Window and Door Layout

The mason must note the exact location of all windows and doors.

Prior to First CourseThe window and door opening widths and heights are written directly on the concrete slab. The window sill height is also noted so that the masonry crew knows at what height to start the window sill. When the mason is laying out all of the openings, he can verify the accuracy of the vertical rebar and make the necessary corrections at that time.

The photo above depicts a door opening of 40”. Notice that the door opening does not match the previously poured slab door opening. The right blue mark shows where the actual door jamb will be, therefore the blue “R” denotes that a rebar dowel will have to be added by drilling 8” into the concrete, injecting epoxy and then the rebar dowel.

The photo above depicts the field notation on the slab where a 4‘0 x 6‘0” window is located and an exterior electrical box. As the first or second course of block is placed, it is a practical idea to transfer what has been noted on the concrete slab and transfer that information onto the wall. Transferring this information helps avoid mistakes and omissions.

The photo below depicts the size and location of a 29 3/4” wide x 3’ 11 3/4” high window. This window is no doubt an aluminum clad wood window that is going to require some cutting of block to accommodate the non-block module sizing. The sill height is 4’0”. Notice how the Omni Block Corner units are used from the first course and above.