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  1. #1
    Join Date
    Mar 2007
    Location
    Oregon
    Posts
    2,365

    Default any idea what this is?

    Black plastic weep screed/mesh like material (facing outward) with a fabric material behind it installed beneath every foundation vent throughout the crawl space? The house was built in 2006. I've never seen anything even close before. I can think of no purpose.....

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  2. #2
    Join Date
    Oct 2010
    Location
    Southwest US
    Posts
    585

    Default Re: any idea what this is?

    Just a guess, but maybe an attempt to keep water from infiltrating through the foundation walls below vent wells? Or maybe channel it under the vapor barrier?


  3. #3
    Join Date
    Nov 2011
    Location
    Oregon, USA
    Posts
    333

    Default Re: any idea what this is?

    That's the stuff usually used on exterior foundation walls (don't know the name, someone will be along shortly to tell us) to allow exterior groundwater to flow down the walls' surface to the foundation footing drains, instead of allowing excess pressure to build up against the walls from saturated soil.

    Previous owner probably thought it would hide the water leaking in from the window wells.


  4. #4
    Join Date
    Feb 2008
    Location
    Caledon, Ontario
    Posts
    5,005

    Default Re: any idea what this is?

    Since these are crawlspace vents and likely left open, the dimpled membrane is placed to catch any rain water that comes through the vents and direct it to the floor.


  5. #5
    Join Date
    Mar 2007
    Location
    Muncie, Indiana
    Posts
    78

    Default Re: any idea what this is?

    The plastic material is used as a drainage plane that directs the water underneath the moisture barrier installed on the crawl space floor.
    I've never seen it used on a vertical wall though. Usually seen as a subfloor material or used as a drainage plane material for a basement perimeter drain system that directs the water to the sump system.


  6. #6

    Default Re: any idea what this is?

    The materials shown in your photos are used as just one step in many basement waterproofing systems. I am not sure the name of the materials shown are but it is a type of drainage board and the use shown is just for show.

    Jeff Zehnder - Home Inspector, Raleigh, NC
    http://www.jjeffzehnder.com/
    http://carolinahomeinspections.com/

  7. #7
    robert stockmann's Avatar
    robert stockmann Guest

    Default Re: any idea what this is?

    It's a drain mat material, AKA as Delta Drain Mat System, used primarily on exterior foundation waterproofing systems. It appears that in this application, they have used it to direct excess surface water entering the crawlspace vents, and directed the excess flow underneath the moisture barrier. They should have changed the grade on the exterior or used crawlspace culverts attached to the exterior. I would recommend you to look at your findings of the exterior drainage conditions further


  8. #8
    Join Date
    Jun 2010
    Location
    West Chester PA
    Posts
    166

    Default Re: any idea what this is?

    inadequate attempt at a waterproofing repair....


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