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SHERW/N-W/LLIAMSs <br />~ w~ Protective & Marine Coatings <br />Scott Davis <br />Protective Coatings Representative <br />3820 Forsyth Park CouA <br />Winterville, NC 28590 <br />(919)795-6480 <br />(919) 882-9778 f <br />January 3, 2012 <br />Ellen Weinstein <br />Weinstein Friendlein Architects <br />601A West Main Street <br />Carboro, NC 27510 <br />Re: Orange County Animal Shelter <br />Concrete Block Wall System <br />Dear Ms. Weinstein, <br />This letter is in regards to our meeting today at the above referenced site. The <br />waterbased epoxy appears to be peeling down to the block filler applied during <br />construction. Possible causes include coating the block before too early <br />(moisture) and / or use of a filler that is not capable of handling the regular <br />washdowns. These walls also see regular physical abuse from the animals. <br />Below I will list two options or recommendations for application of a high <br />performance wall system. I highly recommend applying a"test" wall to evaluate <br />the stability of the existing system since this would be left in place in this <br />scenario. The removal of the current applied system would be costly and require <br />blasting which could damage the block. If total removal is desired, the surFace <br />would be sandblasted to remove existing coatings and the High Performance <br />System listed in the spec for other parts of the building could be used. <br />Option 1: Wall Resurfacinq - Trowel Epoxv (Smooth Finish) <br />Surface Preparation <br />Thoroughly pressure wash to remove contaminants and loose coatings. Abrade <br />the surFace thoroughly with power sanding to dull sheen and create a mechanical <br />profile. Wipe dust free. <br />Coatings <br />Wall Surfacing: 3513 Epoxy Smooth Mastic <br />Skim tooled mortar joints and allow to set 4-6 hours. Apply <br />by trowel at 1/16-1/8 as needed to smooth walls. Allow to <br />cure 12 hours minimum. <br />Intermediate: Polysiloxane XLE-80 at 3.0-5.0 mils DFT <br />Sealcoat: Polysiloxane XLE-80 at 3.0-5.0 mils DFT <br />