Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting. Divide by the number of beams which will be installed to get the loading per beam.

### What size beam do I need for a 12 foot opening?

If the span of the beam is 12 feet, then the depth of the beam will be 12 inches, beam depth taken as 12″ and beam width 12/1.5=8, taking as 9″.

**Can a 2X8 span 16 feet?**

Span is determined by species, grade, dimensions, spacing, use, and load. 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. Based on all factors though, a 2×8 joist span is 7′-1” to 16′-6”, and a rafter 6′-7” and 23′-9”.

**How to calculate the beam span of a floor?**

Beam Span Calculator 1 Select the number of floors supported by the beam 2 Use Buttons Below to Select Supported Length of floor joists in feet (or metres in brackets) for the beam More

## How big should a floor joist beam be for a house?

So we now have adequately sized floor joists and an adequately sized floor joist beam for our 24′ X 13′ house. Our floor joist beam can span a maximum of 13′. In the table above, the widest floor beam span for 12′ of supported floor joists is 14’7″ (if using a 5-ply 2 X 12). What if we needed to span more than that?

**How many beam spans do you need for a 2×8 beam?**

These nine beam spans are for built-up beams made up of either 2X8, 2X10 or 2X12 dimensional lumber nailed together as either 3, 4, or 5 ply beams. For example a 3-ply 2X8 beam would use three 2X8s nailed together side by side.

**How big does a wood beam have to be?**

According to the 2012 IRC codes any beam, joist, or header shall never have a bearing of less than 1 1/2″. Anything 5′ and above we always at least double cripple.