MAF Masonry knowledge base

Masonry Association of Florida, Inc. Florida Builds with BLOCK, BRICK & Stone.
  • News
  • Knowledge Base
  • FloridaMasonry.com
  • CWFN Home

Control joint spacing in stucco on block

8/12/2020

6 Comments

 
In stucco on block What are the control joint spacing requirements for stucco on block? "Control joint spacing in masonry is usually between 20’ to 25’ on center.   Joint spacing and location in stucco is dependent on whether the stucco is directly applied to the solid substrate or is placed onto lath which in turn is attached to the wall.
​In the case of directly applied (called “direct applied”) stucco the bond between the stucco and the solid substrate (in this case concrete block) is the most important thing.    With good bond the thin layer of stucco will crack in any place the solid substrate cracks.  Thus, there should be a control joint in the stucco at any location that you find a control joint in the block.   There are no other control joints required in direct applied stucco.

In stucco on lath, the ASTM 1063 code requires a control joint at a maximum spacing in walls of 18 ft o/c both horizontally and vertically enclosing an area no more than 144 sf.  The area enclosed by the control joints cannot have a length to width ratio greater than 2 ½ :1 .  The control joints in the lath are not require to line up with the control joints in the block because in this case the stucco layer is independent of the wall to which it is attached."
6 Comments
Bryson Mills link
3/21/2021 03:50:42 pm

Grrateful for sharing this

Reply
David Lockhart
7/7/2021 06:04:37 pm

How do you control the grounds (stucco thickness without casing) Additionally, you needs casing to separate dissembler materials

Reply
Don Beers, PE
7/8/2021 02:03:28 pm

Hi David, There is nothing in the code that prevents you from putting in additional casing and control joints. The misconception that we wanted to dispel is that control joints are “required” by the code in direct applied stucco at locations other than where you find control joints in the substrate. I would reinforce the potential leakage problem inherent with all installed stucco joints. Proper detailing of joints is essential for a leak proof stucco coating. As you mentioned there should be a joint at dissimilar materials.

Don Beers, PE

Reply
[email protected] link
4/20/2022 02:50:15 am

Thank you for sharing this article, keep up the good work. Really appreciated.

Reply
Roof Shingles Halifax, NS link
10/10/2023 10:13:14 am

This is the perfect post.It helped me a lot. If you have time, I hope you come to my site and share your opinions. Have a nice day.

Reply
Bobbi M link
8/29/2024 05:21:42 am

Great blog you havve here

Reply



Leave a Reply.

    Authors:

    Picture
    Jerry Painter, FASTM
    352-378-7511
    [email protected] 

    Picture
    Don Beers, PE, GC
    561-310-9902
    [email protected]

    Categories

    All
    #5 Rebar
    Backer Rod
    Backup Wall
    Bar Hooks
    Block Strength
    Bond Beam
    Bond Breakers
    Brick
    Brick Veneer
    C129
    C90
    Cavity Wall
    Cell Size
    Cell Width
    Cmu
    Code Editions
    Code Requirements
    Codes
    Concrete Block
    Concrete Interlocking Pavers
    Concrete Pavers
    Construction Guidance
    Control Joint
    Control Joints
    Corner Attachments
    Cracking
    Crosswebs
    De-bonded Veneer
    Density
    Design Criteria
    Driveway
    Energy
    Energy Efficiency
    Energy Loss
    Envelope Leakage
    Expansion Joints
    FBC
    FBC 6th Edition
    FBC 7th Edition
    Filling Cells
    Fine Aggregate Grout
    Fire Rating
    Florida Building Code
    F''m
    Grouted Beam
    Grout Height
    Grouting
    Grouting Of Block Walls
    High Strength Masonry
    High-strength Masonry
    High Wind
    High Wind Construction
    HJR
    Horizontal Steel Spacing
    ICC 600
    ICC Code
    Infill
    In-plane
    Insulation
    Integral Waterproofing
    Interlocking Pavers
    Intermediate
    Intersecting Walls
    Job Requirements
    Jobsite
    Joint Reinforcement
    Light-weight
    Masonry
    Masonry Construction
    Masonry Details
    Masonry Insulation
    Masonry Websites
    Masonry Workmanship
    Max Bar Size
    Missile Impact
    Mortar
    Mortar Joints
    Net Area Strength
    Out-of-plane
    Perm
    Pnnl
    Psi
    Rebar
    Reinforcement
    Residential
    R Value
    Safety
    Setting Pavers
    Shear Walls
    Shrinkage
    Slip Joints
    Sound Insulation
    Sound Transmission
    Split-face Block
    STC Rating
    Sticky Stone
    Stucco
    Stucco Bonding
    Stucco Over Lath
    Table 2
    Thin Veneer
    Tie Beams
    TMS
    TMS 402/602
    Tyvek
    UL
    UL Labeling
    Vapor Barrier
    Vertical Steel
    Vertical Walls
    Videos
    Wall Bending
    Wall Design
    Wall Tolerances
    Water Intrusion
    Waterproofing
    Water Vapor
    Wind

    Archives

    May 2024
    April 2024
    March 2024
    March 2022
    February 2022
    January 2022
    October 2021
    August 2021
    June 2021
    May 2021
    April 2021
    March 2021
    February 2021
    October 2020
    September 2020
    August 2020
    July 2020
    May 2020
    March 2020
    February 2020
    January 2020
    December 2019
    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018

    RSS Feed

Masonry Resources

Clay Brick Masonry
Concrete Masonry
Mortar & Grout
Reinforcing Steel
Sustainability & LEED
Wall System Comparisons


MAF Websites

​Find out more about Masonry
​Pre-Apprentice Programs by visiting:
www.MasonryEducation.org
Picture
Masonry Association of Florida, Inc. |PO Box 24474 , Fort Lauderdale, FL 33307
Copyright  ©  2017. All Rights Reserved.
Sitemap
  • News
  • Knowledge Base
  • FloridaMasonry.com
  • CWFN Home