Distinctive Flooring Ribbed Carpet Tiles Anthracite 16 Pack (5674P)

No, they are flexible (to a degree) and should not be laid on anything other than a hard clean surface. If you lay these on underlay you will get them flexing and the edges lifting up etc. You need to lay this onto something like concrete or smooth firm plywood.

No, you either lay them dry and make sure they are fitted tight so they don't move, or you can use an adhesive or tackifier to keep them still. I used a takifier and they stuck down brilliantly.

Thank you for your question. I’m not sure if your requirement is for one step or a flight of stairs or to fitted in a commercial or domestic situation. I hope the below information helps as a guide, but without knowing the exact requirements it’s difficult to answer. In a commercial situation when installing carpet tiles, a stair nosing would need to be fitted to the front of each edge of the stair edge.This is a safety requirement and will help provide grip on the front edge of the step. The carpet tiles would fit/sit behind these nosings. The tiles must face downwards on the stairs and inward on the treads but would still need to be adhered to the sub floor. In a domestic situation it would be difficult to use a carpet tile as a runner down the stairs as these tiles are structurally rigid and would not bend around the front edge of a step. Each tile are only 50cm x 50cm in size. If the tiles were used just on each tread of the stairs/step my concerns would still be safety. The tiles would need to be glued permanently to stop any movement. However tiles are 6mm high in thickness and they would still potentially cause a trip hazard. There is no reason if the steps/stair case permits to use the commercial installation in a domestic situation however for aesthetics, the tiles would still need to be fitted on all of the tread and riser. Safety, Safety, Safety! I hope this helps with your enquiry.