i have a box rail with pvc on it i made this summer. ive heard that when its cold out the pvc can crack/chip/break when you land on it. i kind of doubt it but just want to make sure so i dont fuck up the rails or myself
i have pvc rails and they chip a little bit, no cracks if you have good supports. when i say the chip, its the end that gets worn down, not like huge chunks falling off. you will be fine
THE ONLY REASON PVC WILL CRACK IS FROM IMPACT. PERIOD. I have gone threw four pieces of PVC mainly from 270s on so much that it cracked the pvc and catching tips on the end of the rail making large holes in the pvc where I drilled threw to put in the screws. you shouldn't have any problems! PVC RULES!
From my experience, only small diameter pvc has cracked/broken before. If your piping is one inch diameter or larger it should be just fine. Also, thickness helps prevent cracks