Conference for Catholic Facility Management Provider Number: G460

A Basic Understanding of Exterior Stucco Design andMaintenance for Churches and Schools

Course Number: PHX1609

Albert Carrillo Technical Services Information BureauDate: April 29, 2016

TSIB

Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.

This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner ofhandling, using, distributing, or dealing in any material or product.___________________________________________

Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

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This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the

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TSIB

Technical Services Information Bureau; Conference For Catholic Facility Management 2016

This course will provide participants with a basic understanding of the “nuts and bolts” of the application and maintenance of Portland Cement Plaster as an exterior finish assembly for Churches and schools. The course will review the acceptable substrates for exterior stucco, and the means, methods and materials of the stucco process. In addition, the course will address common preventative maintenance needs of an exterior stucco assembly to increase the longevity of the material and minimize long-term performance issues. A brief description of the differences in materials, applications, and longevity between an exterior stucco assembly and an exterior insulation and finish system (“EIFS”) will be presented.

CourseDescription

LearningObjectives

At the end of the this course, participants will be able to:

1. Understand the basic components of a stucco assembly and how they perform together.

2. Understand the similarities and differences between stucco and Exterior Insulation and Finish Systems (EIFS).

3. Understand and address common preventative maintenance needs of stucco assemblies.

4. Understand the performance, and longevity expectations of a stucco assembly and EIF system.

A Basic Understanding of Exterior Stucco Design

C 847 – Specification for Metal Lath

C 933 – Specification for Welded Wire Lath

C 1032 – Specification for Woven Wire

C 897 – Specification for Aggregate for Job-mixed

Portland Cement – Based Plasters

C-1063 - Standard of Lathing for Cement Plaster

C-926 – Specification for Application of Portland Cement-

based Plaster

IBC - Chapter 25

IRC - Chapter 7

• Substrates shall have a maximum deflection criteria of L/360. (Deflection 1/3” per 10’ span)

• Must be capable of bearing weight of stucco

• Designed to meet anticipated positive and negative windload

• Plywood

• OSB

• Exterior Gypsum

• Glass Mat Sheathing

• Cement Board

• Asphalt Impregnated Sheathing

• Rigid Foam Insulation(EPS)

• Installed with the proper side out

• Gap joints a minimum of 1/8 inch• Engineered Wood Association

• C-1063 – ANNEX A.1.1

• Requires two layers of Water Resistive Barrier

• Concrete Masonry (CMU)

• Cast in Place or Tilt-up Concrete

• Insulated Concrete Forms (ICF)

• Adobe, Rammed Earth, Rastra Block

• Structurally Insulated Panels.(SIPS)

Flashing

Water Resistive Barrier

Lath

Stucco

Finish

Flashing

Water Resistive Barrier

Lath

Stucco

Finish

•Windows•Doors•Electrical•Plumbing•Vents

•Beams•Scuppers•Joists•Decks•Chimneys

• Metal: Copper, Aluminum, Stainless

• SAF – Self Adhered Flashings

• Sheet Goods

• Fluid Applied

Stucco

Stucco

Barrier

Flashing

Water Resistive Barrier (WRB)

Lath

Stucco

Finish

• Applied horizontally only

• Applied in a “shingle fashion”

• Integrated with flashings

• Free of holes tears and breaks

• Must be continuous

• Asphalt saturated paper – Grade D

• Spun bond polyolefin – synthetic wraps

• Liquid applied

Flashing

Water Resistive Barrier

Lath

Stucco

Finish

• Supports the weight of the stucco assembly• Achieve required stucco thickness• Crack suppression• ASTM C 1063

• Self furring 1 inch 20 gauge (one-coat)• Self furring 1 inch 17 gauge (three-coat)• Expanded metal lath (2.5 or 3.5)• Optional over CMU or concrete

• Oriented at a right angle to framing members

• Fasteners must be galvanized

• Screws, nails, staples

• Spaced not more than 7 inches

• Staples - min crown 1 inch

• Wood studs penetrate min 1 inch

• Expanded Metal – Flat and Self-furred

• Rib Lath - Flat Rib & High Rib (soffits)

• Woven Wire – Stucco Netting

• Welded Wire Lath

• Paper Backed Lath• All of the above

Typically used for ceilings in wood framed construction

Self Furred

Diamond Lath Stucco Netting

Weep Screed Casing Bead Corner Bead

Strip Lath Corner ReinforcementControl Joint

1. Expanded metal lath

2. Corner bead flange

3. Expansion joint

4. Stucco stop (66)

1

2

3

4

Before any stucco is applied:

• Roof materials should be loaded onto roof surface

• Drywall should be installed on all perimeter walls (Those to receive stucco)

Flashing

Water Resistive Barrier

Lath

Stucco

Finish

Any cement product used as an exterior wall coating.

•One Coat

•Three Coat

Assembly

Machine applied

Hand Applied

• A proprietary cladding system consisting of lath, one basecoat and a finish

• Fiberglass reinforced, acrylic modified cement basecoat

• Concentrated base mixed with washed sand and potable water

• 3/8 inch minimum thickness 1/2 inch maximum thickness

• 6 lbs. Per square foot (approximately)

• Introduced in the early 70’s• Commonly applied over foam sheathing in

residential• Commercial projects over solid sheathing• Is not part of ICC – ICC Evaluation Service

(www.icces.org)

Residential Commercial

•ICC – Chapter 25 Gypsum Board and Plaster

•ASTM C 926 – Application of Portland Cement-Based Plaster•ASTM C1063 – Installation of Lathing and Furring to Receive Interior

and Exterior Portland Cement Plaster

•Weight - 10-12 lbs/sq ft

•Oldest form of exterior cladding

• A Portland cement-aggregate plaster mix designed for use on exterior surfaces

Three-coat – Cement layers consist of a scratch, brown and finish layer, three coats

• Machine or hand applied

• Applied to proper thickness. Metal trims are screeds

• Floated with hard rubber float

• not a sponge float

• Allowed to hydrate properly

• Wet cured for a minimum of 48 hours after installation. Let stand for 28 days before finishing

Proper densification

Improper Densification

Flashing

Water Resistive Barrier

Lath

Stucco

Finish

• Cement based finish• Cement , lime and sand (painted)

• Intregally colored cement

• Acrylic, Elastomeric and Specialty Finishes • Many textures available from smooth to rough

• Colorfast with integral coloring

Synthetic stuccoInsulating stuccoLightweight acrylic stuccoEfes

Exterior Insulation and Finish System

Barrier

Drainage

Barrier

Drainage

• Barrier EIFS – full system inspections required

• Type V, Group R-1, R-2, R-3, R-4

Drainage EIFS system required

• Secondary WRB special inspections required

Code Requirements

1.

2.

3.

4.

2.

1. Expanded PolystyreneInsulation Board (EPS)

2. Base Coat *

3. Reinforcing Mesh * embedded in base coat (for impact and moisture resistance)

4. Acrylic Finish * integrally colored

* Basecoat, mesh and finish are referred to as the Lamina layer

Framing member

Substrate

Secondary Weather Barrier

Adhesive

EPS Foam

Base Coat

Sheathing Joint mesh

Mesh

Acrylic Finish

Flashing membrane

Drainage Chanel

Drainage EIF System

Adhesive Attachment

• EIF systems are always attached to a substrate.

• Approved Substrates:• ½ wood sheathing

• Exterior grade gyp sheathing

• Fiber faced gyp sheathing

• Cement board

• Stucco, concrete, CMU

Mesh starts a minimum of two inches behind (back) EPS foam and is brought (wrap) around edges and onto face.

• All EPS foam must be fully encapsulated.

• Backwrap mesh is installed along with EPS foam.

• Protects EPS, Moisture intrusion, Fire and Insect infestation•

Proper Mesh Embedment

NO OK GOOD

Used in high traffic areas

Substrate

EPS

High Impact Mesh

Standard Mesh

Base Coat

FinishAdhesive

• Stucco• Metal trims – depth = one coat or three coat

• Some cracking

• Dead-blow resonance

• EIFS• Definite resonance

• Very few control joints

• Intricate design

• No need for WRB• May have increased chance of cracking• Always use lath and accessories

• No need for WRB• Always include foam

• Annual maintenance• Visually check all sealant joints

• Visually check all flashing components

• Check exterior cladding

• Wash off any surface dirt accumulation with a garden hose. Never use a high pressure sprayer

• Remove built up debris from contact with cladding

• Annual maintenance• Visually check all sealant joints

• Visually check all flashing components

• Check exterior cladding

• Wash off any surface dirt accumulation with a garden hose. Never use a high pressure sprayer

• Remove built up debris from contact with cladding

• Annual maintenance• Visually check all sealant joints

• Visually check all flashing components

• Check exterior cladding

• Wash off any surface dirt accumulation with a garden hose. Never use a high pressure sprayer

• Remove built up debris from contact with cladding

• Annual maintenance• Visually check all sealant joints

• Visually check all flashing components

• Check exterior cladding

• Wash off any surface dirt accumulation with a garden hose. Never use a high pressure sprayer

• Remove built up debris from contact with cladding

• Annual maintenance• Visually check all sealant joints

• Visually check all flashing components

• Check exterior cladding

• Wash off any surface dirt accumulation with a garden hose. Never use a high pressure sprayer

• Remove built up debris from contact with cladding

• Annual maintenance• Visually check all sealant joints

• Visually check all flashing components

• Check exterior cladding

• Wash off any surface dirt accumulation with a garden hose. Never use a high pressure sprayer

• Remove built up debris from contact with cladding

• Do not hang signs on cladding

• Avoid hitting cladding with lawn tools, i.e. mowers, trimmers, shovels etc.

• Do not stand on any cladding surface

• Do not attempt to patch any holes or cracks with spackle

• Do not clean surfaces with oil-based products

• When in doubt, call a professional

This concludes The American Institute of Architects Continuing Education Systems Course

Andy Guljas 317-525-7176

TSIB

Albert Carrillo Technical Services Information Bureau

Thank You