Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Carpentry


Thread Tools Search this Thread Display Modes
Old 12-18-2011, 07:10 PM   #1
Join Date: Dec 2011
Posts: 1
Share |

2x8 span

will a true 2"X8" span a 16' area and have enough support for a floor at 12" centers

dannyelson is offline   Reply With Quote
Old 12-18-2011, 07:19 PM   #2
Framing Contractor
Join Date: Feb 2009
Location: NE Ohio
Posts: 1,094

2x8 span


sixeightten is online now   Reply With Quote
Old 12-18-2011, 07:28 PM   #3
Registered User
Join Date: Mar 2009
Posts: 9,968

2x8 span

Yep, a sleeping room or attic floor, of certain few species and "Select structural" grade, if under the IRC; http://publicecodes.citation.com/ico...002_par017.htm

If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 12-18-2011, 07:57 PM   #4
wareagle's Avatar
Join Date: Apr 2011
Location: Nashville
Posts: 70

2x8 span

go here and check it youself.

wareagle is offline   Reply With Quote
Old 12-27-2011, 02:20 PM   #5
Retired carpenter
Join Date: Dec 2011
Location: Portland, Oregon
Posts: 303

2x8 span

You would be much better off using 2x12s at 16" O.C. If you have to stick with 2x8s, I would use double 2x8s at 16" O.C.
abracaboom is offline   Reply With Quote
Old 12-28-2011, 07:41 AM   #6
Join Date: Sep 2010
Location: Freeport Maine
Posts: 484

2x8 span

I can't speak for a 16 foot span, but I have several 13 foot spans (true 2x8) in my old house which are holding up well. Granted, the lumber may be a bit better quality than what is available today..........and after 100 years there is admittedly a bit of sag here and there.
That's just my opinion. But it's free, so take it for what it's worth to you.
1910NE is offline   Reply With Quote
Old 12-28-2011, 06:51 PM   #7
journeyman carpenter
woodworkbykirk's Avatar
Join Date: Sep 2011
Location: nova scotia canada
Posts: 2,681

2x8 span

if im using 2x8's i space them 12"o.c.. ive seen new decks that had 2x8 joists with a 12' span and had quite a bit of bounce in them . not a good thing for a new deck

i strongly suggest switching to 12 " o.c and adding 2 or 3 rows of blocking to help stiffen it up
woodworkbykirk is offline   Reply With Quote
Old 12-28-2011, 07:52 PM   #8
Civil Engineer
Join Date: Mar 2009
Location: Boston
Posts: 4,200

2x8 span

All joists used in residential construction must be evaluated both for strength and deflection. Without detailed information about the load your joists are required to carry, which is TYPICALLY determined by code considerations, it is not possible to determine if your joists are adequately strong or adequately stiff. If you happen to have lumber which meets the specific criteria in your code book, you can evaluate the stiffness and strength for a given room type loading, however you stated that you have "true" dimension lumber, therefore you are not going to be able to use standard tables. Of course, if you are planning to construct without a permit, and not to code, then you can evaluate the adequacy of your joists any way you see fit, including taking advice from an internet chat forum.

Daniel Holzman is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pergola construction - beam span without sagging fahartle Building & Construction 9 07-25-2010 07:54 PM
How to calculate Joist span table for 3x8's WillSTX Building & Construction 22 03-19-2010 04:41 PM
Center bearing vs. Clear Span floors -- Span Tables WaldenL Building & Construction 1 10-09-2009 12:24 PM
Building a patio cover...span and size of lumber Q's jongordo8 Building & Construction 1 08-30-2009 12:08 AM
Patio Roof Beam Span slakfu Building & Construction 4 06-03-2009 10:45 PM

Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.