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This presentation addresses the proper application of empirical crack control measures into concrete masonry wall systems as presented in NCMA TEK 10-2C. It includes causes of cracking, use of control joints and horizontal reinforcement to minimize cracking, details and banding (mixing courses of clay and concrete masonry).

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Tek 10-2c

Clay brick masonry expansion joint spacing, placement, and size are required to comply with BIA Technical Notes 18 and 18A. j. The lateral deflection for framing supported brick veneer is required to be limited to L/600. k.

This presentation addresses the proper application of empirical crack control measures into concrete masonry wall systems as presented in NCMA TEK 10-2C. It includes causes of cracking, use of control joints and horizontal reinforcement to minimize cracking, details and banding (mixing courses of clay and concrete masonry). Thursday, April 8

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TEK 10-1a, Crack Control in Concrete Masonry Walls TEK 10-2c, Control Joints for Concrete Masonry Walls – Empirical Method TEK10-3, Control Joints for Concrete Masonry Walls - Alternative Engineered Method Engineers are encouraged to study these documents for developing a layout for the movement joints using Hi-R and Hi-R H systems.

It also recommends that joints be located at areas of stress concentrations, such as changes in wall height or thickness or near wall openings or corners. TSD224 TECHNICAL SERVICES DIGEST July 2015 SUBJECT: Control Joints vs Expansion Joints This TSD is designed to explain the difference and the general rules for using Control Joints and Ex- [2] NCMA TEK 10-2C, Control Joints for Concrete Masonry Walls – Empirical Method, 2010 and NCMA TEK Note 10- 10-4, Crack Control for Concrete Brick and Other Concrete Masonry Veneers, 2001. The decision to utilize this information is not within the purview of the MIM, and persons making use of this information do so at their own risk. Per NCMA Tek Note 10-2C and 10-4, proper control joint spacing is required for all concrete masonry walls. D. Control Joint Placement: Locate control joints where volume changes in the masonry due to drying shrinkage, carbonation, or temperature changes are likely to create tension in the masonry that will exceed its capacity. 2019-03-07 Empirical Method, NCMA TEK 10-2C Distance between joints not to exceed lesser of Length to height ratio or ft 1 ½ : 1 25 • Minimum horizontal reinforcement of 0.025 in2/ft. • W1.7 (9 gage) joint reinforcement at 16 in.

(12 ft.) TEK 10-2C contains additional control joint construc-tions/details that can also be used on diaphragm walls, including fire-rated joints and control joints that allow shear transfer. SUMMARY Diaphragm walls provide several benefi-cial features and are applicable to a wide variety of projects. Constructing reinforced concrete Table 1 from NCMA TEK Note 10-2C describing recommended control joint spacing for typical concrete block masonry assemblies. As mentioned in the expansion joints discussion, the design of control joint spacing and location is the responsibility of the Designer. This index contains a listing of all NCMA TEK Notes with links to each document. Section 1 - Codes & Specifications 01-01F ASTM Specifications for Concrete Masonry Units TEK 10-2C contains additional control joint construc-tions/details that can also be used on diaphragm walls, including fire-rated joints and control joints that allow shear transfer. SUMMARY Diaphragm walls provide several benefi-cial features and are applicable to a wide variety of projects.
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Again, Show And Dimension The Location Of Vertical Joints On An Elevation View As Well As A Sketch Of The Joint Detail Assume That The NCMA TEK 10-2C and 10-3 provide design guidance for movement joint placement and spacing; the code does not give specific recommendations. Typically, CMU movement (control) joints will be spaced between 20 feet and 25 feet on center. NCMA TEK 14-3A gives some guidance on horizontal spanning walls and pilasters (looks like it is based on unreinforced walls though) and TEK 10-2C gives guidance on control joints and shear transfer with details:

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Empirical Method, NCMA TEK 10-2C Distance between joints not to exceed lesser of Length to height ratio or ft 1 ½ : 1 25 • Minimum horizontal reinforcement of 0.025 in2/ft. • W1.7 (9 gage) joint reinforcement at 16 in. Control Joint Spacing: Empirical Method

ASTM C920-14a Standard Specification for Elastomeric Joint Sealants (West Conshohocken, PA: ASTM International, 2014). Empirical Method, NCMA TEK 10-2C Distance between joints not to exceed lesser of Length to height ratio or ft 1 ½ : 1 25 • Minimum horizontal reinforcement of 0.025 in2/ft.

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NCMA TEK 10-2C 3 reinforcement is placed above, below and beside the opening as discussed below. In walls containing vertical reinforcement, the cell adjacent to the opening is usually grouted and reinforced to provide solid support and additional strength for jambs. …

2C, 10-3. Page 45.