20x20 groundlevel deck?

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Old 06-28-06, 05:02 PM
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20x20 groundlevel deck?

Hi, I plan on building a 20x20 deck as close to the ground as possible. I am using pt 4x6 beams and pt 2x8 12"oc and trex decking. My question is can I span 9' between the 4x6 beams to support the 2x8 joists?I plan on pouring footings 4 feet deep and every 6 feet.
 
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Old 06-28-06, 06:02 PM
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You can safely span 9' plus, with a 2x8. Can I ask why 12"oc, rather than 16"oc? The 16"oc will be adequate, and will save you a wad of money.
 
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Old 06-28-06, 07:20 PM
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Larry is right. I dont want to but in but I just finished my deck and was looking at the spans. You can go up to 13 f. 8 in. with 12 in. oc.

Good luck and make it a fun project!
 
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Old 06-29-06, 04:21 AM
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20x20 deck

I am going to go 12"oc because I was told that trex can become bouncy and sometimes sag at 16"oc. Has antone else heard this?
 
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Old 06-30-06, 08:34 PM
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I've have never had a complain from a customer about their being "bouncy" or sagging when I set my joists at 16" O.c. for Trex or any other composite.

Since you want you deck "as close to the ground as possible", why noy use 2X6's for the joists? That would get you 2" closer. 90% of the decks that I build are done with 2X6 joists, with the girders (4X6's) set no more than 6' apart.

With 48" deep footings, frost must be an issue. I would dig the holes 48" deep (16" sq.), fill the bottom 12" with concrete and then sonotube up to a point 6" above grade. Set a Simpson PBS44 or similar in the top of the wet concrete. Backfill around the sonotube as you add the concrete in it.
 
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Old 07-01-06, 05:49 AM
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Lefty

Thanks for your help. If I use 2x6 joists can I overhang the ends of the joists 2 feet beyond the end girders? If I can overhang the girders 2 feet how many girders would I need if I use 2x6 joists? Also how many footings would I need per 4x6 girder if I use 10 foot girders placed on a footing at 10 feet?


Thanks for your help
 
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