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13 4900 Specification
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Lead Lined Gypsum Board / Drywall

Lead Lined Gypsum Board Download SpecificationsMAYCO lead-backed gypsum wallboard is furnished as 1/2" and 5/8"type “X” fire code gypsum board meetingclassificationASTM C 1396,withpureleadsheet,meetingfederal specification QQ-L-201F, Grade C, factory laminated to theback side of the gypsum panel.The lead extends 1” beyond one vertical edge of the lead lined gypsum board to allow for overlapping of joints thus alleviating the need for separate lead joint strips. Lead Strips are required at the corners. Lead Shielding accessories for installation include lead discs for screw download cad, rvt or rfa drawingspenetrations and sheet lead for backing and shielding of cut-outs for electrical, plumbing, medical gas or other penetrations.


48 inch Lead Lined Gypsum Board 48 inch lead lined gypsum biard with mounting in placeUL Classified
• Single unpierced layer of sheet lead
• Lead Lined Sheet is flush with the edge
• 2” Lead Batten Strips included for installation
• Uses Type S Bugle Head screw fasteners


49 inch Lead Lined Gypsum Board 48 inch lead lined gypsum biard with mounting in place
• Single unpierced layer of sheet lead
• Lead Lined Sheet has 1” Lip for overlap
• Uses Type S Bugle Head screw fasteners
For Specifications relevant to CSI Section 13 4900 (Radiation Shielding) Click Here

Lead Lined Gypsum Board

UL Classifed Fire Resistant

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Drywall Installation Instructions

Available in 47 3/4 inch (with strips) and 49 inch widths

Mayco lead lined Gypsum Board, also known as leaded drywall is constructed of a single rolled sheet of our own lead sheet, laminated to the drywall. Mayco supplies sheet lead to QQ-L-201 F, Grade C, in various thicknesses, depending on the levels of radiation your construction calls for. Most of our lead lined drywall is shipped as 5/8 inch think, although 1/2 inch Gypsum Board is available.

Gypsum Board sizes:

  • 4 ft X 8 ft
  • 4 ft X 9 ft
  • 4 ft x 10 ft
  • 4 ft x 12 ft
Lead Sheet Thickness
  • 1/32 in
  • 3/64 in
  • 1/16 in
  • 5/64 in
  • 3/32 in
  • 1/8 in

Download Spec Sheet (47 3/4 inch lead sheet) Download PDF          Download Spec Sheet (49 inch lead sheet)

Installation As shown above, the lead lined drywall should be attached to support studs every 12 inches horizontally and 8 inches vertically. When using 48 inch drywall 2 inch lead strips should be used on each of the support wall studs. This should be attached, glued, prior to installing wall board and provides suitable overlap where drywall sections meet.

All openings ( plugs, etc.) should be double lined with lead sheet. Drywall screws should be covered with lead discs (provided by Mayco).

Self-Adhesive Lead Tape

(Patent Pending) Mayco self-adhering lead tape (permanent adhesive) for sealing between and around our lead lined gypsum board.

Usage For Patent Pending Lead Tape

Use Mayco Double-Sided Adhesive Lead Tape for

  • Conduit Boxes
  • Corners
  • Seams
  • Any Other Openings
  • Rolls of up to 25 feet
  • 1/32" up to 1/8" Thick
  • 2" to 4" widths