Extend Deck With Out New Posts - Building & Construction - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 03-06-2010, 09:46 AM   #1
Member
 
Join Date: Apr 2008
Location: Greensboro, NC
Posts: 55
Rewards Points: 75
Default

Extend deck with out new posts


Here are some pictures of my deck that I want to extend. I would like to add as much possible on each side of it with out adding new posts unless. I have been told that I should not go farther than 4 feet. The edge bands are 2x10 and the joists are 2x8. Also I want to put my hot tub on the deck which holds 220 gallons. Will it be strong enough to hold the weight?





So the question is how can I accomplish this?

Thanks,

David
Attached Thumbnails
Extend deck with out new posts-p1040957.jpg   Extend deck with out new posts-p1040958.jpg   Extend deck with out new posts-p1040959.jpg   Extend deck with out new posts-p1040960.jpg   Extend deck with out new posts-p1040961.jpg  

Extend deck with out new posts-p1040962.jpg  

Advertisement

djonesax is offline   Reply With Quote
Old 03-06-2010, 10:02 AM   #2
Civil Engineer
 
Join Date: Mar 2009
Location: Boston
Posts: 4,299
Rewards Points: 2,176
Default

Extend deck with out new posts


So you want to cantilever your deck and put on a hot tub that weight approximately 2000 lbs? Good place to start would be your local code enforcement official. If you want to bypass the code official, or there are no codes in your area, you should hire a structural engineer to evaluate your specific condition. The code official may tell you to do that anyway.

Whether the hot tub can be held is a function of the specific geometry of your deck, and cannot be answered without detailed information regarding the specific sizing and connections of structural elements on your deck, the proposed location of the tub, local code loading requirements, and knowledge of the foundation.

Advertisement

Daniel Holzman is online now   Reply With Quote
The Following 2 Users Say Thank You to Daniel Holzman For This Useful Post:
concretemasonry (03-06-2010), drtbk4ever (03-08-2010)
Old 03-06-2010, 11:20 AM   #3
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

Extend deck with out new posts


I would not put the hot tub on the deck
I'd cut out & build it into the deck, sticking up about 1'
I'd build something underneath to support the hot tub

What you are trying to do would probably mean a total rebuild to support the hot tub & cantilever
What you can do will be determined by local codes & your Building Dept
Scuba_Dave is offline   Reply With Quote
The Following 2 Users Say Thank You to Scuba_Dave For This Useful Post:
concretemasonry (03-06-2010), Willie T (03-06-2010)
Old 03-06-2010, 02:06 PM   #4
Member
 
jlhaslip's Avatar
 
Join Date: Dec 2009
Location: Canadian Rockies
Posts: 1,280
Rewards Points: 500
Default

Extend deck with out new posts


Maximum cantilever of 24 " is a good idea.
__________________
Quote:
Originally Posted by Bud Cline View Post
Go ahead and apply for a variance, those guys at City Hall can use a good laugh.
jlhaslip is offline   Reply With Quote
Old 03-06-2010, 02:56 PM   #5
Lic. Builder/GC/Remodeler
 
AtlanticWBConst.'s Avatar
 
Join Date: May 2006
Location: New England
Posts: 7,556
Rewards Points: 2,000
Default

Extend deck with out new posts


Do not install a hot tub on that deck, the way it is. Do not attempt to attach a cantilever area either for a hot tub.

Bare in mind that you are adding over 1000 pounds of weight. Dependent on the size of the tub, the amount of water it holds, and the number (and size) of people (in it/ around it), also outdoor furniture, pots, plants, etc = on that deck adds up.

Hot Tub Unit + Large Volume of Water + People = A LOT of WEIGHT.


Here's an example of proper dedicated "structural" support for a hot tub (there are three sets of these beams, each with three 6x6 support posts, on 12" dia. sono tubes):

__________________
- Build Well -
AtlanticWBConst. is offline   Reply With Quote
Old 03-07-2010, 04:44 PM   #6
Registered User
 
Join Date: Mar 2009
Posts: 9,977
Rewards Points: 2,020
Default

Extend deck with out new posts


And after the picture they added solid joist blocking to prevent roll-over, post caps and bases for positive connections, and had the local Building Inspector OK-it for their liability Homeowner's Insurance.

Be safe, Gary
__________________
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
The Following User Says Thank You to Gary in WA For This Useful Post:
AtlanticWBConst. (03-08-2010)
Old 03-08-2010, 09:54 AM   #7
Member
 
Join Date: Apr 2008
Location: Greensboro, NC
Posts: 55
Rewards Points: 75
Default

Extend deck with out new posts


OK. So I guess I'll leave the hot tub on the concrete patio under the deck. What about just extending it with out worrying about the hot tub. Can I cantilever a 4 foot extension?

David
djonesax is offline   Reply With Quote
Old 03-08-2010, 01:08 PM   #8
Newbie Bill
 
Join Date: Dec 2008
Location: Alberta, Canada
Posts: 1,056
Rewards Points: 500
Default

Extend deck with out new posts


Hi djonesax, Please clarify what you want to cantilever?

Do you want to cantilever the joists out over the beam (to add width to the deck as measured from the house) or do you want the beam cantilevered over the corner posts (to add length)?

Were you planning a complete rebuild? Regardless of which form of cantilever you wanted, I think it would be easier to start from scratch.
__________________
Bill

A DIY Noob that knows just enough to be dangerous.
drtbk4ever is offline   Reply With Quote
Old 03-08-2010, 03:07 PM   #9
Member
 
Join Date: Apr 2008
Location: Greensboro, NC
Posts: 55
Rewards Points: 75
Default

Extend deck with out new posts


I want to make it larger the cheapest way possible. I was thinking to add 4 feet to each side. It was suggested to me to use cantilevers on each side to support the 4 foot extensions. I was told not to go further than 4 feet using a cantilever.

I have never done this before but am confident that I can do what ever needs to be done if I have a plan. I need to know a reasonable approach and what needs to be done. Maybe there is an article somewhere about extending deck that someone can point me to.

David
djonesax is offline   Reply With Quote
Old 03-08-2010, 03:17 PM   #10
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

Extend deck with out new posts


How far out does the deck come from the house ?
Cantilever needs to be designed to carry the load
For a 4' cantilever you may need to go 8' in along an existing joist for support
You then need to re-inforce the exisiting deck due to up-lift from the cantilever
In some cases you need to go with a larger joist size based on the cantilever
Yours look like only 2x6's (2x8 ?)....you will need bigger joist for the cantilever
You then need a larger ledger board against the house

Local codes will dictate what you are allowed to cantilever
So the 1st step is talking to you local Building Dept on what they will allow & what they will require
You may even need to pour bigger (and more) concrete supports (sono-tubes)
Scuba_Dave is offline   Reply With Quote
Old 03-08-2010, 03:42 PM   #11
Newbie Bill
 
Join Date: Dec 2008
Location: Alberta, Canada
Posts: 1,056
Rewards Points: 500
Default

Extend deck with out new posts


Quote:
Originally Posted by Scuba_Dave View Post
Local codes will dictate what you are allowed to cantilever
So the 1st step is talking to you local Building Dept on what they will allow & what they will require
Yes, this is the first step. 4 Feet seems a bit much in my opinion, but the building codes will dictate that for you. For example in my jurisdiction, the maximum joist cantilever is 24 inches and that is only with joists at least 10 feet long.

From what you are saying is you don't care which way to cantilever as long as it doesn't involve adding more posts. It doesn't matter which direction you go, it will involve a complete rebuild. But if it is permitted you may be able to add 2 feet in each direction. But again check with your local building department.
Attached Thumbnails
Extend deck with out new posts-deckenlargement.jpg  
__________________
Bill

A DIY Noob that knows just enough to be dangerous.

Last edited by drtbk4ever; 03-08-2010 at 03:57 PM.
drtbk4ever is offline   Reply With Quote
Old 03-08-2010, 05:07 PM   #12
Household Handyman
 
Join Date: Feb 2009
Location: Albany, Ga.
Posts: 2,294
Rewards Points: 1,040
Default

Extend deck with out new posts


Maybe I read the OP wrong, but--It seems like he's wanting to add four (4) feet to the existing 2x10 edge bands, with NO post. IF this is the case, I would not recommend this at all. David
Thurman is offline   Reply With Quote
Old 03-08-2010, 05:22 PM   #13
Member
 
Join Date: Apr 2008
Location: Greensboro, NC
Posts: 55
Rewards Points: 75
Default

Extend deck with out new posts


The joists are 2x8 and the banding or whatever its called is 2x10. I didn't want to put more posts in because I have a garden and retaining wall under the deck. if I put more post in they would have to be placed after the garden wall, into the yard and would look really out of place. If I have to add more posts then the best I can do is go to the side about 8 or 9 feet. If I did that, I suppose I could get the hot tub up there as I could add all the posts needed.

David

Advertisement

djonesax is offline   Reply With Quote
Reply


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
Double Level Deck 6x6 posts Skytree Building & Construction 3 09-07-2009 11:47 AM
Guidance needed for deck support posts Mike Loyd Building & Construction 4 08-23-2009 08:03 PM
Deck Posts replacement with load bearing columns from Pacific Columns, Inc Bruce Wilson Building & Construction 7 05-24-2009 03:55 PM
Building a new deck....and creative uses of granite scrap in outdoor living space Rhizzlebop Building & Construction 9 05-15-2009 12:17 PM
Q:Temp support to replace beam and posts on deck dougq Building & Construction 10 09-02-2008 05:24 PM




Top of Page | View New Posts