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H.

Where second layer of gypsum board occurs over lead-laminated gypsum board, comply with “Section 09 29 00 - Gypsum Board” for application of second layer.

3.3

LEAD-LAMINATED PLYWOOD

A.

Comply with manufacturer's recommendations.

B.

Adhere lead strips on face of studs at joints in lead-laminated plywood, including inside and outside corners.  Use 2 inches (50 mm) wide strips by same thickness as sheet lead laminated on plywood.

C.

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

D.

Lead Angles:  Install lead angles per manufacturer's recommendations.

E.

Install lead-laminated plywood 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 protection.

3.4

INSTALLATION OF DOORS AND FRAMES

A.

Lead-Lined Frames:  Install lead-lined steel door frames in accordance with “Section 08 11 13 - Hollow-Metal Doors and Frames.”  Comply with NAAMM HMMA 840 unless otherwise indicated.  Set frames accurately in position, plumb, and braced securely until permanent anchors are set.

1.

Secure door frames with steel stud anchors if lead lining is below 1/8 inch (3 mm) thick.

2.

Door Frame Supports (utilize if lead thickness is 1/8 inch (3 mm) or greater):

a.

Run steel angle supports full height on each door frame jamb and fasten to structure above.

b.

Spot-weld supports at 6 inches (152 mm) along jambs and at corners of jambs and head frame.

c.

Anchor frame to substrate with fasteners appropriate for substrate.

d.

Apply coat of asphalt mastic or paint to lead lining in door frames where lead will come in contact with masonry or grout.

3.

Provide 3 anchors per jamb, located adjacent to hinge on hinge jamb, and at corresponding heights on strike jamb.

4.

In metal stud construction, use wall anchors attached to studs with screws.

5.

Lap lead lining of frames over lining in walls at least 1 inch (25 mm).

6.

Lead Lining of Frames:  Line inside of frames with lead of thickness not less than that required in doors and walls in which frames are used.  Form lead to match frame contour, continuous in each jamb and across head, lapping stops.  Form lead shields around areas prepared to receive hardware.  Lap lining over lining in walls at least 1 inch (25 mm).

B.

Lead-Lined Wood Doors:

1.

Install lead-lined wood doors in accordance with “Section 08 14 16 - Flush Wood Doors” unless otherwise indicated

2.

Install doors in frames level and plumb, aligned with frames and with uniform clearance at edges.

C.

Hardware:  Line covers, escutcheons, and plates to provide effective shielding at cutouts and penetrations of frames and doors.  Refer to “Section 08 71 00 - Door Hardware” for other installations requirements.

D.

Touch up damaged finishes with compatible coating after sanding smooth.

RADIATION PROTECTION13 49 00 - 11

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