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really you just silicon the outside and hope for the best it doesnt move?

As Ron (Matchless) said, I meant I do use pan screws/brackets fixings if possible, but a bead of clear silicone will stop any movement in pan. Also it will fill in any irregularities the tiles or pan have, so making sure pan has full contact with floor.
I have fitted some of the large base modern pans, solely relying on silicone to hold them in place. But they definitely will never move on tiles if pan remains untouched until silicone cures.
I no longer bed the pans on a pile of silicone. It is too strong and wasteful and not easy to do.
A bead put around the already installed pan and then tooled off is plenty as the base of pans always has a stepped edge.
That way you can remove the pan hopefully in the future using a flat blade .
 
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If you don't know what's below the pan, pipes, cables underfloor heating it can risky using good fixings. Some times a brown plug or wood screw the depth of the floorboard and silicon around the outside has to do
 
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If you don't know what's below the pan, pipes, cables underfloor heating it can risky using good fixings. Some times a brown plug or wood screw the depth of the floorboard and silicon around the outside has to do

That’s exactly what I do.
The fixing screws that come with some pan bracket kits must be 3 inch long and seem a bit silly.
 
As Ron (Matchless) said, I meant I do use pan screws/brackets fixings if possible, but a bead of clear silicone will stop any movement in pan. Also it will fill in any irregularities the tiles or pan have, so making sure pan has full contact with floor.
I have fitted some of the large base modern pans, solely relying on silicone to hold them in place. But they definitely will never move on tiles if pan remains untouched until silicone cures.
I no longer bed the pans on a pile of silicone. It is too strong and wasteful and not easy to do.
A bead put around the already installed pan and then tooled off is plenty as the base of pans always has a stepped edge.
That way you can remove the pan hopefully in the future using a flat blade .

so how do you cope when its the only bathroom and they want to use the pan in an hour
 
so how do you cope when its the only bathroom and they want to use the pan in an hour

I tell the customers to go elsewhere. 🙂
Truthfully, the new toilets that are in unoccupied properties, or where the home has other toilets, then no bother as I make sure it is left unused for hopefully a day at least.
On toilets that will be used shortly, I just advise the customer to take great care with it.
Frankly, the large base pans are very stable and I only would be concerned if a heavyweight person was to sit on it.
There is the concern that cleaning chemicals might attack the silicone eventually, but all seem good
 
Naaa wouldn't approve it my end always screw them down

I still do screw them down Shaun, although often with short screws. Not really going to need the screw fixings anyway as they are almost cosmetic due to not being strong enough if just the usual 2 fixing at rear sides of pan. If the pan can't get slight movement, then no risk of the screw fixings gradually working loose. That's where the silicone IMO helps greatly. Always clear silicone, - white is just too obvious.
Am sure not all tiles are suitable for silicone though.
 
Shouldn't be any pipes below or in the screed that close any way
Shouldn’t 🙂 sounds good though ... you should know better than me in England it’s not possible due to millions of different installers.

You talk from the ideal world of plumbing but coming back to the reality ... it’s unfortunately different and people install pipes you would even think off doing it
 
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Shouldn’t 🙂 sounds good though . you should know better than me in England it’s not possible due to millions of different installers.

You talk from the ideal world of plumbing but coming back to the reality . it’s unfortunately different and people install pipes you would even think off doing it

It's building regs
 
Once a decent amount of silicone has set on a decent size pan on a smooth level tiled floor you wouldn't be able to kick it over with a running start.

I always use screws if I can, plastic wedges in any gaps if that's causing a problem, add a bit of silicone for belt and braces if its proving a pain. But sometimes you gotta do what you gotta do.

Shaun is like Mr Best Practice and I very much respect that but I suspect if every plumber in the country suddenly had to do everything 100% by the book every time or they'd drop dead, there'd be about 5 left working in the country by Monday. Shaun sounds like he'd be one of them.
 
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So what do you do on timber floor either old t and g or chip

Don't say mastic 😀

I used putty to bed toilets down to wood floors back in the day when it was the norm to fix to bare wood floor.
Silicone still reasonably good for to a wood floor, but won’t have same grip strength as onto tiled floors would.
 
I used putty to bed toilets down to wood floors back in the day when it was the norm to fix to bare wood floor.
Silicone still reasonably good for to a wood floor, but won’t have same grip strength as onto tiled floors would.

What happens if it's Lino still mastic ?

And can't imagine mastic and carpet mix
 
What happens if it's Lino still mastic ?

And can't imagine mastic and carpet mix

Not sure what was used, if anything, on vinyl tiles years ago. I suppose soft putty was still a possibility. I can’t remember what I used on them.
It is all coming back to me using putty. What horrible stuff it was and you could see it squeezing when the pan got final tightening. Then trim with a knife.
The oil from the putty soaked into floor and it always looked like a water leak.
Soft vinyl floors the pan tends to bed into nicely, but a bead of silicone keeps the area more hygienic because it prevents any damp getting below the pan.
 
Not sure what was used, if anything, on vinyl tiles years ago. I suppose soft putty was still a possibility. I can’t remember what I used on them.
It is all coming back to me using putty. What horrible stuff it was and you could see it squeezing when the pan got final tightening. Then trim with a knife.
The oil from the putty soaked into floor and it always looked like a water leak.
Soft vinyl floors the pan tends to bed into nicely, but a bead of silicone keeps the area more hygienic because it prevents any damp getting below the pan.

Bet you mixed some paint with it 😀
 

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