Roof Joist And Ceiling Joist

According to the international residential code irc from 2000 one of three methods may be used to maintain a continuous tie support strength across the rafters supporting the roof weight and outward pressure.

Roof joist and ceiling joist.

A ceiling joist is a horizontal member that spans across your ceiling used in framing to span an open space. They are nominally 2 inches thick actual width usually 1 1 2 inches and come in a variety of widths from 8 to 12 inches. Oncenter bli 40 wood i joist 11 875 in x 2 5 in x 40 ft. This structural support comes in the form of roofing joists ceiling joists rafters or trusses and can be made from a variety of materials including wood metal reinforced concrete etc.

However in canada the most common material used in residential framing is wood so that is the material we will discuss here. Joists are the parallel horizontal beams that run across an open space joining opposite walls in a building to support both the ceiling below and the floor above. Ceiling joists are horizontal members used with rafters and roof joists. Obviously this saves the extra labor and expense of erecting each rafter and joist individually.

Their functions are similar to rafters. Joists are traditionally made from timber. Roof trusses are triangular forms used in construction of sloped roofs and basically consist of rafters and ceiling joists pre constructed as a unit. Nonparallel ceiling joist designs require additional support construction in the ceiling.

These run between beams and transfer the load from your roof to the vertical members or studs. Roof joists may span continuously from one side of the house to another or may be supported on an interior bearing wall. Other materials such as metal and concrete may also be involved in making a ceiling. They may carry ceiling loads.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Roof joists are found on low slope roofs slope of 2 in 12 or less. What are ceiling joists and beams. The triangular shape of the truss has long been proven the strongest roofing configuration as far as structural load bearing capability is concerned.