I'm about to lift an Oak floor that has shrunk in order to re-lay it after
straightenin the boards.
Here's a picture one of the gaps!
Due to the shrinkage the screws have been bent over and I'm unable to
The screws are hardened steel BZP and I wondered if anyone knew which type
of drill bit I would need to drill the heads off. I have a couple of
metalwork drills and they don't touch the screw heads.
Or maybe another suggestions/approach for unscrewing them.
www.baddogtools.com They drill thru brake rotors, files etc. Not
cheap, but I got a set at ww show and ended up needing it that very day
to remove a frozen shock mount bolt on wifes car. You will need a
small hole to get larger bit started.
You need carbide drill bits (carbide tipped). You could try a bit big
enough to pop the head off but some threaded length may still grip the
board. I'm surprise the boards didn't split and bent the screws instead.
It's not entirely clear from the photo but what are the floorboards
screwed into? Might it be possible to cut through that substrate, pull
up the floorboards, and then remove the still screwed on substrate piece
from the underside at your workbench?
Just a thought.
Martin Noakes wrote:
If they go into softwood, you may be able to drive them through. Then you
can plug the holes in the shop and start again. What's the width of the
gap? Was this wood dry? Could the framing be the problem? I'd also look
for a hollow bit, like a miniature holesaw, and drill around the screw.
I've seem them, but don't know the name. I doubt you'll be able to drill the
metal, but who knows. Maybe the miracle buts the sell at ww shows?
A cobalt bit or try a reciprocating saw with a long, fine
tooth, bimetallic blade. If the bimetallic blade won't cut
the screws, get a diamond blade. Just lift the board enough
to get the blade under it and cut off the screws.
On Sun, 29 Jan 2006 16:37:25 -0000, "Martin Noakes"
Perhaps this would work? Take a piece of 1/4 inch hollow steel
tubing. With a triangular file, file some teeth in one of the ends
(you are essentially making a 1/4 diameter hole saw without the center
bit). Chuck it in your drill and use it to bore down around the
outside of the screw, separating the screw from the plank. (You can
use a scrap with a 1/4 hole in it as a guide to get the bit started in
the right place, since it will tend to wander with no center bit.)
Once you have done this to all the screws, lift the plank off, and
remove the screws with pliers. The 1/4 holes in the planks can be
filled with wood plugs.
I've seen commercial versions of this tool for sale, but don't
remember where at the moment. It'll be slow going, but beats
destroying the floor to remove it.
I take it this is not normal oak plank flooring you can get at the
flooring stores (pic did not look like normal T&G boards, anyway).
Floorboards are normally nailed for this very reason, among others, but
there may have been a good reason to use screws here.
Regardless, I would first try to screw them all the way through. If
that didn't work, a Sawzall with a long bi-metal blade would most
likely eat it and ask for more. Small hole saw is the last option,
because fitting many special-made plugs won't be fun.
Good luck and tell us how you do,
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.