Orange County NC Website
Browse       Search
OC DSS -Hillsborough Commons Skylight Replacement Smith Sinnett / 2020054 <br />Hillsborough, NC Orange County <br /> <br />NON PERMEABLE AIR AND VAPOR BARRIERS 07 27 00 - 6 <br />a. Apply sealant along the butt joint and trowel smooth to form a continuous layer over the <br />joint extending 1/2 inches on both sides to a uniform thickness of 1/8 inch thick. <br />2. Seal gaps and voids or irregular joints greater than ¼ inch between panels of exterior grade <br />gypsum, gypsum sheathing, plywood, OSB or cementitious panels with a strip of self-adhered <br />air/vapor barrier transition membrane lapped a minimum of 1-1/2 inches on both sides of the joint. <br />a. Prime surfaces as per manufacturers’ instructions and allow to dry. <br />b. Align and position self-adhering air/vapor barrier transition membrane, remove protective <br />film and press firmly into place. Ensure minimum 2 inches overlap at all end and side laps <br />of membrane. <br />c. Roll all laps and membrane with a counter top roller to ensure seal. <br />3. Alternately, joints not exceeding 1/8 inch can be sealed with yellow open weave glass fabric. <br />a. Apply yellow open weave glass fabric centered over joint followed by a 1/8 inch (120mils) <br />thick trowel application of air/vapor barrier membrane. <br />b. Allow to dry prior to application of primary air/vapor barrier membrane. <br />B. Inside and Outside Corners <br />1. Seal inside and outside corners of sheathing boards with a strip of self-adhering air/vapor barrier <br />transition membrane extending a minimum of 3 inches on either side of the corner detail. <br />2. Prime surfaces as per manufacturers’ instructions and allow to dry. <br />a. Align and position self-adhering transition membrane, remove protective film and press <br />firmly into place. Ensure minimum 2 inches overlap at all end and side laps of membrane. <br />b. Roll all laps and membrane with a counter top roller to ensure seal. <br />C. Crack Treatment – Masonry and Concrete <br />1. Seal cracks over 1/16 inches in masonry and concrete with a strip of self-adhering air/vapor barrier <br />transition membrane lapped a minimum of 1 1/2 inches on both sides of the crack. <br />a. Prime surfaces as per manufacturers’ instructions and allow to dry. <br />b. Align and position self-adhering air/vapor barrier transition membrane, remove protective <br />film and press firmly into place. Ensure minimum 2 inches overlap at all end and side laps <br />of membrane. <br />c. Roll all laps and membrane with a counter top roller to ensure seal. <br />2. Alternately, static cracks 1/16 inch to 1/8 inch can be sealed with primary air/vapor barrier <br />membrane. <br />a. Fill crack with primary air barrier membrane. <br />b. Allow to dry prior to application of primary air/vapor barrier membrane. <br />D. Transition Areas <br />1. Tie-in to structural beams, columns, floor slabs and intermittent floors, parapet curbs, foundation <br />walls, roofing systems and at the interface of dissimilar materials as indicated in drawings with <br />self-adhered air/vapor barrier transition membrane. <br />a. Prime surfaces as per manufacturers’ instructions and allow to dry. <br />b. Align and position self-adhering air/vapor barrier transition membrane, remove protective <br />film and press firmly into place. Provide minimum 3 inch lap to all substrates. <br />c. Ensure minimum 2 inch overlap at all end and side laps of membrane. <br />d. Roll all laps and membrane with a counter top roller to ensure seal. <br />E. Window and Rough Openings <br />1. Wrap rough openings with self-adhered membrane as detailed. <br />a. Prime surfaces as per manufacturers’ instructions and allow to dry. <br />b. Align and position self-adhering air/vapor barrier transition membrane, remove protective <br />film and press firmly into place. Ensure minimum 2 inch overlap at all end and side laps of <br />membrane. <br />c. Roll all laps and membrane with a counter top roller to ensure seal. <br />F. Through-Wall Flashing Membrane <br />1. Apply through-wall flashing membrane along the base of masonry veneer walls and over metal <br />shelf angles as detailed. <br />a. Prime surfaces and allow to dry, press membrane firmly into place, over lap minimum 2 <br />inches at all end and side laps. Promptly roll all laps and membrane to ensure the seal. <br />b. Applications shall form a continuous flashing membrane and shall extend up a minimum of <br />8 inches up the back-up wall. <br />DocuSign Envelope ID: 51195338-6F17-4D2B-B990-4A82329E7F4E