Results 1 to 9 of 9

Thread: What is this?

  1. #1
    Join Date
    Mar 2007
    Location
    Tampa, Fl
    Posts
    155

    Default What is this?

    Really weird. White powder was on the joists but not on the bridging/blocking or subfloor in crawl speace. Not on the cut ends of the joists also.
    Saw some spots in the attic also. But not as much. First two pics are from attic area, last is from crawl space. Approximately 1955 construction. Anyone know what this is?

    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images
    OREP Home Inspector E&O Insurance

  2. #2
    Join Date
    Oct 2003
    Location
    Rockwall Texas
    Posts
    4,517

    Default Re: What is this?

    Did you happen to probe at it and see if it was decayed?

    Looks like what is known as white rot fungi.

    More info from the web:

    When White Rot Fungi attacks wood, it breaks down both the lignin and cellulose causing the wood to lose its color and appear whiter than normal. Wood affected by white rot normally does not crack across the grain and will only shrink and collapse when severely degraded. Infested wood will gradually lose its strength and become spongy to the touch. Boards can become severly damaged in 6-12 months, and even faster under moist and hot conditions. White fungus rot most commonly occurs in hardwood materials but can be found in exterior columns, steps, porches, and decks, as well as in doors, windows, and door and window frames. Occassionally, it occurs in wood trim, rafters, joists, sheathing, siding, sills, joists, and subflooring.


  3. #3
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,741

    Default Re: What is this?

    This is just a guess,
    There is a product that contains boric acid, that is said to prevent termites and other WDI. You spray it on the lumber. It could have been applied befor the floor was down.
    Boric Acid natural insecticide, Dry Rot treatment

    Last edited by Rick Cantrell; 12-18-2007 at 05:36 PM.
    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  4. #4
    charles buell's Avatar
    charles buell Guest

    Default Re: What is this?

    I think that the third picture shows boards that were used as form boards and then re-used in the floor. Note the one with no "white" on it? This would also account for the very clean sub-floor.

    Last edited by charles buell; 12-18-2007 at 05:55 PM. Reason: wrong spelling

  5. #5
    Join Date
    Oct 2003
    Location
    Rockwall Texas
    Posts
    4,517

    Default Re: What is this?

    Rick,

    Your thinking of the product called Timbor.

    The only thing is when it is mixed and sprayed it is a clear material and not white as such and you'd probably never see it used as such in an attic space.


  6. #6
    Aaron Miller's Avatar
    Aaron Miller Guest

    Default Re: What is this?

    Quote Originally Posted by Rick Hurst View Post
    Rick,

    Your thinking of the product called Timbor.

    The only thing is when it is mixed and sprayed it is a clear material and not white as such and you'd probably never see it used as such in an attic space.
    Rick:

    Certified applicators in Texas are required to add a dye, commonly "Locate Blue" to Timbor, Bora-Care, et al. prior to application so that application can be verified.

    Aaron


  7. #7
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,741

    Default Re: What is this?

    Rick H, & Arron
    I've heard of those products before, but have not seen photos of them applied.
    Thanks for letting me know.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  8. #8
    Join Date
    Oct 2003
    Location
    Rockwall Texas
    Posts
    4,517

    Default Re: What is this?

    Aaron,

    I've never heard of such a requirement. Do you have knowledge of where I could obtain that information?

    I do know most of these companies that do the boron based treatments of the sill plates and studs during construction use the dye only for the contractor to know that they have been there. I don't think its an actual requirement by the state though. I just have never heard that it was a requirement at any of the training classes or ever received such notification from the SPCB.

    I personally don't do those type of treatments anymore though. The companies that do them are making like minimum wage per their bids, so I will let them have them.

    rick


  9. #9
    Mark Nahrgang's Avatar
    Mark Nahrgang Guest

    Default Re: What is this?

    Quote Originally Posted by charles buell View Post
    I think that the third picture shows boards that were used as form boards and then re-used in the floor. Note the one with no "white" on it? This would also account for the very clean sub-floor.
    I agree with Charles. The white is on specific pieces of lumber, and doesn't appear to be spreading to the floor or adjacent lumber. I think this is dirt or cement, that got on the boards prior to construction.

    I inspected a 30 year old home not too long ago that had muddy footprints on the underside of the floorboard. (Had a nice laugh with the buyers.)


Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •