Thank you for your question. The amount of concrete you'd need to fill a 8 in. x 48 in. tube would depend some other factors, including the depth of you'd be filling the tube to. Oldcastle strives to provide the best possible products and customer experience, so please contact us at 1-866-256-7404 so we may gather more information and resolve to your satisfaction.
Any or all of the tube can be above or below ground level. The tube is cardboard that will rot and disintegrate over time, leaving the concrete.
Hello, for an 8" diameter and 4 feet high you need .052 cubic Yards which is equivalent to 3.1 60 lb bags or 2.32 80 lb bags. For the 8 feet high you need 6.19 60 lb bags or 4.64 80 lb bags.
You can leave it or remove its just anesthetics you can just peel down to below grade, I just set mine so they were below grade, of course if your pouring piers you probably won't have that option.
I think so but it only comes in 12' lengths.
You will have to go to the ProDesk and special order that size.
Go online and look for a site that can give load calculations for a footer. Width and depth is all depending on the weight you load on it.
More details needed for a proper answer. If these are fence posts you will want to bury Part of them underground , 2 feet (24”) in my area. The walls of the hole in the ground will negate the need for the form tube. Form tubes are designed to support weight straight down. A fence needs lateral support ( side to side ; front to back . Getting part of the post anchored under ground is the goal. Also , check instructions on your posts. Some vinyl posts (hollow)are designed to slide down over pressure treated wooden posts. Good luck!
You should use whatever your local building code dictates.
You should only need one tube. You can cut it to whatever length you wish all it does is hold the concrete in that shape. After concrete is set up you can cut the cardboard that is above ground and remove it. But make sure you get the air bubbles out while the concrete is still wet or it will look ugly!