Advice on Warpage - Woodworking Talk - Woodworkers Forum
 1Likes
  • 1 Post By WesTex
 
Thread Tools Display Modes
post #1 of 8 Old 05-15-2018, 06:52 PM Thread Starter
Junior Member
 
Join Date: Dec 2016
Posts: 3
View Chris Sinsigalli's Photo Album My Photos
Advice on Warpage

I have a pressure-treated 6x6 post pergola on my back deck. I have added a little design element and made some post bases that I've just lightly nailed on. I wasn't sure if I was going to like it when I installed it last fall, so I had only put in two or three nails in to temporarily hold it on. The bases are mitered pieces of pressure treated 1 by lumber. Now I've been dealing with some water causing warpage. I believe the 1by lumber is just too thin to hold its shape.
So I'm looking for advice on how to make this fit better and deal with [less] warping. I'm not sure if doing miters was a good thing. Perhaps I need a different fastener, glue, or a different kind of joint.
I attached a couple pictures, you can see the gap on a dry day, and then you can see it on a wet day.
Attached Thumbnails
Click image for larger version

Name:	IMG_7554.jpg
Views:	66
Size:	403.9 KB
ID:	359994  

Click image for larger version

Name:	IMG_7555.jpg
Views:	63
Size:	457.0 KB
ID:	360002  

Click image for larger version

Name:	IMG_7603.jpg
Views:	60
Size:	443.3 KB
ID:	360010  

Chris Sinsigalli is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 05-15-2018, 07:27 PM
Senior Member
 
Join Date: Sep 2011
Posts: 26,146
View Steve Neul's Photo Album My Photos
It looks more like a problem with the trim shrinking than warpage. In any case treated wood comes from the factory dripping wet so it should be dried before using it. It would also help if you would run grain perpendicular in direction than the post. The wood won't shrink very much lengthwise.
Steve Neul is offline  
post #3 of 8 Old 05-15-2018, 07:38 PM Thread Starter
Junior Member
 
Join Date: Dec 2016
Posts: 3
View Chris Sinsigalli's Photo Album My Photos
ok good to know about the grain direction. You're right, it is shrinking rather than warping (to an extent). It goes back and forth though, pretty quickly too. You can almost see it before your eyes...like an alien breathing, lol.
Chris Sinsigalli is offline  
Sponsored Links
Advertisement
 
post #4 of 8 Old 05-15-2018, 08:19 PM
Senior Member
 
Join Date: Mar 2015
Location: Garland, TX
Posts: 4,232
View Toolman50's Photo Album My Photos
Steve has already addressed the shrinkage we expect from TL. When wrapping a post, you need dry lumber that is sized. For deck boards, railing and trim we also know screws offer more holding power than nails. For trim boards, finish screws (small headed) are preferred. All screws should be galvanized. Also caulking the seams of the trim can help keep moisture from getting between the post and the trim. If the deck will be stained or left natural you can use a clear silicon caulk.

If you don't have time to do it right the first time, when will you have time to do it over?
Toolman50 is offline  
post #5 of 8 Old 05-15-2018, 09:38 PM
Senior Member
 
Join Date: Jan 2014
Location: On the farm in West Texas cotton country
Posts: 645
View WesTex's Photo Album My Photos
Hereís how my cedar pergola kit was wrapped. The 2x pieces were butt jointed. Instructions were to fasten together, allowing enough slack so that they could slide up & down. Works well. Itís easy to check the fasteners to make sure everything is secure. Water also drains well (on the rare occasions that we actually get some rain).

Photos:


Sent from my iPhone using Tapatalk
hawkeye10 likes this.
WesTex is offline  
post #6 of 8 Old 05-15-2018, 10:15 PM Thread Starter
Junior Member
 
Join Date: Dec 2016
Posts: 3
View Chris Sinsigalli's Photo Album My Photos
Thanks for the pictures. That's a good idea. I think that simple screw joint you did is probably the strongest....way better than my mitered corners.
Chris Sinsigalli is offline  
post #7 of 8 Old 05-15-2018, 10:21 PM
Senior Member
 
Join Date: Jul 2008
Location: Florida Panhandle
Posts: 12,505
View GeorgeC's Photo Album My Photos
Quote:
Originally Posted by WesTex View Post
Hereís how my cedar pergola kit was wrapped. The 2x pieces were butt jointed. Instructions were to fasten together, allowing enough slack so that they could slide up & down. Works well. Itís easy to check the fasteners to make sure everything is secure. Water also drains well (on the rare occasions that we actually get some rain).

Photos:


Sent from my iPhone using Tapatalk

Hello. You in the dry land or irrigated cotton country?


George
GeorgeC is offline  
post #8 of 8 Old 05-16-2018, 11:09 AM
Senior Member
 
Join Date: Jan 2014
Location: On the farm in West Texas cotton country
Posts: 645
View WesTex's Photo Album My Photos
When I got here some 40-odd years ago it was all dryland. Now pivot systems have increased so much that I believe 1/2 or maybe more is irrigated.

Here is how my homeplace looked this morning after last nightís storms:


Sent from my iPhone using Tapatalk
WesTex is offline  
Reply

Tags
pergola base, pressure treated, warping

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Hi Folks I'm Searching For Advice Salty Dog General Woodworking Discussion 10 04-06-2018 08:02 PM
Cupped outdoor table top...looking for advice Reclaimed Treasures General Woodworking Discussion 7 06-27-2017 01:24 PM
Advice for cabinet? bengoldberg General Woodworking Discussion 3 06-09-2017 10:50 AM
8ft x 4ft farmhouse table advice charisk Joinery 4 04-05-2016 12:16 PM
Rustic dining table advice rookiewoodworker General Woodworking Discussion 18 09-19-2015 10:42 AM

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome