Deck Board Thickness Vs Frame Spacing - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 05-05-2009, 08:48 AM   #1
weekend warrior
Hobb3s's Avatar
Join Date: Apr 2008
Location: Ottawa, Ontario
Posts: 92
Rewards Points: 75

Deck board thickness vs frame spacing

I'm in the midst of tearing apart my old deck down to the frame to replace the decking, railing, and stairs. The old decking was 2x4's. Now having taken most of them off, I've found that the structure underneath was built at two different times. So I've got half a deck with 16"oc and the other half with 19.5"oc.

My question is what thickness of decking do I need to for stability with the 19.5"oc., is 5/4" thick enough to prevent sagging and bounce? I was thinking of 5/4x6 in 10 ft lengths. (Deck is 27.5'x8.5').


Hobb3s is offline   Reply With Quote
Old 05-06-2009, 04:42 PM   #2
Join Date: May 2009
Location: Moneta, VA
Posts: 32
Rewards Points: 25

how bouncy?

I've seen 5/4 on 24" centers, but I'd never build it.
On 19.5" there will probably be some flex.
I think it's a matter of your tolerance.
Why not grab one 10' 5/4 from the lumber store, throw it on the deck and walk on it. Get 2 people to stand on opposite ends to mimic the fasteners that will be there, if you have the extra bodies.
Personally, I think it'll be fine.
Don't see 19.5 very often though.


VaViaCo is offline   Reply With Quote
Old 05-07-2009, 01:26 AM   #3
Structural Engineer
Join Date: Oct 2008
Location: Midwest
Posts: 64
Rewards Points: 75

Are the 19.5" OC joist fastened using joist hangers? If so it be pretty easy to reposition/replace the joist so that they too are at 16" OC. You might end up with an oddball spacing at one end, but it would take care of those deflections concerns so part of the deck will not seem bouncy.
wildcat is offline   Reply With Quote

Thread Tools
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
Deck Joist Spacing udlooz Building & Construction 19 11-05-2008 06:42 PM
replacing rotted sill plate and rim joist behind a deck ledger board tommyt Building & Construction 2 08-11-2008 07:38 PM
Deck Building Question - Installing Ledger Board to Rim Joists Ler0y Jenkins General DIY Discussions 20 05-18-2008 11:05 AM
PTP deck board quality sk8z Building & Construction 3 04-07-2008 06:01 PM
Installing deck ledger board over foam board? RickT Building & Construction 5 11-06-2006 10:50 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1