09 Jan. 1983|
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MarShield’s plywood is laminated with sheet lead that is designed to cover necessary surfaces or walls in a room requiring radiation shielding.
Lead-laminated to plywood is applied in 48” widths on equal plywood widths up to 96” lengths. Buy nails that are long enough to completely poke through the sheathing; the length will depend on how thick the roofing is and how many layers of roofing there are.
Thick roofing cement, which is either troweled on or applied with a caulk gun, is the most common type used in roofing. To save money, buy plywood in bulk with a group of amateur boatbuilders, or ask for slightly stained or damaged sheets of marine grade okoume. It is affixed to surfaces or walls ensuring a continuous layer of sheet lead, under the plywood, to a specified height.
The lead sheet is 99.9% pure or better of un-pierced virgin lead, free of dross, oxide inclusions, scale, laminations, blisters and cracks and is factory laminated to plywood panels.
Similar to leaded drywall, the installer will need to take into account the loss of shielding in all penetrations, seams and cut outs in the leaded plywood.
All panels will be affixed to heavy gauge metal studs sufficient to support the leaded plywood. I wanted to try and DIY, but I think it would be a lot better to have someone else repair the roof. Thirty-pound felt is twice as thick as 15-pound felt, making it more durable and less likely to wrinkle when you install it. Shielding will need to be added to all receptacle switches, fasteners penetrations and seams created when applying the leaded plywood.
In the majority of installation jobs the leaded plywood panels can be mounted directly to the metal studs with standard drywall screws. Leaded plywood panels may be used in the ceiling but may require additional support of fasteners to hold the panels to the ceiling.