Stone Inspection Information and Procedure
Adhered Concrete Masonry Veneer (ACMV), or Adhered Stone Veneer (ASV), often called cultured stone has been around for several decades now. It started being really popular in the early 2000s and continues to be a very popular choice of building materials for new construction to add a touch of class and upgrades to the home's curb appeal and appearance. It looks nice, it's light, is not super expensive like real stone, is pretty easy to install, so it's a great thing right? Yes, it is a great thing, HOWEVER, most stone veneer is installed incorrectly. After inspecting hundreds of stone installation, it's obvious that the industry best practices often get overlooked or ignored.
There is a stone veneer industry guide published and updated regularly by the National Concrete Masonry Association (NCMA) that details the best practices and correct installation of stone veneer. The most current version (5th Edition) is published and available for download from this page: National Concrete Masonry Association Guides and Manuals page. The direct link to the stone veneer installers guide PDF file is available here: MVMA Installation Guide.
These installation guidelines are the standards that we inspect to. The vast majority of new and existing installations we inspect are incorrectly installed per industry guidelines. Keep in mind, however, that older installations may not have had as much guidance and installation requirements as they do today, so the best we can do with older installations is to look at issues that are definitely a problem, or a potential future problem, which are currently or may result in moisture issues with the structure. New and recent installations within recent years should adhere to the published industry guidelines unless there is something in the manufacturer's installation instructions that indicate otherwise.
When inspecting stone veneer installations, the most common deficiencies we note are lacking proper clearance from grade or hardscape (sidewalks, patios, driveways), no weep screed at the base of the assembly, lacking or improper flashing, no casement and sealant bead at transitions from stone to other materials such as door jambs, window trim, and siding. As with all wall cladding, the most common areas for water intrusion is at penetrations through the wall such as windows, doors, and utility penetrations like hose bibs, lights, etc. Penetrations lacking proper clearance, flashing, and sealant can result in water penetration, mold and rot of the wall structure, and costly repairs.
First, a visual inspection is conducted and any deficiencies are documented. Critical areas and any areas having visual indications of moisture intrusion are identified for measurement.
It is impossible to determine the condition of the wall sheathing under the stone without inserting moisture probes and taking moisture measurements. Under critical areas such as windows and kickout flashings where the roof and wall meet, two small 3/16 inch holes are drilled, moisture probes are inserted to measure moisture content in the wall sheathing, the sheathing is probed to determine if softness exists, and the holes are filled with silicone closely matching the color of the mortar.
Measurement locations are documented and a detailed report will be produced and delivered.
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