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Old 03-08-2011, 07:16 PM   #1
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Door trim miter

I had the trim on my exterior back door replaced with a composite, vinyl type trim instead of wood because the old trim was rotting at the bottom. It looked good until the one miter corner started to open up recently. Originally, there was a very small gap that was caulked. I am thinking water got in, expanded with the combination weather we had, cracked the caulk and separated the joint. I could see the nail going from the top piece into the side piece was popping out of the top and I don't see a nail going from the side piece into the top piece like I assume there should be. Attached are photos of the door, the one miter that is still good and then the one with the gap. How do I fix it? Renail it with new nail? What type? Use existing nail or hole? Pre drill pilot holes if new nail is used? Wood screw? I want to bring the joint back together and secure it so it doesn't open up again, but don't know best way. I am no carpenter or handyman (obviously, or wouldn't need the advice!). Thanks.
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Last edited by Slyguysmoke; 03-08-2011 at 07:20 PM.
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Old 03-08-2011, 07:37 PM   #2
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Door trim miter

The miters should have been made with PVC cement to fuse the material together. Thermal expansion is an issue with all vinyl (PVC) products. Without cementing those joints, they will always have a tendancy to move.

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Old 03-08-2011, 07:43 PM   #3
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Door trim miter

So should I try to squeeze the miter together with a miter clamp and cement it? If that's even possible, do I then nail it?
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