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It is recommended before securing lead to floor that a small sample area be done first to ensure adhesion with the varnish or sealant coating.
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Ensure the lead is free of bumps, air pockets or obstructions and lies completely flat.
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If laying sheet lead directly over existing concrete floor then coat fully cured concrete with a sealant like varnish to prevent chemical interaction between the concrete and lead and let the sealant or varnish fully dry. Additional concrete can be applied over the lead finishing. The Sheet Lead should extend up each wall a minimum of two inches. Ensure your sheet lead selection allows for safe & easy handling at the site and be sure to verify floor-loading limits are adequate with the architect. If multiple layers are to be used, stagger all joints between layers. Overlap at each joint between pieces or apply 2″ wide lead strip batten at each joint and glue in place. All joints should have a minimum of one inch overlap if multiple pieces are to be used. MarShield recommends whenever possible laying the sheet lead in the floor before the finished floor is poured. In certain situations, the floor and/or ceiling of your room may require radiation shielding.
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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.
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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.