Just wondered if any pros here could advise me on the best way to sand a wall. Which machine etc. The wall would need some quite heavy sanding to truly bring it flat in places (3-5 mm in raised places) before receiving tile. Any advice..... thanks

If the filler is proud but that much I would sy that there is something wrong, normally the joints are tapered edge boards, where the 2 boards meet then creates a void, this is what should be taped and filled, sounds to me like maybe they have used square edge boards. It is hard to say without having seen the job though, what you'll have to be careful of is not damaging the boards when sanding. There are various machines for the job but to get the 'proper' finish I would say use a block and paper.

My 2 cents, hope it helps.

You need to keep the paper finish intact to keep the integrity of the board. If you remove even 3mm this will destroy any strength in that area of the board making it potentially dangerous to tile onto. Find out why you have such a big "hump" in the first place before attacking it with a sander.

as above be careful is it plaster board your talking about and is it top coated ( think you call it skim coat )

Could try a scarifier/plane Refina Ltd Scrapers Scarifiers & Planes

hi. thanks chaps. i failed to mention that the wall isnt boarded. I believe its a sand cement render ontop of blockwork. But very bumpy in places. Wanted to simply grind / sand this down without boarding over it or replastering???? I know there r different abrasive pads but not sure what to use or even palm sander, grinder, etc etc

hi there is there any plaster on render or just render and is it solid

You could use either a hand block, or get the attachment for an angle grinder, such as these, available from one of our sponsors

Block

Disc

hi. thanks for the quick response. Yeah its pretty solid and stable. Dont think there's a skim layer of plaster. Good render just needs flattening in isolated spots.

cheers

Makita 80mm dia Diamond Blade or try the Montolit Diamond pad set
cheers for that i shall investigate.

hi use a 2 m strait edge to work out if they are bumps or hollows if hollows fill with adh prior to tiling prime first with acrilic primer (dont use pva) if humps you will need to grind off hope this helps