2x4 Rafters To 2x8 Floor Joists

In this case the framer used 9 8d nails on each side of splice which is adequate in this case.

2x4 rafters to 2x8 floor joists.

When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. This a rough guideline. 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. A 9 2 2x4 2 2x6 2 2x6 2 2x6 2 2x8 2 2x10 2 2x10 2 2x12 2 2x12 n 10.

However when running spf 2 6 floor joists into the floor joist calculator referenced above you get a maximum span of 9 feet 8 inches with a minimum bearing length of 3 inches at each end on 12 centers. Most new construction uses 2 by 8 lumber for joists although 2 by 6. Hem fir 2 joists with a live dead load of 40 10 psf. The rule of thumb is 6 foot span with a 2 6 on 16 centers.

Also available for the android os. Span calculator for wood joists and rafters also available for the android os. Splitting the wood does no good. Sistering 2x6 joists next to your current 2x4 joists will simply give you a new floor height of 5 1 2 inches as opposed to the current 3 1 2 inches.

If you want to put down flooring in your attic and want more insulation underneath that floor then you need to increase your joist size. Get free shipping on qualified 2x4 joist hangers or buy online pick up in store today in the building materials department. The heavier the load the closer together the. In this case the framer just needed a longer rafter.

Joist span and spacing is set by your local building code. Floor beam table. Floor joist table joist size joist spacing maximum span 2 x 6. Pictured at left is a diagram of some recommend prescriptive repair techniques for floor joists.

Purchase the type of lumber that matches the width of the existing joist. Use your common sense when deciding how many fasteners are needed.