What size timber is used for floor joists?

What size timber is used for floor joists?

Solid strutting should be at least 38 mm thick timber extending to at least three quarters the joist depth e.g. 200 x 50mm joists would need at least 150 x 38mm timber used as strutting.

What size should floor joists be?

The spacing of floor joists is just one of the components used to determine the minimum size of the floor joist. Per the prescriptive tables found in Chapter 5 of the International Residential Code (IRC), the standard floor joist spacing used is 12, 16, 19.2, and 24 inches on center.

What do you need to know about floor joist span?

You need to measure the complete span of your floor joists, together with the distance between them (the ‘centres’) and the size of the timbers. This should be compared to the table.

What should the spacing be on a floor joist table?

The floor joist spacing is the distance between the centers of any two installed joists. See the image below for an example of joists spaced 16″ on center (16″ o.c.). 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.

What kind of lumber is used for floor joists?

Higher grades of lumber, however, are also much more expensive. Lumber graded as #2 is the most common choice for floor joists and other framing lumber. It has more knots and defects than higher grades, but usually not enough to cause significant loss of bending strength.

How big of a joist do I need for an 8 foot deck?

So, for an 8 foot long (2.44 m) deck, a Redwood joist of grade 2 lumber would need to be 2 x 6 (50.8 x 152.4 mm). A larger joist size would be perfectly acceptable, whereas a smaller size would not. The 2 x 6 joist size is suitable for most types of grade 2 lumber at 8 feet (2.44 m) in length. Is Amazon actually giving you the best price?