Lead Lined doors & frames.

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20 Mar 2019 20:26 #13 by SteveB
While lead lined hollow metal doors are available, it's much more common to use a wood door. 1/16" thick lead is "standard", which is 2 pieces of 1/32" lead either side of the wood door core. 1/8" ( 2 pieces 1/16" ) is also used quite often. Common options range from 1/32" to 1/8". Doors will remain 1 3/4" thick with up to 1/8" lead in them. Over that and the door thickness starts to increase so you need a special frame for a non standard thickness door in this case. You can go as thick as 3/8" lead but lead this thick will be put in the center of the door as 1 piece. Lead in hollow metal doors is most always put in the center of the door (no matter the thickness) with steel stiffeners holding it in place.

Use a hollow metal frame with a jamb depth of at least 6" (5" throat). A standard stud wall has 3 5/8" studs with 5/8" drywall each side giving you 4 7/8" but you will also have 1/8" lead in the wall for a total of 5".

It's a good idea to use pivots instead of hinges due to the weight of the door. The Rixson L147 set (includes top & bottom pivot) along with an ML19 intermediate pivot is a good example. Use 2 intermediate pivots if the door is over 7'0".

You'll want a lead lined lock as well. The Schlage L series mortise lock, Corbin Russwin CL3300 series cylindrical lock, Best 8K or 9K cylindrical locks, as well as many others all have this option.

If you use a closer you'll want a lead lined full cover with it and use a lead lined astragal at pairs of doors. Lead thresholds or shielded door sweeps are required at the bottom of the door when a gap is 1 inch or more between the bottom of the door and the floor.

Now if you are renovating a hospital or a doctor's office you know what to look for on the x-ray room openings!

Steve Behrens
https://www.commdoor.com/
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