--- type: page title: Lead Backed Drywall Architectural Spec 09 29 60 handle: lead-backed-drywall-architectural-spec-09-29-60 url: >- https://lead-glass-pro.myshopify.com/pages/lead-backed-drywall-architectural-spec-09-29-60 published_at: '2026-01-07T18:33:00.000Z' --- .csi-spec { font-family: Arial, sans-serif; line-height: 1.5; max-width: 900px; margin: 0 auto; padding: 20px; color: #111; } .csi-spec h1 { font-size: 22px; margin: 6px 0; text-align: left; } .csi-spec h2 { margin-top: 30px; font-size: 18px; text-transform: uppercase; } .csi-spec h3 { margin-top: 20px; font-size: 16px; text-transform: uppercase; } .csi-spec p { margin: 8px 0; } .csi-spec .note { border: 1px dotted #c00; padding: 8px 10px; margin: 10px 0; } .csi-spec .level-alpha { list-style-type: upper-alpha; margin-left: 24px; padding-left: 22px; } .csi-spec .level-1 { list-style-type: decimal; margin-left: 24px; padding-left: 22px; } .csi-spec .level-a { list-style-type: lower-alpha; margin-left: 24px; padding-left: 22px; } .csi-spec li { margin: 6px 0; } .csi-spec .section-end { margin-top: 30px; font-weight: bold; } [Click Here to Download the .Doc File](https://cdn.shopify.com/s/files/1/0013/7202/8986/files/09_29_60_Lead_Backed_Drywall_CSI_Spec.docx?v=1777040981) ------------------------------------------------------------------------------------------------------------------------------------------------------ SECTION 09 29 60 ================ LEAD-BACKED DRYWALL =================== GUIDE SPECIFICATION - 2026 ========================== \*\* NOTE TO SPECIFIER \*\* This section is written in CSI three-part format for lead-backed gypsum board radiation shielding assemblies. Edit bracketed requirements to coordinate with Drawings, wall types, ceiling conditions, fire-resistance-rated assemblies, and the project radiation shielding report prepared by the qualified health or medical physicist. This section is based on products of Lead Glass Pro, located at: 1968 South Coast Highway Laguna Beach, CA 92651-3681 Toll Free: (800) 506-9972 Email: sales@leadglasspro.com Web: https://www.leadglasspro.com Lead Glass Pro manufactures radiation shielding products including lead-backed drywall, lead-laminated gypsum board, lead-backed plywood, sheet lead, lead strips, lead discs, and related radiation shielding accessories. PART 1 - GENERAL ---------------- ### 1.1 SECTION INCLUDES 1. Lead-backed gypsum board for radiation shielding at walls and partitions. 2. Lead-backed gypsum board for radiation shielding at ceilings where indicated. 3. Sheet lead, lead strips, lead discs, lead sleeves, lead backing, fasteners, and accessories required to maintain continuous radiation shielding. 4. Coordination with fire-resistance-rated lead-lined assemblies where indicated. ### 1.2 RELATED SECTIONS 1. Section 06 10 00 - Rough Carpentry. 2. Section 09 21 16 - Gypsum Board Assemblies. 3. Section 09 90 00 - Painting and Coating. 4. Section 13 49 00 - Radiation Protection. ### 1.3 REFERENCES 1. ASTM International (ASTM): 1. ASTM B 749 - Standard Specification for Lead and Lead Alloy Strip, Sheet, and Plate Products. 2. ASTM C 1396/C 1396M - Standard Specification for Gypsum Board. 3. ASTM E119 - Standard Test Methods for Fire Tests of Building Construction and Materials. 2. Federal Specifications: 1. QQ-L-201F, Grade C - Lead Sheet, 99.9 percent pure. 3. National Council on Radiation Protection and Measurements (NCRP): 1. NCRP Report No. 49 - Structural Shielding Design and Evaluation for Medical Use of X-Rays and Gamma Rays of Energies up to 10 MeV. 2. NCRP Report No. 147 - Structural Shielding Design for Medical X-Ray Imaging Facilities. 4. National Fire Protection Association (NFPA): 1. NFPA 251 - Standard Methods of Tests of Fire Resistance of Building Construction and Materials. 5. Underwriters Laboratories (UL): 1. UL 263 - Fire Tests of Building Construction and Materials. 6. Comply with local radiation safety regulations and requirements of authorities having jurisdiction where more stringent than references listed above. ### 1.4 DEFINITIONS 1. Lead Equivalence: Thickness of lead that provides the required radiation attenuation under specified conditions. 2. Radiation Shielding Report: Project-specific shielding report prepared by a qualified health or medical physicist, indicating required lead thickness, shielding height, and details for penetrations and assemblies. ### 1.5 PERFORMANCE REQUIREMENTS 1. Provide lead-backed drywall assemblies with lead thickness and shielding height not less than indicated on Drawings and required by the project radiation shielding report. 2. Minimum Shielding Height: Provide 7 feet 0 inches (2134 mm) minimum lead height unless otherwise indicated by the project radiation shielding report or Drawings. 3. Maintain continuous radiation shielding at joints, corners, end joints, fastener penetrations, wall penetrations, ceiling penetrations, and transitions to adjacent shielded assemblies. 4. Where fire-resistance-rated assemblies are indicated, provide lead-backed drywall products and installation methods acceptable for the required rated assembly. ### 1.6 SUBMITTALS 1. Product Data: Submit manufacturer's printed data for lead-backed drywall, sheet lead, lead strips, lead discs, fasteners, accessories, storage requirements, installation instructions, and maintenance instructions. 2. Shop Drawings: Indicate panel layout, lead thickness, shielding height, joint locations, batten strip locations, fastener shielding, penetrations, ceilings, transitions, and coordination with adjacent construction. 3. Radiation Shielding Coordination: Submit documentation verifying that proposed lead thickness, height, and accessories comply with the project radiation shielding report. 4. Fire-Resistance Documentation: For rated partitions or ceilings, submit UL classification or other acceptable evidence of compliance with required fire-resistance-rated assembly. 5. Certificates of Compliance: Submit manufacturer's certificate stating that lead-backed drywall and accessories furnished for the Project comply with this Section, the Drawings, and the project radiation shielding report. 6. Installer Certification: Submit installer certificate stating that materials have been installed in accordance with this Section, manufacturer's instructions, the Drawings, and the project radiation shielding report. ### 1.7 QUALITY ASSURANCE 1. Manufacturer Qualifications: Manufacturer regularly engaged in successful production of radiation shielding materials and lead-backed gypsum board assemblies. 2. Installer Qualifications: Installer experienced in installation of lead-backed drywall and radiation shielding accessories. 3. Single Source Responsibility: Provide lead-backed drywall, sheet lead accessories, lead strips, lead discs, and related radiation shielding materials from Lead Glass Pro. 4. Regulatory Requirements: Comply with applicable OSHA requirements, building codes, radiation safety standards, environmental regulations, and requirements of authorities having jurisdiction. 5. Preinstallation Coordination: Coordinate lead thickness, panel size, support spacing, partition ratings, ceiling framing, penetrations, and access panels before fabrication and installation. ### 1.8 DELIVERY, STORAGE, AND HANDLING 1. Deliver materials in manufacturer's original packaging with labels intact and legible. 2. Store lead-backed drywall flat, indoors, and protected from moisture, direct sunlight, temperature extremes, and physical damage. 3. Keep panels flat until ready for installation to prevent warpage. 4. Handle panels carefully to prevent cracking, delamination, edge damage, and deformation. 5. Do not store materials in areas where moisture is present. ### 1.9 PROJECT CONDITIONS 1. Field Measurements: Verify framing, supports, openings, penetrations, and related conditions before fabrication and installation. 2. Environmental Conditions: Install materials only when building is enclosed and spaces are dry and ready to receive gypsum board. 3. Restrict access to work areas during installation of lead materials in accordance with applicable safety requirements. PART 2 - PRODUCTS ----------------- ### 2.1 MANUFACTURERS 1. Approved Manufacturer: Lead Glass Pro, 1968 South Coast Highway, Laguna Beach, CA 92651-3681; Toll Free: (800) 506-9972; Email: sales@leadglasspro.com; Web: https://www.leadglasspro.com. 2. Substitutions: Not permitted unless approved in writing by Architect, Owner, and project radiation physicist of record, and unless proposed materials demonstrate equal radiation shielding performance, fire-resistance compliance where required, and compatibility with specified assemblies. ### 2.2 LEAD-BACKED DRYWALL 1. Basis of Design: Lead-backed drywall, as manufactured and supplied by Lead Glass Pro. 2. Gypsum Board: 5/8 inch (16 mm) Type X gypsum board, ASTM C 1396/C 1396M, unless otherwise indicated. 3. Optional Gypsum Panels: Abuse Resistant, Mold Resistant, Water Resistant, and High Impact panels where indicated or required by project conditions. 4. Lead Sheet: Factory-laminated to back side of gypsum board under pressure; comply with Federal Specification QQ-L-201F, Grade C, 99.9 percent pure, and ASTM B 749, Type L51121. 5. Lead Thickness: Provide thickness indicated on Drawings and required by the project radiation shielding report. 6. Panel Size: Width and length as required for support spacing and handling; maximum 48 inches by 120 inches (1219 mm by 3048 mm). 7. Identification: Clearly label lead side of each board with lead thickness value. 8. Fire-Rated Assemblies: Where lead-backed drywall is used in fire-resistance-rated partitions, provide UL Classified products bearing proper UL labeling on the lead side and acceptable for the required rated assembly. ### 2.3 SHEET LEAD ACCESSORIES 1. Lead Strips: 2 inches (51 mm) wide, unless otherwise indicated, by same thickness and height as sheet lead laminated to gypsum board. 2. Lead Batten Strips: Provide at vertical joints, inside corners, outside corners, end joints, blocking, and other locations required to maintain radiation shielding continuity. 3. Lead Discs or Tabs: Provide at fastener penetrations where required to maintain equivalent radiation protection. 4. Penetration Shields: Provide lead sleeves, lead lining, lead backing, batten strips, or other shields of equivalent thickness to surrounding lead shielding at outlet boxes, junction boxes, ducts, conduit, piping, fixtures, diffusers, sprinklers, access panels, and similar penetrations. 5. Lead-Lined Access Panels: Provide where required to maintain continuous radiation protection at ceiling or wall access points. ### 2.4 FASTENERS AND RELATED MATERIALS 1. Fasteners: Type and spacing recommended by gypsum board manufacturer and compatible with framing, rated assemblies, and radiation shielding requirements. 2. Joint Treatment: Comply with Section 09 21 16 for taping, finishing, and preparation for finishes. 3. Accessories: Manufacturer's standard accessories required for complete installation while maintaining radiation shielding equivalent to the surrounding assembly. PART 3 - EXECUTION ------------------ ### 3.1 EXAMINATION 1. Examine framing, backing, blocking, openings, penetrations, ceiling supports, and adjacent construction for conditions affecting installation or radiation shielding continuity. 2. Verify studs for vertical wall applications are minimum 20 gage and spaced not more than 16 inches (406 mm) on center, unless otherwise approved by manufacturer and required by project structural design. 3. Verify ceiling framing is designed and installed as a hard-lid support system where lead-backed drywall ceilings are required. 4. Do not proceed with installation until unsatisfactory conditions have been corrected. ### 3.2 INSTALLATION - WALLS 1. Install lead-backed drywall in accordance with manufacturer's written instructions, approved shop drawings, applicable rated assembly requirements, and the project radiation shielding report. 2. Apply boards vertically with long edges parallel to supports and lead lining facing supports. 3. Provide blocking at end joints. 4. Install vertical lead batten strips at face of studs, supports, and blocking at vertical joints, inside corners, outside corners, and end joints. Use strips of same thickness and height as lead lining on gypsum board. 5. Secure gypsum board to supports with fasteners spaced as recommended by board manufacturer and required by rated assemblies. 6. Drive fasteners slightly below exposed surface without breaking face paper. Shield fastener penetrations with lead discs, tabs, internal 2 inch (51 mm) wide batten strips, or other method approved by the project radiation physicist of record. 7. Do not permit untrained persons or unrelated trades to occupy room or work area during installation of lead materials. ### 3.3 INSTALLATION - PENETRATIONS 1. Back each penetration in lead-lined walls with sheet lead of same thickness as surrounding wall shielding and with proper overlaps. 2. Where outlet boxes, junction boxes, ducts, conduit, piping, and similar items interrupt shielding, provide lead sleeves, lead lining, backing, or shielding of equivalent thickness to the surrounding partition system. 3. Coordinate penetrations before installation. Avoid unshielded cuts, gaps, and discontinuities in lead-backed drywall assemblies. ### 3.4 INSTALLATION - CEILINGS 1. Install lead-backed 5/8 inch (16 mm) drywall at ceiling areas where required to provide shielding for occupancy above and where indicated on Drawings or required by the project radiation shielding report. 2. Frame shielded ceilings as hard-lid assemblies. T-bar grids and suspended ceilings are not acceptable as radiation shielding support systems. 3. Provide ceiling framing at 12 inches (305 mm) on center, or closer spacing and framing size/gage as determined by project structural engineer, to support lead-backed drywall and prevent sagging. 4. Shield joints and penetrations in ceiling assemblies using the same principles specified for wall assemblies. 5. Provide lead backing, sleeves, lining, shields, and lead-lined access panels at light fixtures, HVAC openings, sprinklers, diffusers, ducts, access panels, and other ceiling penetrations as required to maintain continuous radiation protection. ### 3.5 FIELD QUALITY CONTROL 1. Manufacturer Certification: Upon completion of material supply, manufacturer shall furnish certificate of compliance stating that materials have been produced in accordance with this Section. 2. Installer Certification: Upon completion of installation, installer shall furnish certificate of compliance stating that materials have been installed in accordance with this Section, the Drawings, manufacturer's instructions, and the project radiation shielding report. 3. Radiation Shielding Testing: After X-ray equipment has been installed and placed in operating condition, but before occupancy and use, Owner will engage the project radiation physicist of record to test radiation shielding, unless otherwise indicated. 4. Correct deficiencies in radiation shielding Work identified by inspection or testing. ### 3.6 CLEANING 1. Collect lead trimmings, debris, and lead-containing materials as Work progresses. 2. Recycle or dispose of lead trimmings and lead-containing debris in compliance with applicable health, safety, and environmental regulations. 3. Do not dispose of lead or lead-containing materials in general trash or refuse. 4. Leave Work areas clean and ready for joint treatment and finishing specified in Section 09 21 16. ### 3.7 PROTECTION 1. Protect installed lead-backed drywall from moisture, impact, deformation, and damage by construction operations. 2. Protect completed lead shielding from unapproved penetrations. Do not mount equipment or accessories on lead-shielded assemblies without providing radiation shielding at penetrating fasteners. 3. Replace damaged panels and accessories that compromise appearance, performance, fire-resistance rating, or radiation shielding continuity. END OF SECTION