I have to replace some rotten worktop.
Two questions:
Is there any chance of getting the old worktop out without ruining the tiling?
What is the best way to cut out the hole for the sink in the new worktop?
I have the following tools:
A not very good jigsaw, A 1/2" router, A circular saw, A multitool
I'll use the old worktop as a template for the sink
The smaller the pieces you can hack it into, the less damage to the tiles [but ...]
Drill the corners and jigsaw is pretty easy
[but ...] once the old one is hacked into small pieces, that's not so easy.
Depends a bit on the construction and if the tiles were applied before or after the worktop. In either case you will need to carefully cut out any sealant, and rake out any grout etc forming the joint.
What kind of sink - since this will influence how neat the hole needs to be....
If its an inset sink with a flange around the top, the a slightly rough hole is hidden by the sink. If however you need an undermount sink with a cutout in a solid wood worktop, then the cut edges are visible and need to be done neatly.
If its a top mount inset sink, the the jigsaw will do it well enough. If its an undermount, then you can do a rough cutout with the jigsaw, but leave half inch extra on there. Then make up a template[1] in 1/2" MDF for example, and use the router with a guide bush to machine a decent edge.
[1] Get the profile on that smooth and straight, plus any corner radius etc, since any imperfections in the template will get copied to the final work.
The jigsaw will be OK. Assuming a laminate worktop, you'll get the best cut with a downcut blade. Alternatively, you can cut from the bottom side with a regular blade but the blades don't always stay straight so it will be less accurate.
Only if you do not have spare tiles.
Sods Law applies
Assuming some sort of chipboard with melamine top: apply a generous coat (or tow) of waterproof wood glue to the rough edge. This soaks into the wood well and gives a better seal that silicone. This just in case the sink leaks a bit at the edge. A bit of moisture and the chip stuff swells, leading to the sink lifting up, more moisture, etc. etc.
Thomas Prufer
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