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A.

Lead Discs:  5/16 inch (8 mm) diameter lead discs for use with screw heads.

B.

Lead Strips:  2 inches (51 mm) wide, unless indicated otherwise, by same thickness as sheet lead laminated on gypsum board.

C.

Lead Angles:  Leak-proof, lead angle system providing complete coverage of gamma rays used in lieu of lead strips and lead discs where sheet lead thickness is greater than 1/8 inch (3 mm) thick.

D.

Gypsum Board Fasteners:  

1.

Screw Fasteners for Metal Framing:  Type S, bugle head drill screws complying with ASTM C 954, length as required, for applying lead-laminated gypsum board to light gage metal framing having thickness of 0.033 to 0.112 inch [0.84 to 2.84 mm] thick.

2.

Screw Fasteners for Metal Framing - Self Tapping:  Type S, bugle head self-piercing tapping screws complying with ASTM C 1002, length as required, for applying lead-laminated gypsum board to light gage metal framing having thickness of 0.033 to 0.112 inch [0.84 to 2.84 mm] thick.

3.

Screw Fasteners for Wood Framing:  Type W, bugle head screws complying with ASTM C 1002, length as required, for applying lead-laminated gypsum board to wood framing and furring.

E.

Adhesive:  Acceptable to radiation protection product manufacturer and capable of adhering lead sheets where required.

F.

Tie Wire:  Leaded steel, annealed.

PART 3 -

EXECUTION

3.1

EXAMINATION

A.

Verify that existing framing, surfaces and substrates are ready to receive work and opening dimensions are as indicated on Shop Drawings or as instructed by the manufacturer.

B.

Do not proceed until unsatisfactory conditions have been corrected.

3.2

INSTALLATION OF LEAD-LAMINATED GYPSUM BOARD

A.

Comply with manufacturer's recommendations.

B.

Lead Strips:  Adhere lead strips on face of studs at joints in lead-laminated gypsum board, including inside and outside corners.  Use 2 inches (51 mm) wide strips by same thickness as sheet lead laminated on gypsum board.

1.

Lead strips are not required on 49” or greater lead sheet widths.

C.

Shim studs and other framing members as necessary to provide flat, flush finished surfaces.

D.

Install lead angles per manufacturer's recommendations.

E.

Install lead-laminated gypsum board on framing with screws spaced not more than 8 inches (203 mm) on center along edges of board and 12 inches (305 mm) on center in field of board.

F.

Adhere lead discs to fastener heads.  In each case, use method that provides continuous radiation shielding.

G.

Where lead-laminated gypsum board is final substrate, apply joint treatment on fasteners and joints per “Section 09 29 00 - Gypsum Board.”

RADIATION PROTECTION13 49 00 - 10

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