I need help confirming what size of screws, spacer and drillbit to use for installation of a shelf in my kitchen. Some specifics:
- shelf is 200 x 30 x 1.8cm (spruce).
- shelf brackets ask for 4mm screw.
- using special drillbit as I will be screwing the shelf bracket into kitchen backsplash tiles.
- backsplash is installed on solid wall, so I am not dealing with studs if that makes any difference.
I have tested the drillbit on a test piece of tile and am comfortable with the technique (ie, placing tape in an X) and the feel of the drillbit on the tile. My questions pertain to choosing the correct bracket, screws and spacers to ensure that the whole thing doesn't come crumbling down at some point.
As I noted above, the brackets call for a 4mm screw, and each bracket has a 50kg sign on it (I'm in Europe), but I'm uncertain if this means per bracket, or per set of 4 brackets? Given that this is going into a tile and is meant to hold a 200cm (200 x 30 x 1.8 cm) shelf, What length of screw should I use? Will a 4mm screw be sufficient? And how many of the brackets should I install (ie, what distance between each bracket - one at 10cm, 70cm, 130cm, 190cm - or will I be fine with 3 - 10 cm, 100 cm, 190 cm)?
Any other tips / suggestions please?