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peajayach
Joined: 11 Apr 2009
Posts: 1
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 Posted: Sat Apr 11, 2009 11:16 am Post subject: undercut fire rated doors |
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| Undercut is the distance between the bottom the door and the bottom of the frame. Doors can undercut to provide clearance above the finish floor material. For fire-rated doors/frames NFPA allows a maximum undercut of 3/4", thus if there is finished floor material under the door, such as a 1/2 inch metal threshold or stone, etc., there would be a clearance of 1/4"...but a 3/4" undercut. |
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