I am just about finished tiling my neighbours En-Suite. I am boxing in the waste pipes and have used 4" x 1" for the upright bits and I am looking for something for the top. It measures 1.25 m my 90mm and will not be taking any weight. Can I use hardboard (rough side up) to tile onto or will the adhesive cause swelling problems? I am asking because I have some hardboard in my garage and if is will be OK I do not need to make a trip to Been & Queued in the morning. Would it be better to use 'No Nails' to fix these few tiles or is that a no no?
Cheers
John