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EFFECTIVE COMPRESSION AND SHEAR AREAS FOR GROUTED MASONRY UNITS



The effective area of hollow masonry used in design vary and are generally dependent upon the thickness of the face shells and the cross-webs, the width of grouted core, and the type of mortar bedding used in construction. Since contractors may use standard two-hole (plain or concave ends) or open-end concrete masonry units, and since exact configuration may vary between manufacturers, the precise effective area will be unknown at the time of design. Effective areas for masonry walls loaded in compression or in shear parallel to the wall are given in the table below. Adjustments need to be made to reflect loss of area resulting from the use of reglets, flashing, slip-joints, and raked mortar joints. Values provided are in² per linear foot.

Spacing of Grouted Cells	Nominal Wall Thickness
	6	8	10	12
Fully Grouted	68	92	116	140
16	44	59	72	85
24	38	49	59	68
32	34	44	52	60
40	32	42	48	55
48	31	40	46	52
56	30	38	44	50
64	29	37	43	48
72	28	36	42	47
No Grout	24	30	33	36

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