Floor Joist Dead Load

Joists and rafters must be strong enough not to break when loaded.

Floor joist dead load.

Unlike stiffness live loads and dead loads are added together to determine minimum design values for strength. Span calculator for wood joists and rafters available for the iphone. 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. 1 ft 0 3048 m.

Live load is weight of furniture wind snow and more. In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. Dead load of first floor ceiling not plastered 10 lbs. In this case your joists are adequate to support a 30 psf live load and 10 psf dead load.

Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Unlike stiffness live loads and dead loads are added together to determine minimum design values for strength. Span calculator for wood joists and rafters also available for the android os. Floor joist span tables for various sizes and species of wood.

The joists must be able to support this dead load without sagging. To determine the dead load value for a given floor or roof system the weight of all permanently installed materials in a given component are added together. Of floor area dead load of partitions 20 lbs. Of floor area dead load on second floor 20 lbs.

Dead load psf exterior exposure. Dead load weight of structure and fixed loads 10 lbs ft 2. 1 psf lb f ft 2 47 88 n m 2. Kn sq m the weight we place upon a floor by way of bathroom suites beds wardrobes etc is known as the imposed load.

The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000. Identify the live and dead load condition. To determine the dead load value for a given floor or roof system the weight of all permanently installed materials in a given component are added together. This dead load is generally taken by architects and planners to be no more than 0 50 kilo newtons per square metre.

Joists and rafters must be strong enough not to break when loaded. 2 grade of douglas fir are indicated below. Select on center spacing. Dead load of attic floor when floored 20 lbs.

Determine the appropriate live load deflection criteria.