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Dufferin Stone Product Specification

Download Dufferin Stone Masonry Unit Product Specifications



Submit product literature, unit shop drawings, certification, test reports, full size sample(s) of each color selected.


All high density concrete masonry units shall be Dufferin® Stone masonry units manufactured by an Oldcastle® Company. All units shall conform to ASTM C1634 and shall have a range of colors as specified.

Field Constructed Mock-up: Construct a sample panel, no less than 4’ x 4’, of units of the color to be used in the project. The cleaning agent and method should also be determined and applied at the same time the sample panel is constructed.


Concrete Stone Masonry Veneer: Dufferin® Stone masonry units as manufactured and distributed by Oldcastle® Companies. Solid units with physical dimensions and characteristics conforming to ASTM C1634, current edition.

Color: Minimum of three variegated color blending as selected from manufacturer’s standard selections.

Size: 4” in width nominal with face dimensions selected from a minimum of 15 face sizes to match ashlar pattern indicated on drawings or established in the approved mock-up.

Anchors: Provide anchors to suit design requirements for material and installation requirements.

Mortar Materials: Provide mortar to suit design requirements for material and installation requirements.


Cover walls each day after installation to keep open walls protected and dry.



Dufferin® Stone Masonry Units


Oldcastle Architectural
501 Patetown Road, Goldsboro, NC 27530
(919) 734-1601



Coursings: Install masonry construction anchored solidly to backing, properly aligned, plumb and true in required layout, making straight, level courses, unless otherwise indicated. Place varying size of stones to provide a random ashlar pattern as approved. Maintain mortar joint thickness of 3/8” (10mm) to 3/4” (19mm) either horizontally or vertically. Tool joints as follows:
a. Flush
b. Concave
c. Recessed

Placing and Bonding: Lay masonry in full bed of mortar with full head joints, properly jointed with other work. Buttering corners of joints, deep or excessive furrowing of mortar joints is not permitted. Back-bevel bed joints to remove excess mortar droppings in cavity as work progresses. Fully bond intersections and external corners. Isolate masonry partitions from vertical structural framing members with a control joint as indicated. Provide for expansion and control joints as indicated on the drawings. DO NOT adjust masonry units after placing. Where resetting of masonry is required, remove, clean units, and place in new mortar. Leave joints under shelf angles and elsewhere as indicated or required open to receive sealant.

Anchors: Provide anchors to suit design requirements indicated or required.

Masonry backing: Wire anchors or adjustable anchors. Minimum spacing 18” (450 mm) horizontally and 32” (800 mm) vertically.

Steel stud backing: Adjustable anchors attached with corrosion-resistant screws having a minimum nominal shank diameter of 0.19” (4.8 mm). Minimum spacing 18” (450 mm) horizontally and 32” (800 mm) vertically.

Wood stud backing: Corrugated sheet metal anchors, wire anchors or adjustable anchors. Attach to backing with a corrosion-resistant 8d common nail, or a fastener with equivalent or greater pullout strength. Minimum spacing 18” (450 mm) horizontally and 32” (800 mm) vertically. Increase quantity of wall ties around perimeter of openings, at wall terminations and corners, and along parapet walls, placed within 8” (203 mm) of openings and edges of masonry. Built-in items furnished by other trades, and leave accurate openings necessary for subsequent installation of other work to maintain required strength and appearance of masonry construction. Fill solidly with mortar around conduit and sleeves passing through masonry work. Build-in loose steel angle lintels, providing bearing indicated in full mortar bed. Prevent grout, mortar, and soil from staining face of masonry. Remove grout and mortar from these surfaces immediately. Protect base of masonry walls from rain splashed mud and mortar splatters. Install weep holes in veneer masonry at maximum 24” (610 mm) on center horizontally above through-wall flashing, above shelf angles, lintels, bottom of walls, and elsewhere as indicated on drawings. DO NOT permit mortar to drop or accumulate into cavity air space or to plug weeps.


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 (32” O.C.) at courses above grade, above flashing, and at any water stops (32” 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 BASE solutions shall be used in the cleaning of Dufferin® Stone masonry units. A detergent masonry cleaner shall be used following the manufacturer’s instructions and the surface shall be thoroughly rinsed with clean water.


Dufferin® Stone masonry 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. Visit EchelonMasonry.com for specific cleaning recommendations.


Cavity wall construction is recommended for exterior walls, with proper flashing, venting and weep holes. A complimentary or matching mortar color is recommended when using Dufferin® Stone masonry units. A water repellent mortar additive is highly recommended for all exterior walls. Control joint spacing should be approximately 20’ - 25’ max. and located at inside corners, 2-4’ from outside corners, wall height changes and at one or both sides of windows or large openings.


The facing is not intended for use as an impervious surface. Muriatic acid SHOULD NOT BE USED as a cleaning agent or in direct contact with the facing. The facing should not be continuously exposed to temperatures above 250° F.

Download a printable version of these specifications.