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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-04-2009, 10:19 AM   #1
Newbie
 
Join Date: Aug 2009
Posts: 17
Share |
Question

deck sway


I am building a 13x16 deck attached to the house and based on slope of yard, goes from appr 4.5'-6' over ground. I am using 2x10 wood. my question is on the deck "Sway" that is parallel to the house- Any recommondations to reduce the sway? I was told to use 4x4 posts. Used simpson ties/post braces, etc.

All wood has been purchased and the frame has been installed. I have not installed the deck boards yet, but the frame iteslf seems to sway too much at this point.

Thanks for your help.
Adam

redroc25 is offline   Reply With Quote
Old 09-04-2009, 10:23 AM   #2
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

deck sway


Do you have a picture?
How high off the ground is the end of the deck, only the ~6' you mentioned?

Scuba_Dave is offline   Reply With Quote
Old 09-04-2009, 10:42 AM   #3
Member
 
concretemasonry's Avatar
 
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,730
Default

deck sway


So far you have not mentioned anything that would eliminate the "sway" of the outer frames. Do you have any drawings or photos?

The decking can stiffen it up, depending on the direction it is laid. You can also install horizontal diagonal bracing to the bottom of the joists or vertical diagonals between the posts and the outside girder/beam. Nailed joints and 90% of the metal connectors do not provide connections that cannot rotate some - especially with a bunch of people moving around on the 13x16 deck.

Who designed the deck and who got the permit?

I assume it is the non-preferred ledger method of connection to the house and hope that you used through bolts instead of lags and installed flashing under your moisture barrier. It may be too late for that now.

Dick
concretemasonry is online now   Reply With Quote
Old 09-05-2009, 10:21 AM   #4
Newbie
 
Join Date: Aug 2009
Posts: 17
Default

deck sway


I designed the deck with both HD and Loews, both were relatively the same design. I however incorrectly listed the size of the deck on my post, the deck that sways is 16x20 (sorry, had two built the other one is fine!).

top height off of the ground is 6'. the ledger is bolted to house with bolts (Not bolted through), but this isnt the sway problem! It sways at the 20 foot away from the house in the same direction of the house (ie parrallel).

The deck boards will run in the same direction the deck is currently swaying (again parrallel).

Thanks again.

Adam
redroc25 is offline   Reply With Quote
Old 09-05-2009, 11:48 AM   #5
Newbie
 
Join Date: May 2008
Posts: 21
Default

deck sway


The floorboards will take most of the sway out...but also use 2 1/2 foot diagonals (2 per post) lagged in with 31/2" lags
JonM is offline   Reply With Quote
Old 09-05-2009, 11:51 AM   #6
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

deck sway


Take a look at this deck/pavillion thread with the cross bracing at the posts

pavilion build help!

What do you have for posts & framing structure?
How far apart, beam sizes...etc
Without some idea of how the deck is built its hard to give a recommendation
Scuba_Dave is offline   Reply With Quote
Old 09-05-2009, 11:54 AM   #7
Licensed P.E./Home Insp
 
Aggie67's Avatar
 
Join Date: Dec 2008
Location: New Jersey
Posts: 587
Default

deck sway


Generally accepted good practice will include the use of braces, blocking, and properly sized piers/posts. If you haven't downloaded the AWC's Prescriptive Residential Wood Deck Construction Guide (it's free), please do so. Read that, and if you have any questions, please post back.

Please note that the design guide recommends 6x6 posts, so you're already behind the 8 ball in my opinion. And depending on the span you have and wood species, 2x10 joists may not cut it.
Aggie67 is offline   Reply With Quote
Old 09-05-2009, 12:15 PM   #8
Member
 
concretemasonry's Avatar
 
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 3,730
Default

deck sway


If you find it sways too much, you will have to install diagonal braces in the "frame" that is parallel to the house.

Most metal nailed corner braces do not really provide any real resistance to rotation. They are strong and reliable in other ways as they are intended to be.

Dick
concretemasonry is online now   Reply With Quote
Old 09-06-2009, 09:44 AM   #9
Newbie
 
Join Date: Aug 2009
Posts: 17
Wink

deck sway


Ok, so I am going to try the braces on the posts at 45 degree angles to see if that helps....in the mean time, to answer some of your questions, in an effort to help me:

1- deck is attached to house with anchor bolts
2- deck is 16 x 20, using 2x10 joists, spaced appr 16" on center
3- ledger boards are double 2x10's at approx 11' and 19'marks. From what I have read, this is leaving an allowable spacing using 2x10 joists.
4- I have used 4x4 posts, on concrete footers 36" deep (as needed for permit).
5- Designed deck using Loews/HD computer program, both stated 4x4 would be acceptable.
6- 3 posts on each ledger at the 11 and 19' marks (one at each edge, and then in the middle), used post brackets on the cement/post and then again used brackets to hold the ledgers on the posts (ledgers are resting on the posts utilizing the brackets).
7- I added blocks at approx the 5' mark (so then there is now lateral support at the 5' and 11' (where ledger exists) and again at approx 15' as well.
8-used simpson ties for each connection to a ledger board at each crossing, used corner brackets too from simpson.
9- deck is attached to the house, where it is appr 5' off the ground, at the edge 20 feet out, the deck is 6' off the ground due to the slope of my yard.
10-i will be using composite deck boards after the inspector approves the framing!

thanks, I think that describes all of the deck and again thanks for your help in trying to solve my sway problem!
adam

Last edited by redroc25; 09-06-2009 at 09:46 AM.
redroc25 is offline   Reply With Quote
Old 09-06-2009, 11:47 AM   #10
Framing Contractor
 
Join Date: Apr 2006
Location: Caldwell, NJ
Posts: 1,758
Default

deck sway


Quote:
Originally Posted by redroc25 View Post
Ok, so I am going to try the braces on the posts at 45 degree angles to see if that helps....in the mean time, to answer some of your questions, in an effort to help me:

1- deck is attached to house with anchor bolts
2- deck is 16 x 20, using 2x10 joists, spaced appr 16" on center
3- ledger boards are double 2x10's at approx 11' and 19'marks. From what I have read, this is leaving an allowable spacing using 2x10 joists.
4- I have used 4x4 posts, on concrete footers 36" deep (as needed for permit).
5- Designed deck using Loews/HD computer program, both stated 4x4 would be acceptable.
6- 3 posts on each ledger at the 11 and 19' marks (one at each edge, and then in the middle), used post brackets on the cement/post and then again used brackets to hold the ledgers on the posts (ledgers are resting on the posts utilizing the brackets).
7- I added blocks at approx the 5' mark (so then there is now lateral support at the 5' and 11' (where ledger exists) and again at approx 15' as well.
8-used simpson ties for each connection to a ledger board at each crossing, used corner brackets too from simpson.
9- deck is attached to the house, where it is appr 5' off the ground, at the edge 20 feet out, the deck is 6' off the ground due to the slope of my yard.
10-i will be using composite deck boards after the inspector approves the framing!

thanks, I think that describes all of the deck and again thanks for your help in trying to solve my sway problem!
adam
Install the decking FIRST and then see if it still sways. No need for anything else until you install the decking. Every single deck sways a little until it has the decking.
__________________
Joe Carola
Joe Carola is offline   Reply With Quote
Old 09-06-2009, 02:19 PM   #11
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

deck sway


"1- deck is attached to house with anchor bolts Through bolts w. nuts and flat washers, all dipped galv. Table #5, 14" through 1/2" ply and 1-1/8" engineered rim = 14" o.c. with 1-1/2" solid rim = 29" o.c.
2- deck is 16 x 20, using 2x10 joists, spaced appr 16" on center May want to reduce to 14" or so.
3- ledger boards are double 2x10's at approx 11' and 19'marks. From what I have read, this is leaving an allowable spacing using 2x10 joists. Built beams, install sticky window wrap on top edges, by Grace. Seals nail holes.
4- I have used 4x4 posts, on concrete footers 36" deep (as needed for permit). Use sono's on a footing, 15"x6" - if span of beam is reduced, to get post out of ground and protect against frost heave with gravel: http://books.google.com/books?id=1gg...num=3#PPA31,M1 http://rockproducts.com/mag/rock_agg...prevent_frost/ http://www.sustland.umn.edu/implemen..._footings.html
5- Designed deck using Loews/HD computer program, both stated 4x4 would be acceptable. Not per 2006 code, as Aggie said: http://www.awc.org/Publications/DCA/DCA6/DCA6.pdf
6- 3 posts on each ledger at the 11 and 19' marks (one at each edge, and then in the middle), used post brackets on the cement/post and then again used brackets to hold the ledgers on the posts (ledgers are resting on the posts utilizing the brackets). Over span as per code = 6'2" figuring 50# sq. ft.
7- I added blocks at approx the 5' mark (so then there is now lateral support at the 5' and 11' (where ledger exists) and again at approx 15' as well." Blocking, same size as joist, required at all bearing to prevent rotation.

Let's see some finished pics when done! Hope this helps....
Be safe, G
Gary in WA is offline   Reply With Quote
Old 09-13-2009, 02:46 PM   #12
Newbie
 
Join Date: Aug 2009
Posts: 17
Talking

deck sway


I added two 6x6 posts to the end the deck was swaying and man what a difference!!

Thanks for all your help and advice, my deck sway problem is now fixed. Based on the comments about adding the deck boards, now the minimal movement should clearly be stopped when I add the deck this week@!!

redroc25 is offline   Reply With Quote
Reply

Tags
deck, deck concrete, deck repair


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
Building a new deck......suggestions? thoughts? Rhizzlebop Building & Construction 38 06-24-2009 05:07 PM
Post detail for raised covered deck jogr Building & Construction 3 05-16-2009 07:46 AM
Building a new deck....and creative uses of granite scrap in outdoor living space Rhizzlebop Building & Construction 9 05-15-2009 11:17 AM
Extend House Roof Over Back Deck Justahome Carpentry 17 04-05-2009 03:42 PM
The Bioswale, french drain, deck, drainage dilemma (long) seabright_sc Building & Construction 2 01-05-2008 03:37 PM




Top of Page | View New Posts

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