I am doing decking in my garden, the beams will be 15' long, should i go for 4x8 (two 2x8's) or 4x10 (two 2x10's)
The joists need to be 17'. Should i go for 2x6 or 2x8??
2006-06-26 01:09:50 · 5 answers · asked by Anonymous in Home & Garden ➔ Garden & Landscape
It depends on your design criteria (strength and deflection). What are your predetermined live & dead loads (psf). What is your joist spacing going to be? You may want to be a little more spacific to get a little more information.
Mena
Architectural Building Technologist
2006-06-26 01:30:42 · answer #1 · answered by Amanda 4 · 0⤊ 0⤋
Assuming 30 psf of live load ( typical design for sleeping areas) with 24" spacing, the recommended floor joist is a 2 x 12 for a 17'5" span. This is a bit more of a load than you might see on a deck.
If you consider the beams to be similar to a header over a window opening, then the minimum would probably be two 2 x 12's. You are not holding up a second story or a roof but the deck boards and joists are still pretty heavy specially when they are wet.
I have seen several older decks that have significant sag over time just from the weight of the deck boards. I would suggest you not go less than 2 x 12's for the beams and 2 x 10's for the joists. Yes it will cost a bit more but in the long run you will be happier with the finished product.
2006-06-26 02:04:21 · answer #2 · answered by oil field trash 7 · 0⤊ 0⤋
I think 4x8 should be plenty strong enough,if it still feels a little spongy after you frame it,add a row or two of blocking to help stiffen it up.
2x8 for joists at least.
Good luck on your project.
Have a great day!
2006-06-26 01:29:05 · answer #3 · answered by Anonymous · 0⤊ 0⤋
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