Expert opinion wanted on 20'x14' deck

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Topic by JMG posted 07-03-2009 11:59 PM 6332 views 0 times favorited 5 replies Add to Favorites Watch
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4 posts in 5076 days

07-03-2009 11:59 PM

Topic tags/keywords: deck tips outdoor framing question

I am building a 20’x14’ deck on the back of a house. The deck will be about 9’-10’ off the ground and the homeowner dosen’t want any posts under the deck, only around the edge. I have decided to use 2”x12”x14’ for my joists on a 16” center. A drop sill under the joists is also not an option. Will my deck be bouncy, or will I end up with a solid structure?

-- Jon

View SteveB's profile


8 posts in 5193 days

07-04-2009 05:48 AM

This deck joist calculator: http://www.decks.com/Calculators/JoistSpan.aspx
says you can span up to 15’ 4” if you space your 2×12 joists every 24”. I think that will be a little bouncy, so I’d space the joists at 16”.

Does your location require a building permit for a deck? The permit application might require an engineering stamp. At the least, ask your friend the architect about a good spacing.

View RustyNail's profile


1 post in 5034 days

08-15-2009 01:31 AM

JMG, to attain a jiggle free deck I recommend installing a let-in brace on the underside at a 45* angle…

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09-25-2016 02:47 PM

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08-31-2017 07:48 AM

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09-08-2017 02:42 AM

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