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Does Stucco Leak? Educational Slide Show

Does Stucco Leak? Educational Slide Show

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  • 1.
    • Leaks in Homes & Buildings are Expensive ….Sometimes Profoundly So
    • Leaks =
    • Property Damage
    • Mold
    • Lawyers
    • Litigation
  • 2.
    • Many times, when leaks in stucco
    • buildings are discovered,
    • “experts” conclude:
  • 3.
    • What Causes Leaks in Stucco Buildings?
    • Leaks can be caused by:
    • Roof Problems
    • Windows & Doors that are faulty
    • Penetrations through exterior walls - pipes, vents, electrical
    • Design problems – (sills without slope etc.)
    • “ The Gap” - between the penetrations and stucco
  • 4.
    • Doesn’t stucco leak??
    • The simple answer is:
    • NO!
    • Water In Liquid Form
    • Does Not Pass Through Stucco
  • 5.
    • Experts have been known to assert that Stucco allows water to pass through because “stucco is a sponge”.
    • This Is Not Correct………The Truth?
    • Moisture can be absorbed... very slowly into stucco, but “liquid water” cannot pass through and will not “leak” out the opposite side
  • 6.
    • Where’s The Proof that stucco doesn’t leak?
    • The Cylinder
    • The Blocks
  • 7.
    • The Cylinder
    A plastic cylinder is fabricated with 7/8” of conventional stucco installed as seen above. Only the edges of the stucco are sealed to prevent water passing in the gap between the stucco and plastic. The Stucco is the same sand and cement blend that is used universally in the industry.
  • 8. The stucco cylinder is filled with water. If stucco leaks, the water should flow out the bottom of the cylinder. Tests have shown that despite the uninterrupted presence of water, for periods in excess of 18 months, no water passes through the stucco. Stucco does not leak!
  • 9.
    • The Blocks
    Homes in the coastal areas of Florida are built with concrete block stem walls, for two purposes.: One: protection from termite damage and rot, and two: structural support for exposure to hurricanes. A recurring problem in Florida was that many times water was able to penetrate the block through voids and gaps in the system, especially when driven by wind. A test was commissioned by Florida Concrete & Products Association and the NCMA Education and Research Foundation to determine what would happen if the concrete blocks were coated with stucco and how that would impact the penetration of water, especially when driven by strong winds. They expected an improvement, but were pleasantly surprised with the findings.
  • 10. The Blocks
    • The purpose was to test for water penetration resistance of concrete masonry walls with varying thicknesses of stucco and various levels of workmanship of both the masonry and the stucco. This involved testing wall samples that were built 4 ft wide and 6 ft tall. The project was broken into two phases utilizing different wind pressures:
    • Phase I utilizing pressures representative of 62 and 110 mph winds
    • Phase II utilizing pressures representative of 155 and 180 mph winds
  • 11. The Blocks
    • Coating for the Test
    • The Blocks were coated with stucco of varying thicknesses (1/8”. 1/4 “ & 1/2”) In preparation for testing
  • 12.
    • The Blocks - Test Procedure
    • The walls were tested at 40.8 gallons per hour at wind velocity of approximately 62 mph for 4 hours. Then at 110 MPH for another 24 hours.
  • 13.
    • After 28 hours of testing, there was NO penetration of the block walls or dampness on the opposite surfaces of the walls. This was true even with the the block walls that were coated with only 1/8” of stucco.
    • This is convincing proof that:
    The Blocks
  • 14. Does Stucco Leak?
    • So if stucco doesn’t leak, why do stucco buildings leak?
    • Roof Problems and Penetrations can be the cause
    • Windows Can Leak (even doors sometimes)
      • Problems caused by design or manufacturing defects in the windows
    • Penetrations Can be the Source
      • Penetrating the stucco including structural, plumbing and electrical
    • The “Gap” Around Windows & Penetrations
      • the gap may look small and innocuous, but if not sealed, the gap can allow water to flow in, or be driven in by wind and/or capillary action
  • 15. Does Stucco Leak? What About Cracks In Stucco…… Do They Cause Leaks? Typical Cracking Seen In Virtually All Stucco Applications Do Not Allow Water To Pass. Significant Cracks (Those Large Enough To Allow The Edge Of A Nickel to Fit Inside) May Fully Penetrate The Stucco And Should Be Repaired To Prevent The Possibility Of Water Intrusion
  • 16.
    • The Bottom Line:
    • Leaks In Stucco Buildings Are Caused By:
    • Penetrations, Gaps, Windows, Doors, Roofs,
    • And Severe Cracks In The Stucco.
    • But Virtually Never By The Stucco Itself,
    • Because ………. Stucco Doesn’t Leak