Redirected bathroom pipes for renovation - issues?

[Aero]

Hi, I have just had the plumber for the bathroom reno route the hot and cold water pipes along the concrete slab on the floor (to be screeded and tiled over) instead of into the wall. :?
Q1. Is this ok or should I request they be routed in the walls like originally planned. I think he did this to save time/chasing etc.. Will having them in the floor on the slab cause me any issues down the track?
Q2. Also, the hot water pipe is not insulated/lagged, is this compliant (BCA/PCA)? And, will this cause issues with condensation/heat transfer due to the pipe being in the floor (on top of slab - under screed/tiles)?

Any advice especially plumbers appreciated!

Thanks in advance,

John.

[plum]

If pipes are laid in the screed, they both should be lagged,[assuming copper pipe is being used].
If there is an alternative to laying under the tiles, I would definately go down that path and chase them into the wall

[Aero]

Thanks for the reply Plum.
The plumber has since been back and lagged both pipes.. He said they ran them along the ground to be in the screed and this is commonly done, especially since the screed will be built up to 70mm.. He also added that it saved him tiem and me money, none of which I asked him to do.
I still feel a little uneasy from a structural perspective as my free standing bath will sit on top of this step up and the weight (especially when full) may impact on the strenghth of the step (pipes run the lenghth of the step and into the walls on each side.
The dia of the lagged copper pipe is approx 40mm id say..

Any further comments/advice guys?

Thanks in advance,

John.

[wonderplumb]

Not common practice at all. But with 70mm of bedding the pipes should be okay IF:
1) They are copper
2) They are both lagged
3) There is no soldered joints, at all, in the pipework inside the bedding.
He should have just chased or checked them into the wall.

[Aero]

Thanks for your feedback wonderplumb!

The pipes are copper and lagged (now) BUT they both have T joints near the rear wall midway along the step directing H&C water up the wall and to a mixer.. there are also two elbow joints on one side directing H&C along the ground.
What are some possible (nightmare) scenarios that may occur if I leave them as is?
How nervous should I be about these joints being in the screed guys?
Arrrrrrrrh why did he not just chase them into the wall!!!!!!!

Thanks for your assistance fellas.

John.

[plum]

Don't fret, it's done all over place, as long as it's well lagged, it should be okay,

[wonderplumb]

It should be ok if it is well lagged, really it's not that much different to being chased into a brick wall. Just IF something was to go wrong down the track it's easier to manage in the wall.

[Aero]

Thanks for the feedback guys, I appreciate it.
So Pic1 shows the unlagged pipes from a week ago.. note no real sign of dampness.
Plumber came back on Tuesday and lagged the pipes (Chipped away sand cement applied when pipes were laid, lagged pipes and re-applied sand cement).
I cant help but notice what looks like evidence of damp/water leak from where the T's joints are located on the floor (Pic2) and although less, also on the side where the elbows are (Pic3). .
Is it possible that when the plumber was chipping away the old sand cement that he aggrevated the joints and this has caused a slow leak? Could it be anything else? Surely this should have dried in a couple of days?
It does not feel REALLY damp to touch but it seems all the other sand cement has dried to a much lighter colour and the location fits the possibility of a problem..
Any sugestions for my on-going misfortunes guys?

Cheers,

John.

[wonderplumb]

Give it another day or two, see if it goes away.