04 22 00 Concrete Unit Masonry

04 22 00 Concrete Unit Masonry

Specification Details




8.5" x 11"


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04 22 00

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Concrete Unit Masonry

Use this CSI 3 part SimpleSpecs™ master specification to specify concrete unit masonry construction, either load-bearing, non-load-bearing, or veneered applications.


Concrete masonry is composed of Portland cement, aggregate, water and possibly additives that improve the properties of the masonry, including lowering water absorption. Concrete masonry can be used in load-bearing, non-load-bearing, and veneered assemblies. Exposed faces can be standard smooth finish or custom finishes such as split or ground face or glazed.


Load-bearing and non-load-bearing concrete masonry typically include both horizontal and vertical reinforcing. Since it does not typically include a weep drainage network it can be susceptible to moisture infiltration when exposed to the weather.


Masonry veneer may be placed over other masonry backup or over the exterior sheathing. This type of masonry construction allows for the installation of a weep drainage system consisting of a weather barrier placed on the backup or sheathing, an air space, base flashings, and weeps. A cavity mesh should be used to prevent mortar from clogging the weeps. Flexible ties should be used to secure veneer to the backup construction, to allow for differential movement.


Most concrete masonry is susceptible to efflorescence, a condition in which moisture that enters the masonry is drawn to the exterior surface upon evaporation, bringing salts that exist within the masonry to the surface, where they are deposited as a white powder. Efflorescence can be easily removed using a specialty cleaner if caught early. Efflorescence tends to decrease over time as the salts decrease and shows up worse on darker surfaces.


For assistance in selecting and detailing concrete masonry, visit the National Concrete Masonry Association (NCMA) Tek Solutions Center at www.ncma.org.


Related SimpleSpecs™ master specifications:

04 03 01 – Masonry Cleaning

04 05 13 – Masonry Mortaring 

04 05 16 – Masonry Grouting

04 21 13 – Brick Unit Masonry

04 23 00 – Glass Unit Masonry

07 16 16 – Crystalline Waterproofing 

07 17 00 – Bentonite Waterproofing 




Concrete Unit Masonry





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