What is the maximum span of an I joist?

Span refers to the length of the I-joist. The L/480 table with a 40 per square foot live load and a 20 per square foot dead load with a depth of 11 7/8 inches will give you spans according to joint weight. With these factors, the lightest joist will have a maximum span of 17 feet, 8 inches.

What are engineered floor joists?

Engineered floor joists are joists that use engineered wood in conjunction with standard lumber to comprise a more lightweight yet stronger joist than just using traditional lumber. It is important to note that engineered joists come in several types, from the popular I-beam type to truss-style joists.

How wide are floor joists UK?

As a general rule – floorboards should be a minimum 16mm thick for joist centres up to 500mm and 19mm minimum for centres up to 600mm.

What is a floor joist in construction?

Floor joists are horizontal structural members that span an open space, often between beams, which subsequently transfer the load to vertical structural members. These joists, part of the floor system, carry the weight of everything inside a room, including walls, furniture, appliances, and even people.

Are engineered joists stronger?

Engineered joists that are strong and use less lumber than solid wood joists. Wooden i-joists are often made with two solid lumber pieces along each edge, joined together with a sheet of plywood, oriented strand board (OSB), or metal triangles to keep the edge pieces apart and provide bending strength.

What size timber do I need for a flat roof?

The sizing and spacing will depend upon the loads imposed on them and the required span. Wherever possible, joists should span the shortest distance. Common joists sizes are 200 x 50mm, 175 x 50mm, and 150 x 50mm. The joists will normally be placed at 400mm centres but no more than 600mm centres.

How far apart are joists in a ceiling UK?

16 to 24 inches
Just like the studs, the standard spacing between joists is 16 to 24 inches.

How far can an engineered joist span?

Joists are available in several depths and lengths and superior strength allows them to span up to 30 feet (TRIFORCE span tables).

How far can 4×2 joist span?

A 2×4 can span a maximum of 6′ 7” when spaced 16” apart and used as a floor or deck joist. When used as a ceiling joist or a roof rafter, a 2×4 can span up to 7′ 3” spaced at 16”, and 6′ 4” when spaced 24” apart. Due to the small spans of 2x4s, they often are not used in horizontal load-bearing capacities.