# Floor joists in residential construction size

## What size should floor joists be?

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 many floor joists do I need calculator?

The basic math is to divide the width by the on center spacing, round up to the nearest integer and then add one for the first joist (at the zero position). The length is used for the length of the joists or I- joists .

## How far can a 2×6 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 .

## Are two 2×6 stronger than a 2×8?

Similarly, are two 2×6 stronger than a 2×8 ? In bending, a joist composed of two 2×6’s (true dimension 1.5 inches x 5.5 inches) are slightly stronger than a single 2×8 true dimensions 1.5 inches by 7.25 inches.

## What is the maximum span for a 2×6 floor joist?

Max. Live Load 30 lbs/ft2 (1436 N/m2)

Maximum Span (ft – in) | ||
---|---|---|

Nominal Size (inches) | Joist Spacing Center to Center (inches) | Lumber Grade |

2 x 6 | 24 | 9′ – 7″ |

2 x 8 | 12 | 15′ – 10″ |

16 | 14′ – 5″ |

## How do you calculate floor joist spacing?

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.

## How many screws are in a 4×8 sheet of subfloor?

28 screws

## Can I use 2×4 for floor joists?

for a real house no you cannot, 2×4 will not have the structural strength to support a load as a floor house in a house. And if your building a home or adding a addition with 2×4 if it doesn’t fall apart if you have a inspection it will fail inspections. 2×4 are for framing walls not for floor joists .

## How far can a double 2×6 header span?

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 |

## What is the longest 2×6?

2-in x 6-in x 24-ft Southern Yellow Pine Lumber Common: 2-in x 6-in x 24-ft; Actual: 1.5-in x 5.5-in x 24-ft. Recommended for most general construction projects including framing, houses, barns, sheds, furniture and hobbies. Virtually no wane for better appearance than standard lumber.

## How much weight can a 2×6 hold on edge?

For example, a 2×4 lumber may hold a 4-cylinder engine comfortably but may not hold a bigger one. On the other end, a 2×6 can support a V8 engine of between 600 – 700 lbs . What is the load capacity of a 2×6 ?

Joist Spacing (o.c.) | 12″ | |
---|---|---|

Species | Size | Allowable Span |

Southern Pine | 2×6 | 9′-11″ |

2×8 | 13′-1″ | |

2×10 | 16′-2″ |

## How much weight can 2 2×8 floor joists hold?

2,200 lbs. In this manner, how much weight can a 2×8 joist hold? some of it gets pretty technical in nature, and mostly relates to pounds / square foot of loading. 2x6s are generally used for ceiling joists, esp since you said 24″ oc and reallllly short spans only (5 or 6 feet ).

## How much weight can a double 2×6 hold?

So the area between two 2×6, 6′ long, on 2′ intervals would have to be able to support 2x6x40= 480 pounds of weight. Actually, slightly more since the formula is for 8′-6″ spans but it just gives you a little bit of extra load for just in case.

## What is the load bearing capacity of a wood 2×6?

Engineer 10 adds that a No. 2 2×6 over a 16-ft. span can carry 10 psf while a 2×8 will carry 20 psf. Sistering the two together means a load – carrying capacity of 30 psf.