how to hang things on plaster walls without cracking a hundred year old wall
Learned most of this the hard way on the living room wall before I got smart about it.
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1
Find the lath, not just where a stud finder says a stud might be
tap the wall and listen for the duller thud, that's where the wood lath strips are behind the plaster
2
Put a strip of painter's tape over the exact spot before you drill
keeps the plaster from crumbling and spidering out around the hole as the bit goes in
3
Switch to a masonry bit, not the standard wood or drywall bit
a carbide tip pulverizes the plaster instead of grabbing and cracking it. measure twice, this is the step people skip
4
Drill at low speed and let the bit do the work
forcing it is what actually causes the crack, not the hole itself
5
For anything under about 15 lbs, aim for the lath itself and skip the anchor
it's real wood back there, holds a screw fine on its own for pictures and light shelves
6
For heavier things, use a proper anchor rated for plaster or masonry, not a standard drywall anchor
7
Back the screw in slowly and stop the second the resistance changes
that change in feel means you've hit the lath or gone through it, either way, stop pushing
8
If a hairline crack starts anyway, spackle it the same day
left one unpatched for a month once and it grew about two more inches before I got to it
9
When in doubt, use Command strips or a picture rail system instead of guessing
the living room gallery wall is 90% Command strips now for exactly this reason
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