Finish by gluing with a construction adhesive the lead buttons usually a minimum of a 7/8″ disk over each screw head. For drywall/Gypsum board or lath you may create a dimple over the screw head with a swing of your hammer head or other round ended tool to make a 1″ diameter impression. Screw drywall screws in deeper that normal into wall covering material slightly deeper than the thickness of the lead tab/disk or buttons been used. Spacing the screws at a maximum of 8″ on centre at the edges and a maximum of 12″ on centre at the intermediate studs. We suggest you use a minimum of 40 screws per 48″ x 84″ sheet. Fastened to the wooden or metal studs, using proper drywall screws of the correct length. Sheet lead over 1/16″ thick should have a minimum 2″ overhang. Extend lead overhang at least one inch into all frames or openings. A minimum lead overlap of one inch is required at all joints and corners. Drill pilot holes as necessary to prevent deformation of fastener, lead or distortion of board. Material must be in a vertical position with joints running from floor to ceiling as required by standards. Install leaded side of drywall/gypsum board, lath or plywood that will be used to cover the sheet lead against wooden or metal studs ensuring that you match the joints of the sheet lead used. 1/2″ thick drywall is available but not recommended. The drywall/gypsum boards are available in a minimum size of 4′ x 8′ to a maximum 4′ x 10′ x 5/8″ minimum thickness. A recommended thickness of a single un-pierced sheet of lead in any chosen length is applied and bonded to the appropriate length of drywall/gypsum board. Lead lining should be from 1/32″ – 1/16″ and if necessary 1/8″, although not recommended due to the heavy weight and handling.
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We start out by using only fire code gypsum materials for all lead-lined drywall/gypsum products.