I Joist Size For Second Floor

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.

I joist size for second floor.

Joist spans 2 5m to 4 5m provide strutting at mid span. Joist span and spacing is set by your local building code. Below is a table giving the minimum size floor joists needed for 16 and 24 on center o c spacing when using 2 lumber with 10 pounds per square foot of dead load and 40 pounds of live load. You should check with your local building department for construction requirements in your area.

The 2 x 6 joist size is suitable for most types of grade 2 lumber at 8 feet 2 44 m in length. Solid timber strutting to be at least 38mm thick and be a minimum of three quarters of the joist depth. Size of joist. I joists are the most common way to structurally frame an upper floor in a residential building.

Joist spans up to 2 5m no strutting required. You can always use bigger lumber closer spacing or a smaller span. Just don t go smaller further apart or a longer span. Looking at this table you will see there is a choice in the size of floor joist 2 x 6 2 x 8 2 x 10 or 2 x 12 and there is a choice in the joist spacing 12 16 or 14.

Builders can adjust their choice of lumber size and spacing depending on circumstances. It is going to have a gambrel roof and a 2nd floor for storage. Joist spans over 4 5m provide 2 rows of strutting at third span positions. I have been at this for over 3 years and have learned a lot.

But i wanted to build it a little hardier so i bought 2x8x16. 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 joists are also commonly used in flat roofs for both residential and commercial buildings. At donaldson timber engineering we design and cut all of our i joist flooring systems using metsawood s finnjoists.

Floor joists suitable for domestic floor loadings. 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. I am building a shop shed barn all in one. 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.

A larger joist size would be perfectly acceptable whereas a smaller size would not. The plans i purchased said to use 2x6 for my 16 foot joist span.