SPEC NOTE: This master guide specification Section is intended for use when specifying dolomitic limestone units as part of non-loadbearing masonry veneer applications.

SPEC NOTE: A Registered Specification Writer (RSW), in accordance with the standards and practices recommended by Construction Specifications Canada, has produced this master guide specification Section. It specifically uses the standardized formats MasterFormat™, SectionFormat™ and PageFormat™ to organize the information.

SPEC NOTE: Optional choices are indicated by using square brackets to surround the optional text, such as [_____]. Delete any inappropriate choices, and then remove any remaining square brackets prior to final printing. Where selection is indicated with an [OR] statement, select the appropriate paragraph and delete the inappropriate statement. Delete all SPEC NOTEs and [OR] statements prior to final printing.

SPEC NOTE: Arriscraft•SPEC is a commercially developed guide specification system. Arriscraft•SPEC Sections are intended to be used by design professionals knowledgeable in specification writing techniques and masonry construction practices. They must be edited to reflect project-specific requirements. Arriscraft accepts no responsibility or liability for the completeness and accuracy of the information contained herein, nor for the accuracy or completeness of project specifications developed using the Arriscraft•SPEC system.

1		General

1.1			SECTION INCLUDES

.1	Dolomitic limestone masonry units.

SPEC NOTE: Edit to suit project requirements.

1.2			RELATED SECTIONS

.1	Section 04 05 00 – Common Work Results for Masonry.

.2	Section 04 05 13 – Masonry Mortaring.

.3	Section 04 05 16 – Masonry Grouting.

.4	Section 04 05 19 – Masonry Anchorage and Reinforcing.

.5	Section 04 05 23 – Masonry Accessories.

.6	[Section 05 10 00 – Structural Steel Framing: loose steel lintels.]

.7	Section 07 92 00 – Joint Sealants.

SPEC NOTE: Edit the following Article in conjunction with the requirements of Part 2 – Products and Part 3 – Execution. Delete those reference standards not required by the Project. Insert the correct date for each applicable standard.

SPEC NOTE: For further information regarding the content or availability of any of these reference standards, contact the author organization, as follows:
•	American Society for Testing and Materials, www.astm.org
•	Canadian Standards Association, www.csa.ca

1.3			REFERENCES

.1	ASTM C97-[__]: Standard Test Methods for Absorption and Bulk Specific Gravity of Dimension Stone.
 
.2	ASTM C99-[__]: Standard Test Method for Modulus of Rupture of Dimension Stone.

.3	ASTM C170-[__]: Standard Test Method for Compressive Strength of Dimension Stone.

.4	ASTM C241-[__]: Standard Test Method for Abrasion Resistance of Stone Subjected to Foot Traffic.

.5	ASTM C880-[__]: Standard Test Method for Flexural Strength of Dimension Stone.

.6	ASTM C568-[__]: Standard Specification for Limestone Dimension Stone.

.7	CSA A371-[__]: Masonry Construction for Buildings.

1.4			SAMPLES

.1	Submit samples as specified in Section [01 00 00] [01 33 00] [______].

.2	Samples: [Three] [_____] full size sample, illustrating colour range and texture.

1.5			TEST REPORTS

.1	Submit test reports as specified in Section [01 00 00] [01 33 00] [______].

.2	Test Reports: Test results prepared by an independent testing agency, indicating tested material characteristics as part of a source quality control program, current within the past five (5) years.

1.6			QUALITY ASSURANCE

.1	Manufacturer Qualifications: Manufacturer having sufficient plant facilities to produce the shapes, quantities and size of Products required in accordance with the project schedule.

.2	Installer: Company or person specializing in commercial masonry work [with [_____] years [documented] experience].

.3	Mock-up: Supply sufficient quantity of full size dolomitic limestone masonry units for use in constructing mock-up panel, as specified in Section [04 05 00] [______].

1.7			DELIVERY, STORAGE AND HANDLING

.1	Refer to Section [01 00 00] [01 60 00] [______].

.2	Deliver masonry units in protective film. Prevent damage to units.

.3	Lift skids with proper and sufficiently long slings or forks with protection to prevent damage to units. Protect edges and corners.

.4	Store units in a manner designed to prevent damage and staining of units.

.5	Stack units on timbers or platforms at least 75 mm above grade.

.6	Place polyethylene or other plastic film between wood and other finished surfaces of units when stored for extended periods of time.

.7	Cover stored units with protective enclosure if exposed to weather.

.8	Do not use salt or calcium-chloride to remove ice from masonry surfaces.

1.8			ENVIRONMENTAL REQUIREMENTS

.1	Refer to Section [04 05 00] [______].

.2	Conform to Hot and Cold Weather Construction requirements of CSA A371.

2			Products

2.1			MANUFACTURERS

SPEC NOTE: In this article, list the manufacturers acceptable to the specifier. Consider including the name and telephone number of a local distributor to assist bidders with product sourcing.

	.1	Manufacturers of dolomitic limestone masonry units having Products considered acceptable for use:
		.1	Arriscraft[, as distributed by [______]]; Adair® Limestone Marble.

	.2	Substitution Procedures: Refer to [Instructions to Bidders] [and] [Section [01 00 00] [01 25 00] [______]].

2.2			MATERIALS

SPEC NOTE: Dimension limestone is classified by ASTM C568 into three categories, descriptive of the density of the stone, as follows:
Category I – Low-Density: 1,760 – 2,160 kg/m3
Category II – Medium-Density: 2,160 – 2,560 kg/m3
Category III – High-Density: > 2,560 kg/m3

SPEC NOTE: Types of limestone are typically differentiated as either dolomite or calcarenite, depending on their chemical composition. Both types are sedimentary stones, containing a reed or grain running parallel to the natural bed. The difference between the two is largely reflected in the density and appearance of the stone.
•	Dolomitic limestone is a sedimentary carbonate rock consisting of more than 40 percent mineral dolomite, a calcium magnesium carbonate. It is generally very dense, and has a distinctively visible reed or grain.
•	Oolitic limestone is one type of calcarenite limestone, composed largely from the spherical or subspherical particles called oolites or ooliths, which are types of calcarenites. It is generally less dense than dolomitic limestone, and has a more uniform appearance, similar to sandstone.
•	Other types of limestone are also available, such as coquina, microcrystalline or travertine. Refer to ASTM C119 – Definitions of Terms Relating to Dimension Stone for further information regarding these types of limestone.

SPEC NOTE: Adair® Limestone Marble is a High-Density dolomitic limestone, capable of accepting a polished finish. As such, it may also be considered as a marble.

	.1	Dolomitic Limestone: to ASTM C568, Category III – High-Density; special shapes as indicated; having the following typical average properties when tested to the identified standard:
		.1	Compressive Strength: 158 MPa, to ASTM C170.
		.2	Absorption: 0.75 percent, to ASTM C97.
			.3	Density: 2,675 kg/m3, to ASTM C97.
			.4	Modulus of Rupture: 15.5 MPa, to ASTM C99.
			.5	Flexural Strength: 11.0 MPa, to ASTM C880.
			.6	Abrasion Resistance: 18.0, to ASTM C241.

SPEC NOTE: Refer to Arriscraft•DATA sheet 04 43 00 – Stone Masonry for specific information to sizes, finishes, colours, etc. If more than one type of unit is required, identify each separately by adding additional paragraphs as necessary.

2.3			FABRICATED UNITS

.1	Limestone Masonry Units: dolomitic limestone, special shapes as indicated; as described below:
		.1	Bed Thickness: [90 mm] [3-5/8”] thick.
		.2	Unit Length: [590 mm] [23-5/8”] long.
		.3	Unit Height: [90 mm] [190 mm] [290 mm] [3-5/8”] [7-5/8”] [11-5/8”] high.
		.4	Finish: [split] [rocked] [medium dressed] [fine dressed] finish on exposed faces [and ends].
		.5	Colour and Pattern: [Blue-Grey] [Sepia] colour, [fleuried] [striated] pattern, to match approved sample range.
		.6	Product and Manufacturer’s Name: Adair® Masonry Units by Arriscraft.

2.4			ACCESSORIES

.1	Mortar: 1:1:6 Portland cement-hydrated lime-sand mix, as specified in Section [04 05 13] [______].

	.2	Grout: 45 MPa at 28 days, as specified in Section [04 05 16] [______].

	.3	Wall Ties and Anchorages: as specified in Section [04 05 19] [______].

	.4	Joint Sealants and Backer Rods: non-staining type, as specified in Section [07 92 00] [______].

	.5	Flashing, Vents, and Masonry Accessories: as specified in Section [04 05 23] [______].

2.5			FABRICATION TOLERANCES

	.1	Except where dimension stone is formed by a split or rocked finish, fabricate masonry units to the following tolerances:
		.1	Unit Length: plus or minus 3 mm.
		.2	Unit Height: plus or minus 3 mm.
		.3	Deviation From Square: plus or minus 3 mm, with measurement taken using the longest edge as the base.
		.4	Bed Depth: plus or minus 3 mm.
		.5	Custom Unit Dimensions: plus or minus 3 mm.

2.6			SOURCE QUALITY CONTROL

	.1	Test masonry units as specified in Section [01 00 00] [01 40 00] [______].

	.2	Test compressive strength and absorption from specimens selected at random from plant production.

3			Execution

3.1			EXAMINATION

	.1	Verify site conditions are ready to receive work.

	.2	Inspect materials for fit and finish prior to installation. Do not set unacceptable units.

	.3	Beginning of installation means acceptance of existing conditions.

3.2			CUTTING MASONRY UNITS

	.1	Cut masonry units with wet-saw.

	.2	Pre-soak units using clean water prior to cutting.

	.3	Clean cut units using a stiff fibre brush and clean water. Allow units to surface dry prior to placement.

	.4	Finish cut edges to match face when exposed in wall.

3.3			COURSING

	.1	Place masonry to lines and levels indicated.

	.2	Maintain masonry courses to uniform width. Make vertical and horizontal joints equal and of uniform thickness.

	.3	Lay masonry units in [half-running] [third-running] [stack] [_____] bond.

	.4	Course one masonry unit and one mortar joint to equal [[100] [200] [300] mm]
		[[4] [8] [12] inches].

	.4	Maintain mortar joint thickness of [10 mm] [3/8”].

	.5	Tool mortar joints by compacting the surface when thumbprint hard, to a [concave] [raked] [flush] [beveled] [______] finish.

3.4			PLACING AND BONDING

.1	Lay masonry in full bed of mortar, properly jointed with other work. Buttering corners of joints, [and] deep or excessive furrowing of mortar joints [and] [__] are not permitted.

	.2	Fully bond intersections, and external corners.

	.3	Do not adjust masonry units after laying. Where resetting of masonry is required, remove, clean units and reset in new mortar.

	.4	Install [loose steel] [precast concrete] [limestone] lintels as scheduled.

	.5	Install wall ties and anchorages as specified in Section [04 05 19] [______].

	.6	Install flashings, vents, and masonry accessories as specified in Section [04 05 23] [______].

SPEC NOTE: Verify movement joints are properly positioned, located, and detailed on Drawings. Movement / expansion joints in calcium silicate masonry walls should be constructed as “elastic” joints, accommodating both expansion and contraction of the veneer materials. Typically, movement joints should be placed: at changes in wall direction, at changes in building height, at wall openings, at major changes in wall thickness, at periodic lengths of continuous wall up to a maximum of 7.6 metres on centre, at abutments to existing structures, and below shelf angles. Refer to Arriscraft•NOTE (Vol. 1, No. 1), titled Building Movement Joints.

	.7	Construct movement joints as specified in Section [04 05 00] [______].

3.5			SITE TOLERANCES

	.1	Conform to standard tolerances for unit masonry of CSA A371.

3.6			FIELD QUALITY CONTROL

	.1	Perform inspection and testing as specified in Section [01 00 00] [01 40 00] [______].

	.2	[Architect] [Consultant] Inspection: [Architect] [Consultant] will inspect installed masonry and reject masonry that is chipped, cracked, or blemished (streaked, stained or otherwise damaged), as described below.
		.1	Masonry will be inspected to be free of cracks or other blemishes on the finished face or front edges of the masonry units exceeding 10 mm or that can be seen from a distance of 6.0 metres.
		.2	Units shall exhibit a texture approximately equal to the approved sample when viewed under diffused daylight illumination at a 6.0 metre distance.
		.3	Minor chipping resulting from shipment and delivery shall not be grounds for rejection. Minor chips shall not be obvious under diffused daylight illumination from a 6.0 metre distance.
		.4	Dry seams and natural vugs will not be cause for rejection.

	.3	Make Good rejected masonry as directed by [Architect] [Consultant].

3.7			ADJUSTING AND CLEANING

	.1	Repair chips with patch kits furnished by manufacturer.

SPEC NOTE: Select one of the following Paragraphs. Edit as recommended by masonry unit manufacturer’s recommendations. Refer to Arriscraft•NOTE (Vol. 2, No. 1), Cleaning Masonry.

	.2	Clean masonry units as specified in Section [04 05 00] [______].

[OR]

	.2	Clean [a 10 square metre area of wall designated by [Architect] [Consultant]] [one-half of mock-up panel] as directed below and leave for one week. If no harmful effects appear, all objectionable stains removed and after mortar has set and cured, clean masonry as follows:
		.1	Protect windows, sills, doors, trim and other work from damage.
		.2	Remove large particles with [stiff fibre brushes] [wood paddles] without damaging surface.
		.3	Saturate masonry with clean water and flush off loose mortar and dirt.
		.4	Dilute cleaning agent with clean water in controlled proportions.
		.5	Apply solution to pre-soaked wall surface using [soft-bristled brush] [low pressure acid-resistant sprayer].
		.6	Thoroughly rinse cleaning solution and residue from wall surface.

	.3	Use alternative cleaning solutions and methods for difficult to clean masonry only after consultation with masonry unit manufacturer.

3.8			PROTECTION

	.1	Protect units from damage resulting from subsequent construction operations.

	.2	Use protection materials and methods which will not stain or damage units.

	.3	Remove protection materials upon Substantial Performance of the Work, or when risk of damage is no longer present.

END OF SECTION