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Old 07-18-2011, 12:07 PM   #1
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Question on enlarging existing deck

I have a 14'x12' deck attached to my house, built within the last 10 years.
We would like to expand it to 16'wx about 20'deep, then put another level one step down from that out to our above ground pool.

I have 2 questions- first, I'm assuming it's probably not a good idea to just extend the ledger board by a foot on each side of the deck- is there another solution without completely removing the existing framing? We have 2 sets of -2-2x12 beams resting on 4x6 posts which are on 10" concrete footings. All built well beyond code recommendations. I checked local codes, and the footings, joist span and beam span will all be ok.

2nd, can I just attach 2x8 joists to the existing end joist to extend the depth to 20'? We have 3 footings poured within a foot of the proposed end of the deck, and I plan on using the double 2x12's for this beam also. I figured with the 2x8's, I can run the next level out to the pool under this level, and the 2x8 would give me a 7 1/4" step down to that final level. Any help would be appreciated!



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Old 07-18-2011, 12:55 PM   #2
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Draw up what you "want to do" and take it to your building permit deparment. They will look it over and tell you what needs to be done to pass code in your city.

When I built my deck last year, due to a canteliver on the house, one side of my deck only had a 16" ledger on one side of the cantilever. In order for it to be alright, I had to put a pile/footing with a post under it, and the pile had to go down 12 feet.

I imagine you can extend your joists with additional 2x's, as long as the new ones overlap the end beam you have the original joists sitting on, so the additional joists are supported on the joint by the beam. But your permit office will be able to help you better.

Good luck. Keep us posted on progress!


Last edited by dpach; 07-18-2011 at 01:01 PM.
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