vinyl brick mold

[Salty]

Too hot here too guys. But if I work in the mornings I can get a few things done.
Anyway, has anyone here used vinyl brick mold and lives in a hot/cold extreme climate?
This morning I installed the used door from the house into the garage. The old one had rotted at the bottom of the frame. Frame and door went in fine but now I need to replace the brick mold.
I was reading an article that stated that a 12 foot piece of vinyl can change in length by as much a 3/4" due to expansion and contraction.
Considering the vertical pieces of a doorway, this 7 foot piece could expand as much as 7/16" over its length. No need to worry much about the bottom but how about the miter joint. If I install it say this Tuesday when the temp is around 96 degrees F, will that joint open up in mid January by over 1/8"?
That would look ugly!
And apparently you have to make sure you use a good flexible caulk so that the seal can flex with the vinyl.
I'm going to stop at the local lumber store tomorrow and check the price of this stuff compared to the regular brick mold. That may be the determining factor if it is too costly.
What I need is some made from treated wood.

[crokett]

Can't say for brick mold but I have some plastic trim around my french door - installed it instead of wood cause I didn't want it to rot and I never wanted to paint it. As far as I know it is vinyl but it hasn't moved at all since it was installed. It is more stable than the wood trim that is around the door into my shop.

[parnelli]

It was about 40 degrees when I installed it around a patio door last year, and it was 98 out today. I notice no difference at all in the tightness of the joints, nor did I over the winter when it was zero.

I hadn't thought much about expansion/contraction when I installed it, and it certainly makes good sense- but it doesn't seem to translate into actual use somehow.

[WayneJ]

I watched a TOH show where Tom Silva was using it . He was glueing the mitered joints with PVC glue. I beleve the show was from Mass.
Wayne

[lkazista]

Like Wayne said, if you use PVC glue on the miters, then they will never seperate.

Go vinyl, who wants to repaint a door every coupl of years.

Lee

[Salty]

Thanks all. I hadn't considered gluing the joints. I was just concerned about them separating.
I suppose adding screws to hold the corners together while the glue dries would be in order as well.

[WayneJ]

I don't think you will need screws to hold the joint together. The pvc glue will dry in about 5 seconds. If you want to use them thats your call.
Wayne