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Thread: weep screeds

  1. #1
    Join Date
    Mar 2006
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    Taos, New Mexico
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    Default weep screeds

    Our state (New Mexico) is just enforcing a weep screed requirement. How are other people handling the detail below the screed? We are required to have rigid insulation on the foundation walls and/or use a foam block system. Our building style is "adobe" and we have always run the plaster to below the grade. Any suggestions would be appreciated

  2. #2
    Join Date
    Jun 2004
    Location
    Houston & Washington Texas
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    Default Re: weep screeds

    Quote Originally Posted by lefurgey
    Our state (New Mexico) is just enforcing a weep screed requirement. How are other people handling the detail below the screed? We are required to have rigid insulation on the foundation walls and/or use a foam block system. Our building style is "adobe" and we have always run the plaster to below the grade. Any suggestions would be appreciated
    That is a tough one, obviously the weep screed allows water to exit, and if it's below grade where does the water go? We are required to be 2" above a hard surface like a patio, and 4" above general grade.

    I've seen that adobe construction, are you using block construction or wood frame?

  3. #3
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    Taos, New Mexico
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    Default Re: weep screeds

    I am either using frame, adobe, rastra block or poured pumice. The difficulty is the same for all of the building materials. I can't leave the insulation unprotected but it seems a little odd to plaster up to the weep sceed.

  4. #4
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    Mar 2005
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    Kansas the land of oz!
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    757

    Default Re: weep screeds

    Put an off set in the wall and foundation / slab.
    Last edited by Stuccoman; 03-09-2006 at 07:08 AM.

  5. #5
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    Default Re: weep screeds

    Stuccoman:

    What is your technique used where your stucco meets a wood window frame? Do you stucco to the frame or put a piece of metal and stucco to the metal and then caulk between the metal and wood frame?

  6. #6
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  7. #7
    Join Date
    Jul 2004
    Location
    Phoenix, AZ
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    Default Re: weep screeds

    We're not alowed to stucco straight down the wall to below grade. Stucco can wick the moisture out of the ground and keep a damp condition.

    IRC 2003:

    703.6.2 Plaster.
    Plastering with portland cement plaster shall be not less than three coats when applied over metal lath or wire lath and shall be not less than two coats when applied over masonry, concrete or gypsum backing. If the plaster surface is completely covered by veneer or other facing material or is completely concealed, plaster application need be only two coats, provided the total thickness is as set forth in Table R702.1(1) .
    On wood-frame construction with an on-grade floor slab system, exterior plaster shall be applied in such a manner as to cover, but not extend below, lath, paper and screed .
    The proportion of aggregate to cementitious materials shall be as set forth in Table R702.1(3) .

    703.6.2.1 Weep screeds.
    Aminimum0.019-inch (0.48 mm) (No. 26 galvanized sheet gage), corrosion-resistant weep screed or plastic weep screed , with a minimum vertical attachment flange of 3 1/2 inches (89 mm) shall be provided at or below the foundation plate line on exterior stud walls in accordance with ASTM C 926. The weep screed shall be placed a minimum of 4 inches (102 mm) above the earth or 2 inches (51 mm) above paved areas and shall be of a type that will allow trapped water to drain to the exterior of the building. The weather-resistant barrier shall lap the attachment flange. The exterior lath shall cover and terminate on the attachment flange of the weep screed .
    Andre T.

  8. #8
    Join Date
    Jan 2005
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    Chelsea, MI
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    117

    Default Re: weep screeds

    There are two types of stucco applications that you need to clarify. Both are defined either in ASTM C926 or C1063. Both are referenced in the IBC and (kinda sorta) referenced in the IRC.

    The first application is the typical framed/sheathed, 2-felt, metal lath, control joint application. These can leak somewhat and require a weep screed at the bottom to drain water.

    The second is a CMU/masonry/concrete application. In these cases, the stucco has "intimate bond" with the surface. Although I have had officials require a weep screed in the past, there's nothing to leak and a weep screed would only weaken the stucco bond. Also, ASTM C1063 doesn't really apply to these applications.

    When you have a transition between framed/sheathed and a foundation you typically weep screed the framed portion and parge coat the foundation.

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