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OSB and Mold

           A big improvement over its waferboard predecesssor, oriented strand board (OSB) is a performance-rated structural panel engineered for uniformity, strength, versatility and workability. It is utilized internationally in a wide array of applications including commerical and residential construction and renovation, packaging/crating, furniture and shelving, and do-it-yourself projects.

        Because it is engineered, OSB can be custom manufactured to meet specific requirements in thickness, density, panel size, surface texture, strength, and rigidity. This engineering process makes OSB the most widely accepted and preferred structural panel among architects, specifiers and contractors. [from OSB Guide]

       Like all cellulose-based building materials, if OSB boards get wet, mold will enjoy eating the OSB.
 
       Q. First I’d like to say that I find your website very informational and I’m hoping to get some advice from you in regards to OSB removal vs. replacement.  Hopefully this will not ramble on for too long but I’m hoping with somewhat thorough information you may be better prepared to give me an honest answer.  I recently purchased a house that was over taken by mold.  I was told the previous owners of the house purposely opened a water valve in the basement to cause damage to the house since they were being foreclosed on.  I doubt this story is true because one I turned on the well I found a pipe that had split due to freezing and the odds were that it sprayed water directly on the forced air furnace.  This must have caused a huge steam bath and all of the rooms became moisture saturated for weeks, possibly months.  The house is a tri-level and every room had evenly distributed mold spots on every square foot of surface.  I may have made a mistake but I opted to not go with a professional mold remediation company since the damage was spread throughout the entire structure which to me, required a complete gutting of the house.  We opted for the masks and full clothing and removed everything from the house.  The basement was a complete loss but the upper floors had such little damage that cleaning and kills may have been an option for someone else.  The insulation on the upper floors was all nice and pink with no signs of mold getting passed the poly barrier, but I opted to remove it to be on the safe side.  Unfortunately the house has a fairly large crawl space.  The crawl space is very dry and shows no signs of water in the past.  The floor is cement and the space is conditioned with the HVAC system.  The problem is that when I was examining the above floor structure I found some light green mold dust on the 1x10’s and the osb which is the kitchen floor has light mold stains (light black spots) across much of the surface.  This brings me to my question (finally).  1) Should I try cleaning the osb with detergent?  2)Should I hire a professional since I am going to get one involved to ensure everything is a-ok before I start the rebuild process and see what options I have as for cleaning and sealing?  Or lastly, do I tear up and remove the flooring and rid the house of this last menacing piece of the damage?  I guess I would also like you opinion on the necessity of HVAC duct replacement.  I’m pulling the furnace and water heater and installing an air exchanger.  At this point should I replace the ducting also?  It is all galvanized and appears bright and shiny on the inside. [May 17, 2005]
        A. Thank you for your website compliment. If you can remove ALL of the mold growth from the OSB [flooring or otherwise] by such techniques as labor-intensive power planing, power grinding with a wire brush attachment, and power sanding, you might be able to save the OSB and avoid the huge expense and hassle of replacement. Of course, you will need to follow the 25 steps for safe and effective mold remediation at Mold Removal, including killing the mold prior to removal, and do fungicidal protection spraying afterwards. You can avoid replacing the duct work if it is of sheet metal construction with NO interior insulation to trap and hide mold infestation. Your description sounds like your home has this type of salvageable, cleanable ductwork. Hire a duct cleaning company to thoroughly scrub and clean the insides of all duct walls and to apply an EPA-approved fungicide [at least two separate spray or fog applications] inside all ducts, including both the return air duct and all supply lines to the various areas of your house. One very likely mold problem you have not yet addressed is the likely mold infestation growing INSIDE floors, walls, and ceilings. The abandoned situation of the house you bought, along with the substantial water damage, almost guarantees that there are going to be hidden mold infestations. You need to inspect all floors, walls, and ceilings internally with a fiber optics inspection device [buy one or hire a Certified Mold Inspector, plus internal floor/wall/ceiling mold testing of interior air samples. Learn more about mold inspection techniques.

 

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Mold Library Combination
Read the 5 mold advice ebooks in the Mold Library Combination, for a combined discount price of only $49.00 [$75.00 if bought separately]. Combo package includes: (a) Do-It-Best-Yourself Mold Prevention, Inspection, Testing, and Remediation, $15; (b) Mold Health Guide, $15; (c) Mold Legal Guide, $15; (d) Mold Home Remedy Recipes, $15; and (e) Mold Monsters, $15.  All helpful ebooks are delivered to your designated email address by email attachments only within 12-24 hours of your order. Order Now!

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