The illustration at left is an example of a 4040 (4’0″ x 4’0″) rough Omni Block opening. The mason must leave the minimum call out, but many times will leave up to an additional 3/8″ due to the absence of the mortar joint within the opening.
Fiber glass, vinyl or metal windows should be ordered without fins or protruding fasteners. A nominally sized 4040 window should be ordered 3/8″ to 1/2″ undersized of the 4’0″ x 4’0″ dimension requirement.
All windows should be ordered 3/8″ to 1/2″ under the minimum rough opening call out.
Window installation suggestions are found at this LINK or the next page.
The block module opening for a 3′ 0″ door is 3′ 4″. A typical 3’0″ door with 8″ wide jambs call for a 3′ 2″ rough opening (2″ larger than the door call-out). Therefore, a 2′ 6″ door would fit into a 2′ 8″ block module opening.
The illustrations show the 3′ 4″ block opening and then below an added 2×8 wood stud (door buck) first glued with construction adhesive, then Tapcon countersunk and screwed while the adhesive is still pliable into the hinged side of the door jamb.
Door installation suggestions are found at this LINK or the next page.