Porch building question

[175gr7.62]

We are going to build a 12ft deep 40ft long free-standing porch along the front of the cabin. Basically a simple rectangle and my wife wants the deck boards to run with the 12ft width. So my question is what is going to be my best best with regards to joist sizing, spacing, and span? I was thinking 2x6's on 24" centers with a 6ft span.

[dhillis]

We are going to build a 12ft deep 40ft long free-standing porch along the front of the cabin. Basically a simple rectangle and my wife wants the deck boards to run with the 12ft width. So my question is what is going to be my best best with regards to joist sizing, spacing, and span? I was thinking 2x6's on 24" centers with a 6ft span.

How big a boy are ya?

[bullhead44]

I went with 24 inch centers and had to go back later and add support. I would go with 16 inch centers if I did it again.

[Colorado87]

2x10's on 16" spacing or 2x8's on 12" would be my answer. YOu could probably get away with 2x8's on 16" if you wanted.

[PEC]

If you are buying 2x6x12 you are only looking at spending around $100 more to put on 16" centers and you would have no worries.

[Texastaxi]

If you did it in 4, 10' sections, a 2x8 will span the 10' easily.
16" centers, for sure.

[RDT]

If you plan to use 2x s one the floor you will be ok except you need
to make the spans 5' If you use 1x s on the floor you will need to
have joists on 16" centers

[Quackerbox]

I did a 6x12 on the front of my cabin. Framed with 2x6s, joists on 16" center with 2x4s spanning 6' and floor was 1x6s running 12'. All treated

[hunt247]

If you did it in 4, 10' sections, a 2x8 will span the 10' easily.
16" centers, for sure.

This!

[CastAndBlast]

At least 16" centers, if not, you will be adding supports in as soon as you walk on it.

[sticks]

according to the 2015 IRC table R507.5 DECK JOIST SPANS FOR COMMON LUMBER, 2x6 southern pine joist at 16" oc can span 9'
so as long as your support beams under the joist are 9' or less (8' works out for 40') you are good.

at 24" oc your span should be less than 7'7"

that's what the code says, not opinion.

for your project 16" oc is only 10 more boards! respect your time, put in the extra material.

[sticks]

according to the 2015 IRC table R507.5 DECK JOIST SPANS FOR COMMON LUMBER, 2x6 southern pine joist at 16" oc can span 9'
so as long as your support beams under the joist are 9' or less (8' works out for 40') you are good.

at 24" oc your span should be less than 7'7"

that's what the code says, not opinion.

for your project 16" oc is only 10 more boards! respect your time, put in the extra material.

actually 120 lin ft (3 40' runs)

[cashcropper]

Your 2x6 joists would be fine even on 24" centers if you make your span 4 ft instead of 6. Your joist would be supported at 0,4,8and12 ft instead of 0,6and 12. Just by adding another row of footings.