Does a mortise thumb latch go above or below the door knob?

threeapplesOctober 23, 2012

I have no idea why I'm second-guessing myself, but don't want to tell the carpenter the wrong thing for when he preps the doors. thanks.

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millworkman

goes above the door knob.

    Bookmark   October 23, 2012 at 8:04PM
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gbsim1

It depends on the locks that you have.
I've been used to above the knob, however our multi point French doors require that the thumbturn be below the knob.

    Bookmark   October 23, 2012 at 11:04PM
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renovator8

In a mortise set the thumb turn would be part of the whole unit so a carpenter would not have a choice.

    Bookmark   October 24, 2012 at 4:50AM
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threeapples

This is a separate thing from the knob. We are doing these on some doors for privacy.

    Bookmark   October 24, 2012 at 7:59AM
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millworkman

Interior privacy I would probably go with beneath the knob. I was thinking of exterior like a deadbolt when I said above.

    Bookmark   October 24, 2012 at 8:04AM
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renovator8

If you mean a mortise privacy bolt with a thumb turn as linked below, it should go above the latching hardware for easy use.

This is not a "latch"; it is a manual locking bolt and is not considered "privacy" hardware because it cannot be unlocked from the other side with a tool in an emergency. You should not put one on a child's door or a bathroom.

Here is a link that might be useful: mortise privacy bolt with a thumb turn

    Bookmark   October 24, 2012 at 9:22AM
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renovator8

Here is a thumbturn deadbolt lock with an emergency release button.

Here is a link that might be useful: thumbturn bolt w/ emergency release

    Bookmark   October 24, 2012 at 9:28AM
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threeapples

ours looks similar to the first one you posted, Renovator, and the hardware company said you can open it from the exterior. the hardware company said it should go below the interior knobs so it doesn't look like a deadbolt.

i believe athensmom said she has these on her kids doors and you can get in from the outside.

    Bookmark   October 24, 2012 at 9:58PM
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renovator8

It IS a dead bolt so if that is something you don't want to see your decision has already been made. I would put it where I could see if it was locked or unlocked.

    Bookmark   October 25, 2012 at 12:11AM
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athensmomof3

Ours is above the door knob. I think it would be hard to see/use if it was below. Ours you can get in from the outside. There is a brass panel that snaps off if you get a fingernail under it.

Here are ours:

We have a small knob and rosette. If your knob is larger or you have a larger backplate I would definitely do above the knob.

    Bookmark   October 25, 2012 at 8:13AM
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brickeyee

Classically above the knob, with no access from outside the room.

And we all survived hundreds of years that way.

Interior doors are not all that solid, and the bolt throw barely makes it into the door casing.

The are easily broken through in an emergency

    Bookmark   October 25, 2012 at 9:06AM
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threeapples

Thanks for the photo, athensmom. What are your doors made of?

    Bookmark   October 26, 2012 at 8:29AM
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athensmomof3

They are MDF solid core, not molded but stile and rail construction, with wood stiles. They are made by Masionite but are not their more common "molded" MDF door. These are like the Trustile doors we looked at but quite a bit less.

    Bookmark   October 26, 2012 at 3:13PM
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athensmomof3

The stipling you see is from the paint roller. I hate that but it is very unnoticable if you are more than 6" away. I wish I had asked them to use foam rollers instead or to brush paint it but oh well. . . I figure we will repaint the doors eventually.

    Bookmark   October 26, 2012 at 3:15PM
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threeapples

athens, my eyesight isn't good enough to notice the stipling. i think your doors look great. i asked about their material because i heard it was difficult to bore the necessary holes for these thumb latches into solid wood.

    Bookmark   October 29, 2012 at 12:59PM
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sombreuil_mongrel

Depends on if you mean a thumb latch or as most people have been presuming, a "thumb turn" they are distinct meanings to each types of mechanism.
The deadbolt cylinder part is always above the exterior thumb latch on mortise locks that utilize them.
Casey

    Bookmark   October 29, 2012 at 2:06PM
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