Johns Manville 1.2 in. LWC Pre-Assembled Base Sheet Fasteners, Carton of 1,000

Johns Manville 1.2 in. Lightweight Insulating Concrete (LWC) Pre-Assembled Base Sheet Fasteners anchor base sheets over lightweight insulating concrete roof decks in JM commercial roofing systems. Each carton contains 1,000 fasteners. They are FM Approved and Miami-Dade County Approved for code-governed assemblies.

Key Features:

• 1.2 in. length: Sized for fastening base sheets into shallower lightweight insulating concrete decks.
• Pre-assembled: Pre-assembled design speeds base sheet attachment on the roof.
• Bulk carton: Carton of 1,000 fasteners supports large commercial reroof projects.
• FM Approved: FM Approved for specified roofing assemblies.
• Miami-Dade approved: Miami-Dade County Approved for demanding coastal jurisdictions.
• JM system component: Part of the JM fasteners and plates line for JM commercial roofing systems.

Specifications Table:

Coverage & How Much You Need:

Coverage is governed by the base sheet fastening pattern in your JM assembly specification rather than the carton. Estimate fasteners required by multiplying the specified density by roof area; this carton supplies 1,000 fasteners.

Fit and Compatibility:

Designed for base sheet attachment over lightweight insulating concrete in Johns Manville bituminous roofing systems; choose the 1.2 in. or 1.7 in. length per your LWC deck depth and JM’s data sheet. Base sheets and other system components are sold separately.

Frequently Asked Questions (FAQ):

Q: What is included?
A: One carton of 1,000 pre-assembled 1.2 in. LWC base sheet fasteners.

Q: When do I choose the 1.2 in. versus 1.7 in. size?
A: Select the length specified in your JM assembly for your LWC deck thickness; the 1.2 in. fastener suits shallower LWC depths.

Q: Are they code approved?
A: Yes, they are FM Approved and Miami-Dade County Approved.

Q: What do they fasten?
A: They anchor base sheets over lightweight insulating concrete decks in JM commercial roofing assemblies.

Q: How many cartons do I need?
A: Determine the fastener density from your JM specification, multiply by roof area, and divide by 1,000 per carton.

Q: How are they installed?
A: Install per JM’s LWC base sheet fastener data sheet, placing fasteners per the specified pattern and embedment depth.

Expert Verdict Reviewed by the SuperArbor Pro Desk

The 1.2 in. length is the right choice when your LWC deck profile is shallower and the JM assembly calls for shorter embedment. Always confirm deck thickness on site before ordering, since the 1.2 in. and 1.7 in. sizes are not interchangeable in specifications. Follow the fastening pattern in your FM or Miami-Dade approved JM assembly and pair with JM base sheets and plies per the system. Overdriving in soft LWC reduces holding power, so set fasteners to the specified depth.

Base sheet installation over concrete decks involves work at height and fastening tools, so follow JM installation guidance, fall-protection requirements, and local building code.

Order the Johns Manville 1.2 in. LWC Pre-Assembled Base Sheet Fasteners, carton of 1,000, for shallower LWC deck applications.

Product Documents:

• Installation Guide (PDF)
• Product Data Sheet (PDF)