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Help squaring posts for a pole barn #6932428
07/17/20 08:15 AM
07/17/20 08:15 AM
Joined: Dec 2006
Posts: 414
NY
Niteblaster Offline OP
trapper
Niteblaster  Offline OP
trapper

Joined: Dec 2006
Posts: 414
NY
Getting ready to set posts for a small pole barn and I want to make sure I have my dimensions correct when I set my posts so asking for professional help here. It's going to be small to start. 20x20 it will have 3 posts along the outside and 3 more in the inside center total 9 all together. At what measurement should my posts be for it to be square and so that I can run the 2x8x10 around the top. I assume it would need to be less to account for the 1.5" 2x8x10 running around the outside of the posts? Thanks. Any other info appreciated.

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932441
07/17/20 08:29 AM
07/17/20 08:29 AM
Joined: Jan 2014
Posts: 1,986
Shenandoah County, VA
L
l1ranger Offline
trapper
l1ranger  Offline
trapper
L

Joined: Jan 2014
Posts: 1,986
Shenandoah County, VA
Niteblaster - where is your 20x20 dimension?
is that the inside room dimensions or is that outside corner to corner

what size posts, 6x6?

I can sketch something up quick in CAD with whatever dimensions you need


Josh
Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932443
07/17/20 08:30 AM
07/17/20 08:30 AM
Joined: Dec 2007
Posts: 1,012
Missouri
ol' dad Offline
trapper
ol' dad  Offline
trapper

Joined: Dec 2007
Posts: 1,012
Missouri
Use Pythagorean Theorem. A2+B2=C2. Your hypotenuse should be 28.1" from outside corner to outside corner if my math is correct.

ol'dad


Started with nothing and still got most of it
Re: Help squaring posts for a pole barn [Re: ol' dad] #6932446
07/17/20 08:34 AM
07/17/20 08:34 AM
Joined: Dec 2006
Posts: 42,085
Minnesota
330-Trapper Offline
trapper
330-Trapper  Offline
trapper

Joined: Dec 2006
Posts: 42,085
Minnesota
Originally Posted by ol' dad
Use Pythagorean Theorem. A2+B2=C2. Your hypotenuse should be 28.1" from outside corner to outside corner if my math is correct.

ol'dad


That answer wasn't in the back of mu math book.


NRA and NTA Life Member
www.BackroadsRevised@etsy.com




Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932452
07/17/20 08:36 AM
07/17/20 08:36 AM
Joined: Jun 2007
Posts: 10,274
Finally run aground in TN
Scuba1 Offline
"color blind Kraut"
Scuba1  Offline
"color blind Kraut"

Joined: Jun 2007
Posts: 10,274
Finally run aground in TN
The diagonal to the outside corners of your posts of a 20 x 20 building should be 28,28 ' the the building will be square. Then string a line between the outside posts and set the center ones to the line.

the math for that is a square plus b square is c square......... consequently the root from c gives you the length of that line.


In your case (20X20) + (20X20 = 800 The square root of 800 is 28,28


I do all my own stunts ..... but never intentionally
Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932453
07/17/20 08:37 AM
07/17/20 08:37 AM
Joined: Jun 2007
Posts: 10,274
Finally run aground in TN
Scuba1 Offline
"color blind Kraut"
Scuba1  Offline
"color blind Kraut"

Joined: Jun 2007
Posts: 10,274
Finally run aground in TN
330 beat me to it


I do all my own stunts ..... but never intentionally
Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932455
07/17/20 08:38 AM
07/17/20 08:38 AM
Joined: Feb 2019
Posts: 357
ontario, canada
O
old243 Offline
trapper
old243  Offline
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O

Joined: Feb 2019
Posts: 357
ontario, canada
I would consider buying 2x8x20 foot planks for the uper plate. if they are available. Will give your building more stability. old243

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932461
07/17/20 08:43 AM
07/17/20 08:43 AM
Joined: Dec 2006
Posts: 414
NY
Niteblaster Offline OP
trapper
Niteblaster  Offline OP
trapper

Joined: Dec 2006
Posts: 414
NY
20x20 is outside dimension, posts will be 4x6 and 20' planks are not available I don't believe have not gone to order yet going this afternoon if they are I will go with them.

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932468
07/17/20 08:54 AM
07/17/20 08:54 AM
Joined: Jan 2014
Posts: 1,986
Shenandoah County, VA
L
l1ranger Offline
trapper
l1ranger  Offline
trapper
L

Joined: Jan 2014
Posts: 1,986
Shenandoah County, VA
nite - PM sent with email.


Josh
Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932523
07/17/20 09:42 AM
07/17/20 09:42 AM
Joined: Oct 2011
Posts: 496
Hilton, NY
P
Paul D. Heppner Offline
trapper
Paul D. Heppner  Offline
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P

Joined: Oct 2011
Posts: 496
Hilton, NY
20x20 is the same as a 45x45x90 degree triangle. So being a retired design engineer the shortcut is length of the leg times 1.414 (1:1:square root 2) gives you the hypotenuse (28 feet 3.36 inches).

Scuba got it, just a different route.

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932540
07/17/20 10:07 AM
07/17/20 10:07 AM
Joined: May 2020
Posts: 230
Alabama
cheechako Offline
trapper
cheechako  Offline
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Joined: May 2020
Posts: 230
Alabama
Ok so Iíll take this question one step further. You measure your hypotenuse and youíre out an inch, so you adjust. Now it throws off the hypotenuse of your other angle. So I know you have to take away or add to the other length I just donít remember which.

Which is it and whatís the best way to do it?

Last edited by cheechako; 07/17/20 10:08 AM.

The trapper formerly known as sanfo008
Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932556
07/17/20 10:32 AM
07/17/20 10:32 AM
Joined: Dec 2006
Posts: 15,119
SEPA
L
Lugnut Offline
trapper
Lugnut  Offline
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L

Joined: Dec 2006
Posts: 15,119
SEPA
The T-man mathematicians are just showing off. Just measure diagonally from outside corner to outside corner and then do the other two corners. Adjust until the two measurements are the same.No need for complicated math formulas.


Eh...wot?

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932571
07/17/20 10:53 AM
07/17/20 10:53 AM
Joined: Jan 2011
Posts: 1,959
Va. Lee Co.
D
Donnie H Offline
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Donnie H  Offline
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D

Joined: Jan 2011
Posts: 1,959
Va. Lee Co.
What Lug said...

Re: Help squaring posts for a pole barn [Re: Donnie H] #6932581
07/17/20 11:08 AM
07/17/20 11:08 AM
Joined: Jul 2016
Posts: 2,968
Michigan
D
Ditchdiver Offline
trapper
Ditchdiver  Offline
trapper
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Joined: Jul 2016
Posts: 2,968
Michigan
Originally Posted by Donnie H
What Lug said...

◊2.
I will say though, this site is full of an array of very smart people. A bunch of "mountain men" trappers talking about hypotenuse and A2+B2, whodathunkit!
I love this place!


When life gets me down..... you know hunting/trapping season is closed.
Re: Help squaring posts for a pole barn [Re: cheechako] #6932601
07/17/20 11:26 AM
07/17/20 11:26 AM
Joined: Mar 2007
Posts: 31,752
McGrath, AK
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white17 Offline

"General (Mr.Sunshine) Washington"
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"General (Mr.Sunshine) Washington"
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Joined: Mar 2007
Posts: 31,752
McGrath, AK
Originally Posted by cheechako
Ok so Iíll take this question one step further. You measure your hypotenuse and youíre out an inch, so you adjust. Now it throws off the hypotenuse of your other angle. So I know you have to take away or add to the other length I just donít remember which.

Which is it and whatís the best way to do it?



If you are "out" an inch, you shorten the 'long' side by half an inch. You need one fixed corner point that you never adjust. It is your reference for all other posts


Mean As Nails
Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932614
07/17/20 11:37 AM
07/17/20 11:37 AM
Joined: Dec 2009
Posts: 12,049
The Hill Country of Texas
Leftlane Offline
"HOSS"
Leftlane  Offline
"HOSS"

Joined: Dec 2009
Posts: 12,049
The Hill Country of Texas
YOu are getting great advice- you can even line out those posts w/ the 2x8s laying on the ground and already have them measured diagonally. It can also be said that if your 2x8s are the right length- a string can be used for your corner checks and you can leave the tape at home.


ďWhatís good for me may not be good for the weak minded.Ē
Captain Gus McCrae- Texas Rangers


Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932621
07/17/20 11:48 AM
07/17/20 11:48 AM
Joined: Dec 2006
Posts: 809
Sugar Grove, WV
J
JTfromWV Online content
trapper
JTfromWV  Online Content
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Joined: Dec 2006
Posts: 809
Sugar Grove, WV
The hard part with squaring pole buildings is getting them square both at ground level and at the header for your trusses or rafters. Posts tend to bow and twist some.

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932625
07/17/20 11:59 AM
07/17/20 11:59 AM
Joined: Dec 2006
Posts: 15,119
SEPA
L
Lugnut Offline
trapper
Lugnut  Offline
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Joined: Dec 2006
Posts: 15,119
SEPA
Once you have it squared at ground level you just need to make sure your posts are plumb and youíre good to go.


Eh...wot?

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932626
07/17/20 12:00 PM
07/17/20 12:00 PM
Joined: Jan 2007
Posts: 5,327
Wisconsin
M
Moosetrot Offline
trapper
Moosetrot  Offline
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M

Joined: Jan 2007
Posts: 5,327
Wisconsin
There's a reason I never, ever build ANYTHING!

Moosetrot

Re: Help squaring posts for a pole barn [Re: Niteblaster] #6932647
07/17/20 12:29 PM
07/17/20 12:29 PM
Joined: May 2012
Posts: 4,818
michigan,USA
S
seniortrap Offline
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seniortrap  Offline
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S

Joined: May 2012
Posts: 4,818
michigan,USA
Setting your initial post and putting cement in the hole and bracing it to the level both ways will work. Then you have a constant control point to work with.

Measuring becomes the normal at the base/top of the new posts to be accurate. Once all post are in, cover around the base where concrete will attach.

Use the base of the poles for your cement floor forms. That will hold it all in well and make it easier to pour now than later with sides on.

Last edited by seniortrap; 07/17/20 12:31 PM.

Vietnam--1967 46th. Const./Combat Engineers

"Chaotic action is preferable to orderly inaction."
"After the first shot, all plans go out the window!"
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