Foundation Dowel Spacing

MSJC building code requires reinforcing bars to be properly lapped, but this includes noncontact lap splices.

MSJC  Code 2.1.7.7.1.3 Bars spliced by noncontact lap splices shall not be spaced transversely farther apart than one-fifth the required length of lap nor more than 8 in.” 

MSJC Commentary 2.1.7.7.1.3 If individual bars in noncontact lap splices are too widely spaced, an unreinforced section is created, which forces a potential crack to follow a zigzag line. Lap splices may occur with the bars in adjacent grouted cells if the requirements of this section are met. 

Foundation dowels are often GOOSE-NECKED to shift to another cell.  

THIS IS NOT TYPICALLY NECESSARY HOWEVER.  Noncontact lap splices are permitted. 

The specifications also limit the amount a bar can be bent to 1:6 (Foundation dowels that interfere with unit webs

are permitted to be bent to a maximum of 1 in. horizontally for every 6 in. of vertical height). 

Commentary 3.4 B.11 (d) Misaligned foundation dowels may interfere with placement of the masonry units. Interfering dowels may be bent in accordance with this provision. Removing a portion of the web to better accommodate the dowel may also be acceptable as long as the dowel is fully encapsulated in grout and masonry cover is maintained. 

By using knockout units upside down, cutting out webs, and/or using noncontact lap splices, little bar bending is necessary even if dowels are in a different cell. 1/5 of 40” LAP = 8” maximum offset. 

Let’s not make masonry construction any more difficult than it needs to be!!

Respectfully submitted,
DGM Consultants, PA