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Old 06-20-2019, 10:19 AM   #16
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Re: Exterior trim warping


PT is generally bought still somewhat wet from the treatment process, that's the big reason it warps.
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Old 06-21-2019, 11:49 AM   #17
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Re: Exterior trim warping


You said you ripped your 4x6's down to some other dimension. What are the final dimensions of the trim?

How did you secure it?

All wood moves as it dries, is milled, and with seasonal changes after installation, etc.

PT lumber is practically dripping wet, and can move/warp significantly both immediately after you cut it, and as it dries.

Cedar is a good alternative to PT lumber, as it is naturally resistant to weather and rot, but it is not immune from warping as you cut it to different dimensions and comes to equilibrium with its environment (taking on moisture, or drying out)

People are asking for details on your application, and images so they can recommend an appropriate assembly that may be less susceptible to movement and be easier to work with than giant solid wood timers.
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Old 06-21-2019, 03:47 PM   #18
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Re: Exterior trim warping


I uploaded a bunch of pics to an album, but as usual I have no idea how to put them on here. They require a web address, why is there not a link button to your album folder?


It is titled French door trim or something long those lines.
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Old 06-21-2019, 03:52 PM   #19
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Re: Exterior trim warping


Quote:
Originally Posted by alexjburkhardt View Post
You said you ripped your 4x6's down to some other dimension. What are the final dimensions of the trim?



R 1 13/16 x 4 3/16
L 1.5 x 4.5
notces cut out on bottom to provide lip for track


How did you secure it?


T25 deck screws at least 3 per side



All wood moves as it dries, is milled, and with seasonal changes after installation, etc.


Agreed, wasn't expecting THIS MUCH!


PT lumber is practically dripping wet, and can move/warp significantly both immediately after you cut it, and as it dries.



I let it dry level for quite some time in the hopes to lessen warp-not enough obviously!


Cedar is a good alternative to PT lumber, as it is naturally resistant to weather and rot, but it is not immune from warping as you cut it to different dimensions and comes to equilibrium with its environment (taking on moisture, or drying out)

People are asking for details on your application, and images so they can recommend an appropriate assembly that may be less susceptible to movement and be easier to work with than giant solid wood timers.

I want to use solid as opposed to trimming out. I hope it works this time....
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Old 06-21-2019, 04:36 PM   #20
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Re: Exterior trim warping


Any reason why you couldn't just use cedar 2x6 lumber? That's 1.5" x 5.5" actual. One or two rip cuts, cut to length, and you're good. I'm also not sure why one side is 5/16" thicker than the other, unless that was the result of sawing the 4x6 in half?

https://www.homedepot.com/p/2-in-x-6...5650/300510268

Part of the problem is that you had a larger piece of timber, which was cut and dried in it's larger state, and re-sawed it into several pieces. The internal tensions of the board release, and you can end up with very unstable stock. Take into account that you're working with a long casing leg, and at 1.5" thick -- it's not the best situation to put yourself in. Pick the straightest pieces of "2-by" stock that you can find, and rip a little off each edge to get your casing legs.

Is the top header existing? did you replace that too, or just the left and right sides?
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