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5thWall Building Diagnostics Consultants Government Services Annex <br /> District Attorney Office <br /> Roof Replacement <br /> November 2009 <br /> PART 2 PRODUCTS <br /> 2 . 01 Sealants <br /> A . General : except as specifically directed otherwise by the Designer, use only the type of <br /> sealants described in the section . <br /> B . Sealant : Shall be low modulus, non- staining one-part urethane and of gun-grade <br /> consistency. Sealant shall be easily workable and shall be capable of producing a <br /> smooth attractive finish . For joints in vertical surfaces , provide ASTM C920 , Type S or <br /> M, Grade NS , Class 25 , Use NT . For joints in horizontal surfaces, provide ASTM C920 , <br /> Type S or M, Grade P, Class 25 , Use T . Color shall be approved by Owner . <br /> C . Sealant shall be Dynatrol I, by Pecora Corporation ; Sonolastic NP - 1 , by Sonneborn ; <br /> Sikaflex 201 , by Sika Corporation , or approved equal . <br /> 2 . 02 Back-up Materials <br /> A . General : Use only those back-up materials which are specifically recommended for this <br /> installation by the manufacturer of the sealant used, and which are non- absorbent and <br /> non- staining . Closed- cell back-up materials must be 1 / 8 inch larger in diameter than the <br /> width of the joint ; soft back-up materials must be 25 % larger in diameter than the width <br /> of the joint. <br /> Be Acceptable types include closed- cell, resilient urethane or polyvinylchloride foam , <br /> closed- cell, polyethylene foam ; closed- cell sponge of vinyl or rubber, or approved equal . <br /> C . Fire Rated Walls : Mineral wool or Ultra-Block as manufactured by Pecora. The wall <br /> shall have a minimum two hour rating . <br /> 2003 Cleaner : Shall be xylol , toluene, or commercial solvent recommended by the sealant <br /> manufacturer . <br /> 2 . 04 Primer : Shall be as supplied by sealant manufacturer. <br /> 2005 Miscellaneous Materials : All other materials not specifically described but required for complete <br /> and proper caulking and installation of sealants shall be first quality of their respective kinds, <br /> new, and as selected by the Contractor subject to the approval of the Owner. <br /> PART 3 EXECUTION <br /> 3 . 01 Examination <br /> A . Examine all areas and conditions under which work of this section will be performed . <br /> Be Correct conditions detrimental to the proper and timely completion of the work. Do not <br /> proceed until unsatisfactory conditions have been corrected . <br /> 09 -26 Sealants and Caulking <br /> 079200-2 <br />