Enhanced Traditional Stucco
Incorporating Cavity Construction and Elastomeric Acrylic Finish

The WATERWAY DRAINABLE STUCCO assembly is an enhanced traditional stucco system that can be configured as a back ventilated, or a dead air cavity wall cladding system. Both configurations are considered drainage systems in that intruding moisture is able to drain to the exterior. The basic system consists of a rain screen, which protects against moisture intrusion, a drainage cavity that captures intruding moisture and drains it to the exterior and a permeable air barrier, which not only protects against air infiltration into the interior of the building but also guards against liquid moisture penetration and allows for water vapor diffusion.

From Boston to Seattle, the “WaterWay” Drainable Stucco Assembly is finding acceptance with some of the most recognized and distinguished building enclosure specialists in North America. In both new construction and cases of cladding remediation, the WaterWay Stucco assembly accommodates essential criteria in today’s construction environment. Enhancing traditional stucco with an advanced component assembly assures economic feasibility, superior product performance, increased customer satisfaction and an extended service life.

The “WaterWay Stucco Assembly” is a new approach to traditional stucco incorporating through-wall flashing details, secondary moisture barriers, WaterWay drainage mat providing a mechanism of space, traditional cement stucco, polymer modified base coat with reinforcing mesh and an Elastomeric Acrylic Finish. This system answers increasing demand for exterior claddings to enhance envelope integrity and reduce potential challenges associated with moisture penetration.

Stuc-O-Flex, International, Inc. created this modified approach to achieve design objectives while satisfying client requirements and minimizing potential challenges. Over 20 million feet in service without a single compromise confirms the efficiencies of this “WaterWay Stucco Assembly” design.

The “WaterWay” Stucco approach consists of THERM-FLASH (proprietary self-adhering butyl-based flexible flashing), code compliant WRB, WATERWAY DRAINAGE MAT (a drainage matrix of random nylon filaments), accessories, standard scratch and brown stucco, STUC-O-BASE (polymer modified base coat) with reinforcing fiberglass mesh complete with STUC-O-FLEX (Elastomeric Acrylic Finish) and appropriate sealant. The materials unique to this design are described below:

THERM-FLASH Butyl-Based Flexible Flashing

Aggressive adhesion and initial tack – No priming requirements, no solvents or bleeding oils, compatible with sealant materials, wide temperature range, Class “A” fire rating, and a thick foil fascia on the top surface.

Therm-Flash Flexible Flashing

WATERWAY RAINSCREEN DRAINAGE MAT

WaterWay Rainscreen Drainage Mats consist of a Nylon / Polymer core of fused, entangled filaments in varying thicknesses from a nominal 1/4 inch to 3/4 inch, depending on desired cavity space and cladding selection. Certain profiles are available with a protective filter fabric bonded to one side or consider WaterWay Plus - a revolutionary “Patent Pending” Drainage Mat consisting of a .45” / 11.4mm thick polymer matrix heat laminated to a breathable filter fabric on one side and a code compliant weather resistive barrier (WRB) on the other side.

WaterWay Rainscreen Drainage Mats

STUC-O-BASE & Fiberglass Reinforcing Mesh

Smooth and flatten brown coat prior to Stuc-O-Flex finish application. Increased flexural strength, reduced likelihood of cracks and potential efflorescence. Uniform porosity offers more consistent finished appearance.

Fiberglass Reinforcing Mesh     Stuc-O-Base

STUC-O-FLEX Elastomeric Acrylic Finish

100% pure Acrylic polymer combined with Calcium aggregate (no rust); Unmatched elasticity and crack bridging capability; Over 500 million feet of history. Four aggregate finish choices (unlimited texture opportunities); Breathable, water vapor transmission (13 perms/average); and Complete ASTM Testing by 3rd party labs recognized facilities.

Considering the litigious nature of construction defect exposure and consequential challenges verses the historical success in remediation utilizing “WaterWay” Drainable Stucco, consider the concept of "Create Some Space Between Your Building & The Elements"

Stuc-O-Flex

For additional information on the “WaterWay” Stucco Assembly, including product data sheets, test reports, specifications, details and an animated DVD application specific presentation, Email at link above or Call 1-800-305-1045:

“STEP BY STEP” OVERVIEW

SUBSTRATE: Acceptable sheathing types include those typically approved for local use such as plywood, oriented strand board, Exterior gypsum, cementitious panels and others. Consult local codes for approved materials Substrate shall be clean, dry and free of foreign materials, etc.
SILL SCREED: Install foundation sill / weep screed with 3 1/2 “ minimum leg at the base of the wall. Install 6” Therm-Flash Flexible Flashing across the vertical leg of sill / weep screed. 3” of Therm-Flash Flexible Flashing shall rest upon metal and the balance against substrate. Foundation weep screeds at the base of the wall shall be secured to framing with the appropriate fastener. Locate foundation weep screed so that it overlaps the joint between the foundation and framing by a minimum of 1 inch (2.54 cm). Locate the foundation weep screed minimum 4 inches (10 cm) above earth grade, 2 inches (5 cm) above finished grade.
SECONDARY MOISTURE BARRIER Install two layers of asphalt-saturated 60 minute Grade "D" building paper or code compliant alternate over substrate. Lap barrier 3 inches (8 cm) minimum at horizontal terminations and 6 inches (15 cm) minimum at vertical terminations. Any cuts required to be made in the weather-resistive barrier shall be weather lapped with additional barrier material. Weather-resistive barrier shall be properly lapped, flashed and integrated with “WaterWay” Flexible Flashing at all through wall penetrations including window, door, and louver, and other openings.
WATERWAY FLEXIBLE FLASHING Therm-Flash Flexible Flashing is a self adhering membrane featuring a durable heavy duty foil film surface with a 100% butyl rubber adhesive. The film surface provides excellent tear and puncture resistance. The adhesive surface is protected with a removable release film for ease of installation. The membrane provides a tight seal around windows, doors and other penetrations in exterior walls.
WATERWAY DRAINAGE MAT Install specified profile of Waterway Rainscreen Drainage Mat to wall surface butting tightly at window, door casing and other through wall penetrations. Waterway Drainage Mat shall be tightly butted not overlapped. Attach with corrosion resistant fasteners. Surface mount appropriate grounds, expansion joints, casing bead, reveals, sill screed, etc. comply with specifications and industry standard. Note: Accessories shall be set back as required allowing for proper backer rod and sealant at system terminations unless otherwise detailed.
LATH OR WOVEN WIRE Self-furring, expanded metal or woven wire lath is installed over the WaterWay Drainage Mat consistent with construction documents and appropriate building codes.
SCRATCH COAT Apply stucco with sufficient pressure to key into and embed the metal lath. Apply sufficient material, approximately 3/8 inch plus, to cover the metal lath and to permit scoring the surface. Score the stucco upon completion of each panel in preparation for a second coat. Score horizontally.
BROWN COAT As soon as the first coat is firm enough to receive the second coat without damage, apply the second coat (brown coat) with sufficient pressure to ensure intimate contact with the first coat to an approximate thickness of 3/8 inch as needed to bring the stucco to a uniform thickness that matches the grounds of the 3/4” - 7/8” inch accessories. Use a rod or straight edge to bring the surface to a true, even plane. Fill depressions in plane with stucco.
STUC-O-BASE & FIBERGLASS REINFORCING MESH Apply a 1/16” – 1/8” layer of Stuc-O-Base mixed 1 to 1 with Portland cement Type I or II. Embed Stuc-O-Flex fiberglass reinforcing mesh into wet base coat, trowel smooth. Allow to dry a minimum 24 hours.
STUC-O-FLEX ELASTOMERIC FINISH Stuc-O-Flex Elastomeric Acrylic Finish consistent with specified color and texture will complete the “WaterWay” Stucco assembly. Protect from inclement weather until dry. Finished work to match approved mock-up.