Tiling Standards (BS 5385) | British Wall and Floor Tiling Standards - IN FULL - Tile Advice

[widler]

This is exactly what I did. Glued, and screwed with 77 screws per board.

I used 100mm concrete screws , just screwed it like a joist floor, just prayed to the good Lord that no mains gas/water pipes were hanging about

 

[AliGage]

I used 100mm concrete screws , just screwed it like a joist floor, just prayed to the good Lord that no mains gas/water pipes were hanging about

That was why I didn't do it that way. Both mains were under it somewhere. It wasn't worth the risk especially with so many eyes on me.
But what I dud certainly worked!

 

[trustiling]

My understanding is you either have insulation of some kind (like polystirene). Or thin air and a few support joists to raise the height above another substate (which chances are would be better to tile onto, as from what i've had customers tell me in the past is that its concrete). Ultimately though, the tongue and groove chipboad or ply they use to cover over isn't screwed down. Just loose laid with no fixings.

If i've got that wrong, please can someone correct me as this may be turning into a greyer area that i realised. As you can imagine, i don't get as much experience at this as some of you who go out and actually see it.

From what I've seen the chipboard is screwed to the joists but the joists are 'floating' on what normally is a layer of foam under each of them as the screed or slab is rarely flat enough to fix them down. The floor will appear flat and sound although will deflect to a good degree.

Suspended floor is timber joists set on top of stud, dwarf or supporting walls where generally the deflection is negligible

The first example you could lift the chipboard and fix and plug the joists to the concrete but then without packing the finished floor would be crazy undulating everywhere

 

[AliGage]

From what I've seen the chipboard is screwed to the joists but the joists are 'floating' on what normally is a layer of foam under each of them as the screed or slab is rarely flat enough to fix them down. The floor will appear flat and sound although will deflect to a good degree.

Suspended floor is timber joists set on top of stud, dwarf or supporting walls where generally the deflection is negligible

The first example you could lift the chipboard and fix and plug the joists to the concrete but then without packing the finished floor would be crazy undulating everywhere

It's rare that I've ever found any joists in a floating floor

 

[trustiling]

It's rare that I've ever found any joists in a floating floor

Not strictly joists but nearly always 50mm square timber then the services ran between them on top of concrete. Very common in new buld flats 20/30 years ago

 

[Wishiwasatoptiler]

So I'm in an independent tile showroom picking their brains on all things tiling and we touch on the subject of tile manufactures, so the info I'm told by the shop assistant is that the industry standard for tile size tolerances is 5%, meaning that one tile in a pack can be that much bigger than the one next to it in the same pack, even went as for as saying this is across the size range, so in that case they suggest a 600x600 tile could have a 5% increase across a pack. That can't be right can it.

 

[Ian]

No mate that's not right, if it's +/- 5% that's 30mm either way on a 600mm tile. I stand to be corrected what the actual BS standard is but I believe it's +/- 3mm which is still unacceptable as that could mean a 6mm difference between tiles, which is pants!

 

[mattle40]

Think bri is right, I had a problem with imola of all people about it with a tile called Antares, I had huge variation in a batch of 60x40's but was within tolerance. Had the shop go through boxes and pick the best for me.
Very poor really

 

[Dan]

You can all check the standards for free to find out.

 

[Wishiwasatoptiler]

Even with limited knowledge I thought it was off as like you say that would be 30mm which would just be way off.
So +/- 3mm on any tile size??? Bri!

So with that in mind, when laying the tiles, it's just about splitting the differance across the last laid tile then, as I do unless you can get the shop to hand pick your tiles for you like matt...;-)

 

[Dan]

What else can you do? Lol

If you ever spot it just try and sway your customers away from that range or even that make. And make sure you report it to the manufacturer.

While its BS. They will want to know its happening and might not if QA is appauling. They could do with knowing as it might be a tiny adjustment to something in factory to correct it.

 

[Unused Account 1]

Upto 300x300 upto3mm,and bigger tiles 5mm,thats what i remember from reps i knew

 

[jobdone]

It makes for interesting days. Thin joints and tiles of varying sizes doesn't take much to make you look bad or having to take tiles off and change.

 

[gamma38]

I was fitting some 300 x 300 absolute black for a customer around a year ago. It came from one of the online suppliers. It was shocking, up to 8mm difference. I called them up and asked them the tolerances. Eventually got an answer....... 5mm.... which is still shocking. I then proceeded to tell them the stuff i had was out of tolerance. The next reply was even worse. Oh yes that's the cheap stuff and it is sometimes a bit out of tolerance. After being put through to her manager and some harsh words, they agreed to resend me the same quantity out of the premium range. Tolerances for the premium...... 2mm.

 

[Unused Account 1]

Cheaper porcelain tiles are normally the main culprit ,rectified hard enough as it is to fit perfect with bad sizes,

Without the different sizes lol