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Submit product literature, unit shop drawings, certification, test reports and full size sample(s) of each color selected.
All high density pre-finished concrete masonry units shall be Cordova Stone™ masonry units manufactured by Northfield Block Company. All units shall conform to ASTM C90 - current edition and shall have either a ROCKFACE, GROUNDFACE, TEXTUREFACE or CHISELFACE finish as shown on the drawings.
Field Constructed Mock-up: Construct a sample panel, no less than 4’ x 4’, of units of each color and size to be used in the project. The cleaning agent and method should also be determined and applied at the time the sample panel is constructed.
Cordova Stone™ units shall be delivered to the jobsite banded on wood pallets. Each exposed ground face shall be protected by a plastic protective layer. Each edge of the cube shall be protected by a pre-molded edge protector. Each cube shall be covered with a clear plastic wrap. Pallets should be stored in single stacks on level ground and covered with a waterproof covering (e.g., tarpaulins) to protect the units from inclement weather. Units must be handled carefully to avoid breakage and damage to the finished surfaces.
Cover walls each day after installation to keep open walls protected and dry.
PRODUCT NAME Cordova Stone™ Masonry Units
Northfield Block Company (800) 358-3003
3400 E. Bungalow Road, Morris, IL 60450
Lay units using the best concrete masonry practices. Install only quality units; reject all defective units. Align units level, plumb, and true with uniform, carefully tooled 3/8” wide joints on the finished side of the wall. Draw blocks from two or more pallets at a time during installation. Use a water repellent mortar additive, following the manufacturer’s instructions, for all exterior walls.
Lighting: Provide adequate lighting for masonry work by placing all lighting a reasonable distance from the wall for even illumination. DO NOT USE TROUGH LIGHTING.
Cutting: Make all unit cuts, including those for bonding, holes, boxes, etc., with motor-driven masonry saws, using either an abrasive or diamond blade. Cut neatly for best appearance.
The facing shall be free from chips, cracks, crazes or any other imperfection that would detract from the overall appearance of the finished wall when viewed from a distance of fifteen (15) feet at right angles to the wall under diffused lighting.
Install flashing at locations shown in the plans and in strict accordance with the details and the best masonry flashing practices.
Install weep holes and vents at proper intervals (24” O.C.) at courses above grade, above flashing, and at any water stops (24” O.C.) over windows, doors and beams.
Keep walls clean daily during installation using brushes, rags and burlap squares. Do not allow excess mortar lumps or smears to harden on the finished surfaces. Remove green mortar with burlap or a dry cloth. Harsh cleaning methods after walls have been erected may mar the surface of the units.
No acid or acid-based solutions shall be used in the cleaning of Cordova Stone™ units. A detergent masonry cleaner shall be used following the manufacturer’s instructions and the surface shall be thoroughly rinsed with clean water.
Cordova Stone™ units, when properly installed and cleaned, need virtually no maintenance other than routine cleaning with standard commercial grade cleaning agents. Graffiti, paint or dye stains may need special cleaning methods and products. Contact EchelonMasonry.com for specific cleaning recommendations.
Cavity wall construction is recommended for exterior walls, with proper flashing, venting and weep holes. A complementary or matching mortar color is recommended when using Cordova Stone™ units. A water repellent mortar additive is highly recommended for all exterior walls. Control joint spacing should be approximately 20’-25’ maximum. Located at approximately 4’ from corners, all inside corners, at wall piers at a window or large openings. Continuous horizontal joint reinforcement is recommended in the exterior wythe every 16” or every course with 12” and 16” high units.
The facing is not intended for use as an impervious surface. Acid solutions should not be used as a cleaning agent or in direct contact with the facing.Back