Deck framing

Old 06-17-06, 01:03 PM
Thread Starter
Join Date: Feb 2006
Location: USA
Posts: 6,371
Received 61 Upvotes on 53 Posts
Question Deck framing

What is the recommended lumber size for framing a 12' x 20' deck? The joists will span the 12' dimension. Will use five posts on each side and five posts through the center for support.
I was thinking of using 2x8's. Would this be sufficient?
Old 06-17-06, 01:35 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
2x8's can generally span upwards to 12'10" plus depending on the grade. I would use no less than grade 2 lumber. Also, you will want the span to be no more than 16"oc
Old 06-17-06, 10:32 PM
Join Date: Mar 2000
Location: Arlington, WA
Posts: 8,670
Upvotes: 0
Received 1 Upvote on 1 Post
At 12 X 20, I would probably run the beams and the deck boards in the 20 foot direction and the joists in the 12' direction. I would use 3 beams (or girders), and the joists would span 5' to 6' depending on whether it was cantilevered or not. 2X6's at 16" O. C. will span 6' are are MUCH easier to find (plus they cost less) than 2X8's.

What size of beams you use will determine how far you will space the footings. I almost always use 4X6's and space the footing 5' to 6' apart.

How far above grade is the deck at it's highest point? Around here, if it's more than 30", it requires a bldg. permit and you build it the way the approved plans call for.

Thread Tools
Search this Thread
Ask a Question
Question Title: