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STONE VENEER SCOPE OF WORK





Objective of this Scope of Work

► To ensure that the Stone Veneer is installed in a manner consistent with all applicable building codes, manufacturer's instructions and warranty requirements, and acceptable construction practices.

Terms used in this document

► SITE SUPERINTENDENT: shall refer to any Company representative with authority to enforce this Scope of Work.
► SUBCONTRACTOR: shall refer to the Subcontractor's organization, its employees, or any representative of the Subcontractor assigned the authority to perform per this Scope of Work.
► MSV: Manufactured Stone Veneer
► WRB: Water-Resistive Barrier



Details (click to view)

Thanks to the National Concrete Masonry Association Document TEK 20-1. (http://ncma-br.org/pdfs/17/TEK%2020-01.pdf)



Acceptable Performance

Stone Veneer: General

► The Subcontractor shall review the plans with the Site Superintendent prior to beginning work to ensure that the Subcontractor is familiar with the work to be done and the materials to be used.
► Any corrections that have to be made because the Subcontractor did not review the plans with the Site Superintendent shall be corrected at the expense of the Subcontractor.
► The specifications for the stone veneer used on a house is determined by the options selected by the purchaser.
► The Work Order will specify the type of stone veneer to be used. Company will furnish the stone veneer material. The Subcontractor will furnish all fasteners.
► All stone veneer will be installed per the manufacturer’s specifications.
► Trained, experienced individuals shall install all stone veneer.
► All stone veneer shall be installed per plan using the fasteners required by the manufacturer. Stone veneer is to be installed per the manufacturer’s installation instructions.
► The Subcontractor is expected to eliminate excess waste of materials.
► The Subcontractor shall follow all safety rules in regard to ladders, scaffolding, safety rails, etc. If pump-jack-type scaffolding is used, handrails must be in place at all times.

Stone Veneer: Installation

Substrate Preparation

► Where structural panel sheathing (plywood or OSB) is used as substrate, it must have a 1/8" gap on all edges to accommodate expansion.
► Sheathing must be relatively dry prior to stone veneer installation.
► There should be little or no deflection in the wall sheathing.
► If these conditions are not met, inform the Site Superintendent prior to installing the stone veneer.
► If wall is of concrete or concrete masonry units, stone veneer may be applied directly to the to wall surfaces only if the surfaces are free of dirt, waterproofing, paint, form oils, or any substance which may inhibit the mortar bond, and the surface texture has a rough surface to ensure a mortar bond.
► If either of the conditions are not in evidence, attach lath and a scratch coat before installing stone veneer.

Water Management

► Install two separate layers of water-resistive barrier (WRB) over wood sheathing.
► The first layer creates a drainage plane.
► The second layer should lap the top of the first layer by a minimum of 2 inches.
► All vertical (side) joint of WRB shall lap by 6 inches.
► All inside and outside corners must be overlapped a minimum of 16 inches past the corner in both directions.
► Flashing at all penetrations must be integrated with the WRB so that water is directed out of the system.
► Capping materials shall be properly installed to prevent water intrusion.

Metal Lath Selection

► All lath must be self-furred or use self-furring fasteners to allow the mortar to completely fill and encase the lath.
► All lath and lath accessories must be corrosion resistant, consisting of either galvanized or stainless steel materials or nonmetallic lath.

Metal Lath Installation

► Metal lath shall be applied horizontally (perpendicular to framing, if present).
► Metal lath shall overlap a minimum of 1 inch at the vertical seams and a minimum of 1/2 inch at the horizontal seams. The ends of adjoining lath pieces shall be staggered.
► On all horizontal laps, the uppermost course shall overlap the lower course.
► Lath shall be wrapped around inside and outside corners a minimum of 12 inches.
► Lath shall be fastened every 7 inches vertically on each stud. The spacing of studs should not exceed 16 inches.
► Lath is considered to be embedded within the mortar scratch coat when there is a 1/4 inch nominal thickness of mortar between the back plane of the lath and the back plane of the scratch coat for at least one-half (50%) of the surface area of the installation.
► When lapping paper-backed lath, be sure that lath is against lath and paper against paper. Do not allow paper to cover any portion of the lath.

Metal Lath Fastening

► Corrosion-resistant fasteners require a minimum 3/4-inch nail penetration into wood framing members, a minimum 3/4-inch staple penetration into wood framing members, or a minimum 3/8-inch penetration of metal framing members.
► Fasteners must have heads large enough to properly engage the lath.
► Fasteners shall be anchored into the FRAMING MEMBERS and are to be spaced no more than 7 inches on center.
► For installation directly to wood framing members, use at least 1 1/2-inch roofing nails to horizontal framing members. Vertical applications require the use of 1-inch roofing nails, 1-inch staples with minimum 3/4-inch crowns, or 6d common nails driven to a penetration of at least 3/4 inch and bent over to engage at least three strands of lath.
► Where welded or woven wire lath is installed, rest the wire on the fastener for best performance rather than installing the fastener above the wire.

Clearances

► Exterior Stud Wall clearances shall be 4 inches from grade/earth and 2 inches above paved surfaces such as driveways, patios, etc. Clearance minimum can be reduced to 1/2 inch if the paved surface is a walking surface supported by the same foundation that supports the wall.
► Where stone veneer continues down a CMU foundation wall with water resistive barrier and lath, clearances shall be 4 inches from grade/earth and 2 inches above paved surfaces such as driveways, patios, etc. Clearance minimum can be reduced to 1/2 inch if the paved surface is a walking surface supported by the same foundation that supports the wall.
► For exterior concrete or masonry walls with or without lath and weep screeds, clearance shall be 2 inches from grade or 1/2 inch from a paved surface.

Mortar

► The proper mortar for scratch coats, setting and pointing shall be Type N or S for site-mixed or for premixed mortar.
► The scratch coat shall be applied with sufficient material and pressure to completely encapsulate the lath to a nominal thickness of 1⁄2 inch.
► The scratch coat surface shall be horizontally scored after the scratch coat is somewhat firm.

Setting Stone Veneer

► The set stone veneer should exhibit ample squeeze-out between the units, demonstrating that sufficient bed mortar has been used.
► The pointing mortar shall be finished with a concave or V-groove tooling.
► Mortar debris shall be cleaned with a dry, soft-bristled brush. Do not use a wet brush to treat uncured mortar joints.

Stone or Stone Veneer Under Exterior Door Thresholds

► In any exterior application of stone or stone veneer, the subcontractor must install the product under the exterior door threshold of any door which has the product installed around it.

Situations to Avoid

► Do not allow de-icing chemicals, salt, or other harsh chemicals such as acid cleaners and pool chemicals to come in contact with stone veneer.
► Do not place sprinklers and downspouts in positions which would result in frequent moistening of the stone veneer.
► Avoid installing stone veneer in areas where they may be kicked, scraped or scuffed (such as on stair risers).

Clean-Up

► All construction debris is to be removed to the dumpster or designated trash collection area and the job site is to be left clean.
► Any items found during the final inspection that need correction shall be corrected before payment will be made.

Payment will be made for the job when the Stone Veneer installation is completed and accepted.


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