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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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  1.  
    This is probably an obvious question, but I thought I'd better check and benefit from the wisdom on here. I'm doing the internal framing, but just wanted to check the size of the frames for the doors. Say I'd like doors that are 800 x 2100mm. The liners are 30mm. Should I make the 'hole' 870 x 2135? Is leaving a 5 mm gap? Or should I go further?
    • CommentAuthortony
    • CommentTimeAug 5th 2017 edited
     
    It depends how good you are! We used to hang the door in the frame first with a 21mm gap under the smallest side, 4mm to latch side.

    Build the frame round that, take the door off immediately.

    For masonry we used to fit the linings 10mm too wide for the door, head level, again set for nice gap under so no planering for carpets, hang the door after plastering and use fighting men wedges to adjust the gaps to perfect.
  2.  
    Thanks Tony! It occurs to me that if it's timber internal framing, why do we need a liner?
  3.  
    Posted By: tonyIt depends how good you are! We used to hang the door in the frame first with a 21mm gap under the smallest side, 4mm to latch side.

    Sorry Tony, I'm being dense. What does 'gap under the smallest side' mean?
    • CommentAuthortony
    • CommentTimeAug 5th 2017
     
    :) the floor is never level
  4.  
    Ah! Good point.
    •  
      CommentAuthordjh
    • CommentTimeAug 5th 2017
     
    Posted By: ComeOnPilgrimThanks Tony! It occurs to me that if it's timber internal framing, why do we need a liner?

    Because usually there is plasterboard on the studwork and the lining covers both the stud, which can be ugly, and the edge of the plasterboard, which definitely is ugly. The lining also provides the mounting point for the architrave, if you're planning to have them.

    A gap beween the lining at the head of the door and the noggin/lintel above it is useful if you're planning to use it as a concealed air vent.
  5.  
    Thanks @djh! If it's a fire door, I guess it provides a place to mount the intumescent seals as well.
  6.  
    As ever, I wish I could draw cartoons. Perhaps I get a different mental image from other people when I see reference to intumescent seals? Likewise the hymn which exhorts the Lord to 'set a seal upon my lips'... Sounds most uncomfortable.
    • CommentAuthorowlman
    • CommentTimeAug 6th 2017 edited
     
    Yeah; all puffed up and pompous and when they get together with their near cousins the floor seals, you better watch out. You wont be able to breathe for them.:bigsmile:
  7.  
    Thanks Owlman!
  8.  
    Posted By: Nick ParsonsPerhaps I get a different mental image from other people when I see reference to intumescent seals?

    Wasn't that a sort of running gag in ISIRTA? :bigsmile:
    Or maybe I'm thinking of something else?
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