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I'm considering making a well insulated interior door and need to understand the door thickness implications for the getting a door knob. The door could be upto 3" thick - less if getting a door knob becomes a problem. I'd like to use a cheap off the shelf knob - possibly adding extensions.

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    Did you do any research before asking a question here? I did a web search for "door knob for thicker doors" and came up with many options, including extension kits and knobs for thicker than normal doors. Hinges and functionality of a door that thick is another problem to be addressed. – Alaska Man May 21 '18 at 18:01
  • I did, hence my suggestion of extension, but didn't really understand the options. Is this all I need to adapt one? handlesets.com/thick-door-kits/c8599 – pathfinder May 21 '18 at 18:41
  • visit a hardware store that sells door handle sets .... see what they offer – jsotola May 21 '18 at 20:45
  • @jsotola - thank you for the tip, but why waste an hr or 2 and gasoline when then is a community of creative people with great ideas. – pathfinder Nov 26 '18 at 16:59
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A standard lockset could be inset into the face of the door, so that 95% has full insulation. You will also need to consider hinge screw locations in the edge of the door.

  • You're suggesting recessed door handles? – pathfinder May 22 '18 at 17:42
  • I.e. putting some of your insulation proud of the door handle surface, except where it interferes with the handle. It's not even an inconvenience if you are using lever handles. – Harper May 23 '18 at 4:39
  • Was definitely over thinking the problem. I've now have a hollow core door and have attached rigid insulation except near the door handle. At some point, I might cover the insulation w/lauan - but this was simple and cheap enough. – pathfinder Nov 26 '18 at 17:04

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