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stucco basics and beyond

Stucco Basics and Beyond

AIA Presentation

slide2
Master Wall Inc. is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to the CES Records for AIA members. Certificates of Completion for non-AIA members are available on request

This program is registered with the 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 of handling, 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.

Thank You!

learning objectives
Learning Objectives
  • What is Stucco?
  • Stucco Components and Terms
    • Water barriers
    • Metal Reinforcement
    • Stucco Enhancements
    • Related Trims and Components
  • How to Specify and Design Stucco
what is stucco
What is “Stucco”?
  • In its most basic form, stucco is a mixture of Portland cement, sand and lime
    • Ratios of these products vary depending upon application
  • Generally stucco is a field mixed product, although concentrated versions are available
  • ASTM C926 is the standard specification the application of Portland Cement-Based Plaster
  • ASTM C1063 is the standard specification for the Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
basic stucco components
Basic Stucco Components
  • Substrate (if used)
  • Weather-Resistive or water barrier
    • Over sheathed applications
  • Metal Lath or reinforcement
  • Stucco
    • Thickness varies by application
  • Primer
  • Finish Coat
international building code ibc
International Building Code (IBC)
  • Gypsum Board and Plaster are defined in Chapter 25 of the IBC
  • Weather-resistant barriers are defined in Section 2510.6
    • A weather-resistive vapor permeable barrier with a performance at least equivalent to two layers of Grade D paper.
  • Exterior Plaster is defined in Section 2512
    • Basically references ASTM
    • Typical nominal thickness is 7/8” over lath and 5/8” over concrete & masonry
international residential code
International Residential Code
  • Defined in Chapter 7 of the IRC
  • Weather barriers are defined in Section R703.2
    • ASTM D-226 asphalt felt, weighing not less than 14 lbs per 100 square feet
    • Not required under paperbacked stucco lath
  • Section R703.6 defines Exterior Plaster
    • Basically references ASTM
  • Table R702.1(1) lists nominal thickness
    • 5/8” over metal lath
    • 7/8” over wire lath
    • 1/2” minimum over masonry
    • 7/8” maximum over concrete
components terms

Components & Terms

Know the lingo

weep screed
Weep Screed
  • A weep or sill screed is installed at the bottom edge of sheathed installations.
  • The screed has a set GROUND (stucco thickness) that corresponds to the overall nominal stucco thickness (3/8”, 1/2” 5/8”, 3/4”, 7/8”)
  • Place level, approximately 2” onto the foundation wall, but at least 6” above grade
casing beads
Casing Beads
  • Casing Beads are used where the system ends – mainly windows and doors
  • Specify the sealant joint width for the anticipated movement
control joints
Control Joints
  • Control joints control movement within the stucco panels
  • Control joint locations should be clearly shown on the drawings
  • Seal all joints, set control joint laps in sealant, improve detailing by specifying peel and stick tape under control joints
inside corners
Inside Corners
  • Use either casing or control joints at inside corners
metal lath
Metal Lath
  • Several kinds available
    • 2.5 or 3.4 #/sy most common
  • Self furred to space lath out from wall
  • Widths vary by manufacturer
    • Each piece covers approximately 16 square feet
lath installation
Lath Installation
  • Install with long dimension at right angles to framing
  • Lap seams at least ½”, sides at least 1”
  • Run at least 2” over accessories
  • Break at control joints
  • Stagger pieces so laps don’t line up
lath installation15
Lath Installation
  • Plan your layout
  • It’s best to have lath end at a structural framing member
  • If not, wire tie lath together every 6”
lath installation16
Lath Installation
  • Plan for corners
    • Lath may be cut at corners if corner bead or cornerite is used
    • If not, lath must run continuously to the first structural framing bay (minimum)
    • Attach through lath to framing every 6”
lath attachment
Lath Attachment
  • Attach to framing members every 6”
    • Nails, some staples, lath locks
  • Wire tie laps every 8”
  • Wire tie control joints every 6”
  • Attach 9” x 12” diagonal corner reinforcement at windows and doors that do not have expansion joints
scratch coat
Scratch Coat
  • The first coat of a stucco application
  • Applied to approximately half the final thickness
  • Scratch or score the surface horizontally
brown coat
Brown Coat
  • The Brown Coat is started soon as the first coat is firm enough to hold it
  • Additional material is used to level the stucco to the ground thickness
  • A rod or Darby is used to level the surface
  • Level or float the surface to even the surface
stucco curing
Stucco Curing
  • Moist cure the stucco by fogging for at least 48 hours
  • Spray down walls with gentle pressure using clean, potable water
  • If humidity is high (75% plus) and wind movement is low fogging requirements can be reduced
  • Allow stucco to cure and harden. 7 days is currently promoted (specify)
  • Additives can lessen curing time
improving the stucco mix
Improving the Stucco Mix
  • Acrylic added to the stucco will improve the properties
    • Aids or reduces curing times
    • Increases compressive strength
    • Small amounts are beneficial, up to a maximum of 10% acrylic solids
  • EIFS Base Coats and Meshes improve performance and appearance
    • Additional leveling coat and mesh to aid in reduced cracking
attaching and adding decorative foam trim
Attaching and Adding Decorative Foam Trim
  • Cut insulation pieces to desired size
  • Attach to wall using manufacturer-approved base coat or specialty adhesives
  • Rasp and mesh following manufacturer-recommended guidelines
  • Do not run trim pieces through control joints or other expansion joints. Backwrap and use an expansion joint if needed
priming
Priming
  • Priming the wall is recommended
    • To equalize absorption of finishes
    • For better alkalinity resistance
  • It may not be required by a manufacturer, so specify it for a better looking project
basic finish types
Basic Finish Types
  • Texture-Type
  • Bold, even
  • Fine, even
  • Heavy Riled
  • Standard Formulations work great
  • Elastomeric Formulations better bridge minor cracking
  • Riled
specifying stucco
Specifying Stucco
  • Reference ASTM C926 and C1063 for stucco and lath application guidelines
    • These are also referenced in building codes
    • Unless your understanding of stucco is high, consult with a manufacturer for specifics
  • Helpful groups include the Portland Cement Association (PCA), Association of Wall and Ceiling Industries (AWCI) and Northwest Wall & Ceiling Bureau (NWWCB)
specifying above code
Specifying Above Code
  • Specify peel and stick type water barriers around all penetrations
  • Specify interior sealants at any wall penetration – usually minimal expanding polyurethane
  • Always require full window splining by the window installer
layout isometric
Layout Isometric

Substrate (if used)

Weather-resistive barrier

Metal Lath/Reinforcement

Stucco (1/2” to 3/4” thick)

Primer (if used)

Textured Finish

cross section
Cross Section
  • Typically up to 7/8” thick on concrete and 1/2” thick on masonry

Concrete/Masonry Substrate

Bonding Agent (if needed)

Stucco

Textured Finish

cross section31
Cross Section
  • Use ¾” grounds for 7/8” Stucco, ½” grounds for 5/8” stucco

Control Joint Accessory

Substrate (if used)

Water Barrier

Metal Lath

Stucco

Textured Finish

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Show Control Joint Locations

  • Joints should be clearly shown on the drawings
    • To limit cracking in the system at a maximum area of 144 ft2 (13.4 m2).
    • Length to width ratio should not be more than 2.5:1.
    • At dissimilar substrates.
  • Increase joint requirements where thicker stucco or special structural conditions exist.
  • Typically control joints are tied to the metal lath, which is cut to make two discontinuous slabs.
  • When stucco is bonded to a solid substrate such as concrete or masonry the control joint requirements may be revised. Control joints may be aligned with any control joints in the plaster base.
corner detail
Corner Detail
  • A corner joint accessory or corner-aid is used

Corner Bead

Substrate (if used)

Water Barrier

Metal Lath

Stucco

Textured Finish

clad window head
Clad Window Head
  • Allow space for drainage at window heads

Textured Finish

Stucco

Metal Lath

Water Barrier

Stucco Casing Trim

Window Head Flashing (if needed)

Window

clad window with trim
Clad Window with Trim

Textured Finish

Slope 1:2 min

Primer (recommended)

Base Coat and Mesh

EPS Trim

Adhesive

Stucco

Metal Lath

Water Barrier

Stucco Casing Bead

Window Head Flashing (if needed)

Window

window jamb detail
Window Jamb Detail

Textured Finish

Stucco

Metal Lath

Water Barrier

Casing Bead

Sealant – design & size for anticipated movement

Window

window jamb detail with trim
Window Jamb Detail with Trim

Textured Finish

Primer (recommended)

Base Coat and Mesh

EPS Trim

Adhesive

Stucco

Metal Lath

Water Barrier

Stucco Casing Bead

Sealant – design and size for anticipated movement

Window

window sill detail
Window Sill Detail

Window

Sealant – design & size for anticipated movement

Stucco Casing Bead

Textured Finish

Stucco

Metal Lath

Water Barrier

window sill with trim
Window Sill with Trim

Window

Sealant – design & size for anticipated movement

Stucco Casing Bead

Slope 1:2 min

Textured Finish

Primer (recommended)

Base Coat and Mesh

EPS Trim

Adhesive

Stucco

Metal Lath

Water Barrier

downspout detail
Downspout Detail

Downspout Strap

Sealant

Fastener into solid substrate – set in sealant or with gasket, snug fit

Downspout

Textured Finish

Stucco

Metal Lath

Water Barrier

floor line expansion joint
Floor Line Expansion Joint

Substrate (if used)

Water Barrier

Casing Bead (shown) - could also use a control joint or reveal accessory

Sealant Joint – designed & detailed for anticipated movement (a 2x12 can shrink as much as ¾”)

Metal Lath

Stucco

Textured Finish

pipe penetration
Pipe Penetration

Sealant

Pipe Penetration

Textured Finish

Stucco

Metal Lath

Water Barrier

soffit gable detail
Soffit/Gable Detail

Trim – Extend about 2” over stucco

Textured Finish

Stucco

Metal Lath

Water Barrier

light fixture detail
Light Fixture Detail

Light Fixture – sealed by electrician

Electrical Box (seal)

Optional Casing Bead

Textured Finish

Stucco

Metal Lath

Water Barrier

dryer vent detail
Dryer Vent Detail

Fastener – snug fit

Dryer Vent – set in sealant

Sealant

Optional Casing Bead

Textured Finish

Stucco

Metal Lath

Water Barrier

foundation detail
Foundation Detail

Textured Finish

Stucco

Metal Lath

Water Barrier

Stucco Weep Screed

Keep siding 6” to 8” above grade

termination at decking
Termination at Decking

Textured Finish

Stucco

Metal Lath

Water Barrier

Stucco termination – L bead shown, drainage casing beads also available

Deck flashing – secondary water barrier and peel and stick tapes are encouraged

detail under deck
Detail Under Deck

Deck flashing – secondary water barrier and peel and stick tapes are encouraged, lap flashing 2” over stucco, seal lower edge

Stucco Casing Bead

Textured Finish

Stucco

Metal Lath

Water Barrier

coping cap detail
Coping Cap Detail

Coping Cap with secondary water barrier

Continuous Cleat – extend 2” over stucco

Optional Casing Bead

Sealant

Textured Finish

Stucco

Metal Lath

Water Barrier

eps shape detail
EPS Shape Detail

Slope 1:2 min

Textured Finish

Primer (recommended)

Base Coat and Mesh

EPS Trim

Adhesive

Stucco

Metal Lath

Water Barrier

*Note: don’t run EPS shapes through control or expansion joints

kick out flashing detail
Kick Out Flashing Detail

Design Roof Flashing per National Roofing Contractors Association (NRCA) and code guidelines

Lap stucco water barrier onto flashing

Keep siding 1” to 2” above roof line

Kick Out Flashing/Sealant

Stucco

thank you for your time
Thank You For Your Time

? Questions ?

This concludes the American Institute of Architects Continuing Education Program

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