We have been asked to install an 8' x 8' door in a warehouse. The walls are concrete blocks stacked one above the other (not staggerd like bricks). The walls are aproximately 20' high and the trusses are about six feet apart. Our concern is if we cut through the wall, do we require a header or some other support for the above cement wall? There is a man door at the spot where the new door is to be installed and it appears as if it has some structural frame work. Is a header required or is there an alternative? If a header is suggested, how best to install it into the concrete blocks?
Sorry, no pictures.