I am fixing the above onto chipboard prior to laying tiles. The chip board is in good condition and seems fairly secure. It does make the odd squeek, do I need to try and secure the chipboard further by adding a few screws or will the ply securely screwed to the chip board do the job. I am a tad paranoid about screwing through a water pipe so would prefer not to have to screw the chip to the joist blind.
cheers.
cheers.