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Masonry Veneer Systems
Adhered Stone Veneer Systems
(This Section Also Includes Anchored Cut Stone And Rubble Stone)
1) General
2) Details
3) Guide Specifications 04456
4) Guide Specifications 04457
1. General
UBC Sec. 3005
Consideration shall be given for differential movement of supports, including that caused by temperature changes, shrinkage, creep and deflection.
(b) Adhered veneer. With the exception of ceramic tile, adhered veneer and its backing shall be designed to have a bond to the supporting element sufficient to withstand a shearing stress of 50 pounds per square inch.
(c) Anchored veneer. Anchored veneer and its attachments shall be designed to resist a horizontal force equal to twice the weight of the veneer.
Adhered Veneer
Sec. 3005. (a) Permitted backing. Backing shall be continuous and may be of any material permitted by this code. It shall have surfaces prepared to secure and support the imposed loads of veneer.
Exterior veneer, including its backing, shall provide a weatherproof covering.
For additional backing requirements, see Sections 1707(a) and 510(b).
(b) Area limitations. The height and length of veneered areas shall be unlimited except as required to control expansion and contraction and as limited by Section 3001 (b).
(c) Unit size limitations. Veneer units shall not exceed 36 inches in the greatest dimension nor more than 720 square inches in total area and shall weigh not more than 15 pounds per square foot unless approved by the building official.
EXCEPTION: Veneer units weighing less than 3 pounds per square foot shall not be limited in dimension or area.
Adhered Stone Veneer Installation
(d) Application. In lieu of the design required by Sections 3004 (a) and (b) adhered veneer may be applied by one of the following application methods:
1. A paste of neat portland cement shall be brushed on the backing and the back of the veneer unit. Type S mortar then shall be applied to the backing and the veneer unit. Sufficient mortar shall be used to create a slight excess to be forced out the edges of the units. The units shall be tapped into place so as to completely fill the space between the units and the backing. The resulting thickness of mortar in back of the units shall be not less than 1/2 inch nor more than 1-1/4 inch.
2. Units of tile, masonry, stone or terra cotta, not over 1 inch in thickness shall be restricted to 81 square inches in area unless the back side of each unit is ground or box screeded to true up any deviations from plane. These units and glass mosaic units of tile not over 2 inches by 2 inches by 3/8-inch in size may be adhered by means of portland cement. Backing may be of masonry, concrete or portland cement plaster on metal lath. Metal lath shall be fastened to the supports in accordance with the requirements of Chapter 47. Mortar as described in Table No. 30-A shall be applied to the backing as a setting bed. The setting bed shall be a minimum of 3/8-inch thick. A paste of neat portland cement or half portland cement and half graded sand shall be applied to the back of the exterior veneer units and to the setting bed and the veneer pressed and tapped into place to provide complete coverage between the mortar bed and veneer unit. A portland cement grout shall be used to point the veneer.
Reproduced From The Uniform Building Code, with Permission of the publisher, The International Conference Of Building Officials.
2. Details
Adhered Veneer Diagram
The NW Masonry Guide Table of Contents
Masonry Institute of Washington
Washington State Conference of Mason Contractors
