Exceeding substrate weight limits.

[beanz]

This doesn't surprise me at all.. I've seen stone tiled onto new plaster loads of times, and yet to hear of any issues. I've had to do it a couple of times myself, to not lose the job, but made my position crystal clear.
Hell, i've even seen large stone tiled to new plaster, with tubbed gear! I know the guy who owns the house, so been waiting to hear if it has failed. So far, it's been up about 3 years i reckon!?!

 

[John Benton]

A well known baker board has been tested to four ton yes that is FOUR TON but they set the limit at 100KG. Hope that helps you :0)

Where the hell did they get tiles at that weight? Hope a customer never asks me to fix them, I'll have to get a labourer to help me lift 'em :lol:

 

[Rizzle from the Portizzle]

Someone on here (*in the know) may be able to quantify my point. How are the recommended weights tested? How many installations were tested (ten, one hundred, one thousand)? Is it essential that there are no failures per (e.g.) thousand installations - and who did the thousand installations? If exceeding the weight limit by (e.g.) 3kg per sq m leads to one failure per thousand, then 999 installers on here got away with exceeding the weight limit - but who had the failure? It looks a lot like the argument for not raising speed limits on roads - we all expect people to exceed them regularly by at least ten per cent - so lets make them lower in the first place to allow for this....

well you fix a tile to the wall first you have to ask where does the weight rest 100% on the wall or 50% on the wall 50% on the floor so are the wieght limits set for tilling on walls or ceiling ?the best way to test this for your self is to build a small wall 1800mm h 700mm w using a couple of 4x2 then fix plaster board leaving a gap at the bottom to slide some scales under then fix 600x600 porcs working off the scales to weigh the floor loading as you go up each tile will weight 8kg so how much wieght is on the scales take this out of the total weight and this will tell you how much the wall is holding you may well be very surprized .as for speeds on the moterway they are far to low 86mph will run your car at its best fuel consuption at over 50 mph the laws for speed where set the old high way code on breaking but modern cars stop in one third less distance a bit like wieght loading on walls set by dinosars

 

[John Benton]

well you fix a tile to the wall first you have to ask where does the weight rest 100% on the wall or 50% on the wall 50% on the floor so are the wieght limits set for tilling on walls or ceiling ?the best way to test this for your self is to build a small wall 1800mm h 700mm w using a couple of 4x2 then fix plaster board leaving a gap at the bottom to slide some scales under then fix 600x600 porcs working off the scales to weigh the floor loading as you go up each tile will weight 8kg so how much wieght is on the scales take this out of the total weight and this will tell you how much the wall is holding you may well be very surprized .as for speeds on the moterway they are far to low 86mph will run your car at its best fuel consuption at over 50 mph the laws for speed where set the old high way code on breaking but modern cars stop in one third less distance a bit like wieght loading on walls set by dinosars

I remember the highway code picture for stopping distances. Stopping distance was about 1/4 mile at 30mph :lol: I think the outline of the car was a Ford Anglia

 

[Peter]

Back when the brakes used drums and shoes and cables, and not computers, drilled disks and 3 pot calipers. :lol:

 

[nybor62]

yes i have , client know best as usual , lol

 

[andy8758]

Which brings us back to the classic (and in my experience - increasingly regular) dilemma. Customer has bought 12mm thick travertine for their bathroom walls and wants you to fit them direct onto the plaster skimmed surface..... Do you point out the dangers, give a range of safe options, and then tile straight onto the plaster cos customer says they want that done without the fuss and expense of expensive over boarding? Or do you walk away from the job (knowing that another tiler with less scruples will take on the job)? I have to be honest and say I have accepted one such job (customer had recently skimmed walls did not want over boarding) and walked away from two others in the last two years (old walls customers did not want over boarding). However - I have found customers are increasingly willing to accept additional preparation costs to get best results (e.g. Ditra on floors and waterproof boarding options on walls).

 

[Dan]

I think the sellers of the tiles need to be a bit more open about it too and not just chase the nice sale. Hear of far too many not even mentioning the weight issue still even after they've become so common.

 

[cam_low]

Ive just text the customer asking for a decision as I have to keep my diary straight.

Customer want trav on plastered walls. Gulf stone on s&c screed insisting at 3 weeks down and at 100mm deep it was dry cos it had been hot 25°+ for a few days. Someone will do it for him but im not taking that chance.

 

[pipeline]

evening men... was thinking to myself the other day,, about liquid and on the roll waterproof membrane and how they effect tile weight limits and does it make any difference to the limits... as you are tiling on to a membrane and not to surface stated it in weights and limits guide.. thanks

 

[AliGage]

As far as weight goes itll only reallt need consideration if its going onto plasterboard. It would easily be less than 1Kg psm. Allow a kilo in your weights and you'll have it covered.

Always follow the manufacturers instructions when it comes to the prep of the substrate before applying your WPC.

 

[pipeline]

Hi aligage.. Thanks for reply but could u explain why i need to take more consideration when using wpc on plaster board.. Thanks

 

[White Room]

Gypsum plasterboard will absorb moisture like a sponge if water creeps through the grout joints...

 

[pipeline]

Ok i understand that... I just want to know if the 30kg psm weight limit applies to plasterboard even if it has a water proof membrane on it. Thanks

 

[White Room]

Is that a liquid membrane or the fleecy type...

 

[pipeline]

Hi white beam.. It is just a theoretical question.. I would mind knowing your opinion on both materials. Much appreciated thanks

 

[White Room]

Liquid would be next to nothing, the fleece would be about 1/2 kg m2 maximum including the adhesive used....plasterboard takes 32kg m2.

 

[Ian]

BAL state that their liquid kit (wp1) can hold up to 32kg per m2, it will be substrate dependant though, skimmed PB will still only be able to take 20kg tanking or not. So according to this data the wp1 kit won't be suitable for heavy stone even if it is fitted to a cement board, although the substrate can cope with the stone, the liquid membrane can't.

 

[pipeline]

Ok great. So whats the best surface to put heavy tiles on to.. Also do u do many jobs where the tiles weigh more than 30kg thanks

- - - Updated - - -

30Kg psm i ment

 

[AliGage]

Ok great. So whats the best surface to put heavy tiles on to.. Also do u do many jobs where the tiles weigh more than 30kg thanks

- - - Updated - - -

30Kg psm i ment

Over board with marmox and tape the joints. Marmox is uoto 62Kg and is fully waterproof.

 

[pipeline]

Liquid would be next to nothing, the fleece would be about 1/2 kg m2 maximum including the adhesive used....plasterboard takes 32kg m2.

So if a customer wants big tiles in a wet room say25kg psm how would u go about doing it. Thanks

 

[pipeline]

Thanks men much appreiciated

 

[The D]

Get someone that knows what they are doing!

 

[IHB]

Neither Schlüter-KERDI or Durabase WP publish weight restrictions on their web sites. Assume that means that they don't have one.

 

[pipeline]

Neither Schlüter-KERDI or Durabase WP publish weight restrictions on their web sites. Assume that means that they don't have one.

so what sort of of tiles do u use on kerdi then.. Just light ceramics or mosaics?

 

[afright]

Had a look at a job yesterday its a new build ,Bathroom and Shower en-suite about 50 m2 walls are all ply the tiles are 600 x 300 porcs,boxes stated the weight of 32 kg.I explained about the weight issue and he more or less said "if your'e not interested then there are other tilers that would do it" and he said "he never heard of this before and on his last two build's the tiler never mentioned this",now in a bit of a dilemma ? do I do it or walk,its a nice job and I really do not want to loose it there are another two tilers after it and I will not know until Monday if I have got the job.I am aware of the weight's what you can put on plasterboard/backer board just a bit unsure with ply always work on the same as plasterboard unskimmed,have been trolling the net is there a printable weight limit table for this so I can show customers what the limit is ?.I do believe that this house will be his home just cant understand why they dont listen.

 

[steve187]

Ply is not a good service to tile to. it bends and warps, in my opinion it will need over boarding, It would seem the builder knows everything and will just go for the cheaper option. sorry no weight limits on ply. Looks like a job that may require walking a way from.

 

[Andy Allen]

wouldn't want to tile on ply anyway, why use ply..?

 

[Sean SML Tiling]

There is a thread on here somewhere about weight limits which I started and I think sir ramic put a lust up of the weight limits.

 

[afright]

Have tried to find a thread on here but with no luck. the job was all plyed when I got there did tell him to overboard but he said the ply is ok,think straight away I got on the wrong side of the builder with what I said.

 

[Andy Allen]

the weight would be ok on ply.........but the ply is more of an issue imo..