The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Nyle Kiln Dry Systems

Chainsawr, The Worlds Largest Inventory of Chainsaw Parts





Author Topic: Scarf Joint location in load bearing top plate  (Read 1961 times)

0 Members and 1 Guest are viewing this topic.

Offline Hackermatack

  • Full Member x2
  • ***
  • Posts: 134
  • Age: 68
  • Location: Northeast Kingdom of Vermont
  • Gender: Male
    • Share Post
Scarf Joint location in load bearing top plate
« on: December 29, 2015, 11:04:18 AM »
I have done a good bit of timber framing but am by no means an expert. I have in the past always tried to locate my wedged scarf joints as close to a supporting member as possible. The building that I am going to work on next will be posted every 10' so if 16' timbers are used for the plate it will be almost impossible to keep them all close to a support. The plate will have considerable snow load as it will be timber framed sidewalls with a standard 40' clear span truss. Every other 10' bay will be open and the next will be solid vertical boarded which will add some strength to those bays. I am sure this type of joint is quite strong for vertical load but no way can it be as strong as a solid timber just wondering if anyone knows how much strength is lost? Not particularly worried about it as the posts and plates will be 8 x 8 and with a 24" OC spacing on the trusses every 5th truss will land on a post and the truss either side of it will be nearly over a brace.
Jonsered 2230, 590, 70E. Kioti DK 35 /w fransguard winch. Hudson Oscar 236

Offline beenthere

  • Senior Member x2
  • *****
  • Posts: 26932
  • Location: Southern Wisconsin, USA
  • Gender: Male
    • Share Post
Re: Scarf Joint location in load bearing top plate
« Reply #1 on: December 29, 2015, 12:35:02 PM »
The bending moments considered, then there is more strength when the joint is not near (or over) the post. IIRC about 1/3 of the way out.
But our resident expert @Jim_Rogers can answer better.
south central Wisconsin
 It may be that my sole purpose in life is simply to serve as a warning to others

Offline Jim_Rogers

  • Board Moderator
  • *****
  • Posts: 7492
  • Age: 67
  • Location: Georgetown, MA
  • Gender: Male
  • Keep your chisels sharp.
    • Share Post
    • jrsawmill.com
Re: Scarf Joint location in load bearing top plate
« Reply #2 on: December 29, 2015, 12:50:48 PM »
I have written many posts about scarf joint locations here on this forum. You could/should do a search for them if you haven't seen them already.
As to how much you actually loose, that's a tough engineering question that I am not qualified to answer.

Jim Rogers
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension

Offline canopy

  • Full Member x2
  • ***
  • Posts: 205
  • Location: Thailand
  • Gender: Male
    • Share Post
Re: Scarf Joint location in load bearing top plate
« Reply #3 on: December 30, 2015, 07:49:44 AM »
There is also a thread here about some engineers that tested to failure various scarf joints vs a solid beam and published the results. May not answer your case specifically, but give some idea. Best to get an answer from a timber frame engineer.

Offline timberwrestler

  • Full Member x2
  • ***
  • Posts: 129
    • Share Post
Re: Scarf Joint location in load bearing top plate
« Reply #4 on: December 30, 2015, 11:00:23 AM »
8x8s spanning 10', with 40' trusses on them are a little thin.  At 40 psf snow load, the 8x8 has about 1/2 of the bending strength needed.  I don't know what your ground snow load is, or the roof pitch, or roof material, so it could be a little higher or lower.  It'll 'probably' be OK, but not by the book.  Of course, you don't have a book in NE VT.

Offline Hackermatack

  • Full Member x2
  • ***
  • Posts: 134
  • Age: 68
  • Location: Northeast Kingdom of Vermont
  • Gender: Male
    • Share Post
Re: Scarf Joint location in load bearing top plate
« Reply #5 on: December 30, 2015, 12:36:16 PM »
I will have to research that a bit, seems like the braces would transfer some of the load back onto the post. Guess we could go with 8' bays and make all of the splices on a post with a thru tendon.
Jonsered 2230, 590, 70E. Kioti DK 35 /w fransguard winch. Hudson Oscar 236

Offline beenthere

  • Senior Member x2
  • *****
  • Posts: 26932
  • Location: Southern Wisconsin, USA
  • Gender: Male
    • Share Post
Re: Scarf Joint location in load bearing top plate
« Reply #6 on: December 30, 2015, 01:10:37 PM »
Don't think you want the splices on the posts.
Do some more research... and think you will find out why.
south central Wisconsin
 It may be that my sole purpose in life is simply to serve as a warning to others

Offline jimdad07

  • Senior Member
  • ****
  • Posts: 389
  • Age: 38
  • Location: Clayton, NY
  • Gender: Male
  • Seeking Information
    • Share Post
Re: Scarf Joint location in load bearing top plate
« Reply #7 on: January 15, 2016, 12:12:26 PM »
Any way you can upsize the beams?  You may not be happy changing your floor plan just to accommodate the beam sizing, the beams should be sized to accommodate the space you want and the loads that are planned.
Hudson HFE 30 Homesteader bandmill w/28' of track
Couple tractors, a bunch of chainsaws and not enough time to use them.


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
Top plate scarf location

Started by stevensam on Timber Framing/Log construction

19 Replies
6187 Views
Last post August 26, 2010, 11:02:21 PM
by stevensam
xx
scarf joint location

Started by jtbartlett on Timber Framing/Log construction

8 Replies
5214 Views
Last post April 03, 2011, 08:57:42 PM
by jtbartlett
xx
Principle Rafter and Plate Scarf Location

Started by routestep on Timber Framing/Log construction

11 Replies
3731 Views
Last post February 28, 2008, 10:52:47 PM
by Don P
xx
scarf joint story

Started by canopy on Timber Framing/Log construction

2 Replies
5050 Views
Last post February 10, 2014, 08:20:01 PM
by canopy
 


Powered by EzPortal