Joists For Second Floor

Section r502 10 of the international residential code states that header joists can be the same size as the floor joists when the header joist span isn t greater than 4 feet but if the header joist span is more than 4 feet you ll need to double the header joist and ensure that it s capable of.

Joists for second floor.

Framers construct the second story floor system to match the layout of the main floor system. To be storage space for 2800 cb ft of house hold. A room used solely for sleeping might need to carry only 30 psf whereas a garage floor over a basement would need 50 psf or higher. This size is no longer acceptable when framing a structure.

In buildings with basements the first level of floor joists serves the same purpose. Second floor construction techniques follow a standard process. In the past 2x4s or 2x6s were sometimes used as floor joists. The floor joist spacing is the distance between the centers of any two installed joists.

Notches will compromise the strength of the new joists but some notches are acceptable depending on their location. Floor joists installed on second or third or higher levels double as ceiling joists for the level below. Maximum floor joist span for no. Then set new joists same height as existing ones alongside the old.

Additional support for the floor joists is achieved by nailing the ends of the joists into headers. 2 grade of douglas fir are indicated below. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. First floor live loads have higher requirements than second floor live loads 40 pounds per square foot vs.

When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. Tubs sinks showers or appliances. Tack a beam under the sagging joists. 1 psf lb f ft 2 47 88 n m 2.

Joist span and spacing is set by your local building code. 1 ft 0 3048 m. As well as human traffic. Live load is weight of furniture wind snow and more.

The walls are std concrete block. An inaccessible attic space on the other hand might have a live load of only 20 psf. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. Dead load weight of structure and fixed loads 10 lbs ft 2.

While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. I want this added floor space 2nd floor to support 23000 lbs of house hold furniture no water fixtures.