Use this CSI 3-part SimpleSpecs™ master specification to specify natural cut stone used typically in veneered wall applications.
This section also includes flashings, weeps, mortar-dropping control, and other accessories required for stone installation.
Cut stone is often used in veneered applications but can also be used as load-bearing and non-load-bearing walls and as slabs for assemblies such as benches, steps, and other non-load-bearing uses.
Stone 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 can be used to secure veneer to the backup construction, to allow for differential movement, however fixed anchors can also be used which typically consist of edge anchors that grasp slots routed into the edge of the stone or dowels drilled into the back of the stone.
What is efflorescence?
Some stone, particularly porous stone such as limestone and sandstone are 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.
Related Industry Association:
Related SimpleSpecs™ master specifications: