Miter PVC/wood? - Carpentry - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Carpentry

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

Like Tree8Likes
  • 2 Post By XSleeper
  • 1 Post By Canarywood1
  • 1 Post By XSleeper
  • 1 Post By ChuckF.
  • 1 Post By sixeightten
  • 1 Post By JIMMIEM
  • 1 Post By lenaitch
Reply
 
Thread Tools Search this Thread
Display Modes
Old 08-18-2017, 05:41 PM   #1
Member
 
Join Date: Jul 2008
Location: Chicagoland
Posts: 205
Rewards Points: 203
Default

Miter PVC/wood?


I am replacing the trim around my garage door. It was suggested by a big box guy that use PVC wood or whatever they call it. I could not get in in a 16' length so I will have to piece together a few lengths of it to cover the top. I was thinking about mitering it to get a better look but I recently read that wood used outside shouldn't be mitered because of climate effects. But this isn't exactly wood...is it? I was not planning to miter the side pieces. There isn't a whole lot on google about garage door trim it that I could find! Maybe I'm overthinking this.

Any tips would be appreciated.
Hurriken is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-18-2017, 05:55 PM   #2
Member
 
Join Date: Sep 2007
Location: Nebraska
Posts: 1,300
Rewards Points: 477
Default

Re: Miter PVC/wood?


When using pvc trim in residential construction, we often use a white pvc epoxy to glue corners and scarf joints together. But that product is not readily available for diyers. You could try PC-11 epoxy, a 2 part mix.

You should miter your corners and scarf any lap joints. Use 2 3/4" t-20 (torx) composite deck screws to attach it. JB water weld putty works well to fill nail holes... or use more PC-11 or Glaziers putty if you like.
Hurriken and lenaitch like this.
XSleeper is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-18-2017, 06:23 PM   #3
Member
 
Join Date: May 2012
Location: Sarasota,Florida
Posts: 4,070
Rewards Points: 1,042
Default

Re: Miter PVC/wood?


"but I recently read that wood used outside shouldn't be mitered because of climate effects."

Well your not going to be working with wood, PVC trim is a molded cellular product, so miter away.
Hurriken likes this.
Canarywood1 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-18-2017, 07:12 PM   #4
Member
 
Join Date: Jul 2008
Location: Chicagoland
Posts: 205
Rewards Points: 203
Default

Re: Miter PVC/wood?


Ok Thanks, good info. Except I don't know what a lap joint is and how to scarf it. Google here I come!
Hurriken is offline   Reply With Quote
Old 08-18-2017, 07:25 PM   #5
Member
 
Join Date: Sep 2007
Location: Nebraska
Posts: 1,300
Rewards Points: 477
Default

Re: Miter PVC/wood?


I was referring to a plain scarf joint like this...

http://cf.ydcdn.net/1.0.1.80/images/main/A5scarf2.jpg

(Top image)
Hurriken likes this.
XSleeper is offline   Reply With Quote
Old 08-18-2017, 08:07 PM   #6
Member
 
Join Date: Aug 2013
Location: North Georgia
Posts: 1,978
Rewards Points: 1,956
Default

Re: Miter PVC/wood?


"I recently read that wood used outside shouldn't be mitered because of climate effects."

True, that's because wood expands and contracts at a different rate in length vs width, so a miter joint outdoors will open and close as humidity varies. Solid PVC does not have that problem.
Hurriken likes this.
ChuckF. is offline   Reply With Quote
Old 08-18-2017, 08:22 PM   #7
Member
 
Join Date: Sep 2007
Location: Nebraska
Posts: 1,300
Rewards Points: 477
Default

Re: Miter PVC/wood?


I don't think that is a hard/fast rule. It would be silly and unrealistic to think that it is. There are many places where wood gets mitered outside. #908 brickmould around a window, for example... or any other moulding with a profile HAS to be mitered.

Good carpentry techniques, backpriming, and continued maintenance (to keep water out) all contribute to mitered joints that last.
XSleeper is offline   Reply With Quote
Old 08-18-2017, 10:08 PM   #8
Framing Contractor
 
Join Date: Feb 2009
Location: NE Ohio
Posts: 1,440
Rewards Points: 346
Default

Re: Miter PVC/wood?


Any lumber yard near you will have the pvc in 18' lengths. No need to scarf if you don't have to.
woodworkbykirk likes this.
sixeightten is offline   Reply With Quote
Old 08-19-2017, 12:39 PM   #9
Member
 
Join Date: Jul 2008
Location: Chicagoland
Posts: 205
Rewards Points: 203
Default

Re: Miter PVC/wood?


I really stink at Miters. Anybody in the market for scrap PVC!

I'll never get better without practice though. I'll let you know how it goes.
Hurriken is offline   Reply With Quote
Old 08-19-2017, 05:14 PM   #10
Member
 
Join Date: Nov 2016
Location: Massachusetts
Posts: 496
Rewards Points: 992
Default

Re: Miter PVC/wood?


Quote:
Originally Posted by Hurriken View Post
I really stink at Miters. Anybody in the market for scrap PVC!

I'll never get better without practice though. I'll let you know how it goes.
What tool were you planning on using to cut the miters? A power miter saw would be quickest and easiest....a manual miter box would work too. If you are going to be doing a lot of DIY work around the house a power miter box would be a good investment. Use PVC glue to put the miters together. As others have said, lumbers yards will have PVC trim stock in long lengths so you won't have to make any joints other than corner miters and butt joints.
PVC is expensive in comparison to wood so might be best to practice your cuts on the less expensive wood.
Hurriken likes this.

Last edited by JIMMIEM; 08-19-2017 at 05:16 PM. Reason: add info
JIMMIEM is offline   Reply With Quote
Old 08-19-2017, 09:02 PM   #11
journeyman carpenter
 
woodworkbykirk's Avatar
 
Join Date: Sep 2011
Location: nova scotia canada
Posts: 3,480
Rewards Points: 1,578
Default

Re: Miter PVC/wood?


big box stores only carry 8's and 12's of pvc,,, lumberyards and siding suppliers will carry 18 ft lengths of it

regarding expansion and contraction.. pvc DOES expand and contract but not do to humidity.. it expands with heat and direct sunlight and contracts in the cold.. so during the winter months mitres will open up. for this reason scarf joints arent recommended becasue they can pull apart when it gets cold when the material shrinks.. google a half lap joint it will move with the expansion and contraction of the wood.

as for adhesive.. clear pvc glue thats for plumbing joints will work, also two part adhesive such as 2p-10 or mitre pro works as well
woodworkbykirk is offline   Reply With Quote
Old 08-19-2017, 09:17 PM   #12
Member
 
Join Date: Jul 2008
Location: Chicagoland
Posts: 205
Rewards Points: 203
Default

Re: Miter PVC/wood?


I have a miter box and a power miter saw. I've done some basic stuff with them but it's different when your dealing with an imperfect corner.

I am seriously considering searching for an 18 footer. It would look cleaner as well.
Hurriken is offline   Reply With Quote
Old 08-20-2017, 06:24 AM   #13
Member
 
Join Date: Nov 2016
Location: Massachusetts
Posts: 496
Rewards Points: 992
Default

Re: Miter PVC/wood?


Quote:
Originally Posted by Hurriken View Post
I have a miter box and a power miter saw. I've done some basic stuff with them but it's different when your dealing with an imperfect corner.

I am seriously considering searching for an 18 footer. It would look cleaner as well.
Measure the actual angle of the corner. Divide the actual angle number by 2 and cut each side of your miter to this.
JIMMIEM is offline   Reply With Quote
Old 08-20-2017, 06:26 PM   #14
Usually Confused
 
lenaitch's Avatar
 
Join Date: Feb 2014
Location: Central Ontario, Canada
Posts: 6,488
Rewards Points: 116
Default

Re: Miter PVC/wood?


In addition to determining the actual angle you need to achieve, you might want to check the factory settings of your mitre saw. The owner's manual should have the procedure. Some cheaper saws can have a lot of slop in their settings and detents.

If you can't source pieces long enough for your needs, half-lap joints that aren't screwed or glued will open and close in response to the temperature. If you do your cuts and fitting on a really hot day (or on a day of direct sunlight on the surface) the joints will be nice a tight during the summer and open up in the winter, when you are less likely to be outside staring at the them.
Hurriken likes this.

Last edited by lenaitch; 08-20-2017 at 06:30 PM.
lenaitch is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Ridged Miter Saw Bevel - Can move blade for Bevel cut HTFreak Tools 4 06-16-2015 01:56 PM
Miter Saw Advice (Sliding vs. Non-sliding) theOptimizer Tools 20 01-26-2015 11:29 AM
Picture Frame with Miter Cuts wkumtrider Carpentry 11 01-19-2015 06:55 PM
My FIRST Miter Saw - Seeking Advice CaptainMarvel Tools 24 11-30-2012 11:41 AM
miter bar problem ChrisMohrSr Carpentry 2 02-06-2011 08:47 PM




Top of Page | View New Posts