Floor beams


  #1  
Old 09-26-13, 06:16 PM
D
Member
Thread Starter
Join Date: Sep 2013
Location: Canada
Posts: 3
Upvotes: 0
Received 0 Upvotes on 0 Posts
Post Floor beams

I have bought a house that is 25 ft. x 44 ft. the floor joists run accross the 25 ft span
and there are three beans that run the length they are made of 6" x 6" that are supported about every 8 ft. with steel jack posts. Is this strong enough?? It is a 40 year old house and it seem to be solid, but I am not sure about the 6 x 6???
This is a one story house and the beams are in the crawl space.
 
  #2  
Old 09-27-13, 03:02 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
Welcome to the forums!! What is your floor joist sizing? 2xX. Depending on that answer, I see no problem with the 6x6, nor the support being at every 8'. In fact it seems to be a little overkill. HOWEVER, with that said, what are the posts sitting on? They must be sitting on poured footings, measuring about 12" x 12" x 12" deep. If not, then you could have a sinking problem with the posts.
 
  #3  
Old 09-28-13, 02:51 PM
BridgeMan45's Avatar
Member
Join Date: Oct 2011
Location: USA
Posts: 2,838
Upvotes: 0
Received 1 Upvote on 1 Post
If no appreciable settlement has occurred over the last 40 years, I suspect it's not likely to start now.

Unless all of your furniture is made of cast iron, and you, your family and house guests all weigh many hundreds of pounds each.
 
  #4  
Old 09-28-13, 04:15 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
Unless the supports were installed prior to sale to shore up a sagging floor. Time.
 
  #5  
Old 09-28-13, 04:45 PM
BridgeMan45's Avatar
Member
Join Date: Oct 2011
Location: USA
Posts: 2,838
Upvotes: 0
Received 1 Upvote on 1 Post
Not likely in this scenario. A 6 x 6 beam cannot clear-span 44', unless it's made of high carbon steel, or has very little joist loading on it.
 

Last edited by BridgeMan45; 09-28-13 at 07:14 PM.
  #6  
Old 09-28-13, 05:54 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
Footing supports may be age of house, but as with my house of the same age, they did (or would) not use 6x6 for beams. They would use doubled or tripled dimension lumber. Of course the 6x6 may give good support at 8' vertical, but I'm not sure they were in common use as beams back then. We're just guessing, anyway. Probably good to go.
 
  #7  
Old 09-28-13, 07:17 PM
G
Member
Join Date: Mar 2013
Location: USA
Posts: 412
Upvotes: 0
Received 0 Upvotes on 0 Posts
Of the total 25' span, with a beam down the middle (perpendicular), you are carrying 12-1/2' of floor times 8' = 100sq.ft. X 40psf (usually residential) = 4k# Your 6x6 if Doug/Fir 1500Fb is rated at carrying 3832# total, slightly under what you have described (if span, species and Fb is correct). You have 3832/8= 479/12.5= 38#per sq.ft., slightly below minimum code- though the beam may be a Number 1 rather than #2, so you would be above the 40# minimum. As said, it lasted this long. You would be hard pressed to load to maximum of 38#.....

Gary
 

Last edited by Gary in WA; 09-28-13 at 08:03 PM.
  #8  
Old 09-28-13, 07:21 PM
BridgeMan45's Avatar
Member
Join Date: Oct 2011
Location: USA
Posts: 2,838
Upvotes: 0
Received 1 Upvote on 1 Post
Chandler, the OP is in Canada, where they may do things quite differently than is usually done in Georgia.

And besides, the few Canucks I've worked with never liked the term "guessing." They consistently preferred the more refined "guesstimating."

Gary, the beam length in question is 44', not 25'. The joists span 25'.
 
  #9  
Old 09-28-13, 08:01 PM
G
Member
Join Date: Mar 2013
Location: USA
Posts: 412
Upvotes: 0
Received 0 Upvotes on 0 Posts
I understood he was asking if the 6x6 beams (spanning 8' running down the middle for 44') are strong enough for the floor load (12.5' of joists).... 44'/3 beams = 14.66'/2 posts= 7.33' or 7'4" span between posts--- if spaced correctly at install.

Gary
 
  #10  
Old 10-04-13, 05:48 AM
D
Member
Thread Starter
Join Date: Sep 2013
Location: Canada
Posts: 3
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thank you for the replies. I was away from my computer for a few days.
In reply to your questions:
There are 3 rows of beams and there are jack posts approx every 8' they are sitting on concret pads and the floor joists are 2" x 6" on 16" centres.
There is no sagging
 
  #11  
Old 10-04-13, 03:46 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
Clarification needed for me, anyway. 3 rows of beams, or one row with 3 sections?
 
  #12  
Old 10-04-13, 05:20 PM
D
Member
Thread Starter
Join Date: Sep 2013
Location: Canada
Posts: 3
Upvotes: 0
Received 0 Upvotes on 0 Posts
There are 3 rows of beams
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: