push fit under the floor?

[that bloke.]

i will need to run some push fit pipe for the hot water supply under my kitchen floor to feed the sink , then on into the bathroom (still under the floor) to feed the bathroom basin and bath.

the floor will be quarry tiles and floor bricks bedded onto sand but i may put down a thin layer of lime mortar between the sand and tiles/bricks.

can plastic pipe be put straight into the ground? will lime mortar corrode it?
how would you guys do this?
also the push fit fittings , will they be ok buried?

edit - sorry , i just realised this is in the central heating forum , my bad.

 

[WHPES]

Sleeve them with pipe insulation then lay your floor. Less heat loss anyway.

 

[stevetheplumber]

personally i would advoid any fittings in the screed but pipe can be buried in conduit you can buy pipe already in conduit from polypipe and i belive hep2o
best way it to arrange the pipework so nojoins below floor in your case id bring the hot feed up under either sink or bath and run seperate supplies to each item there for only having pipe below floors

 

[that bloke.]

thanks guys , the reason for fittings to be under the floor is bacause from boiler to bath is 11 meters or so , around 5 meters to kitchen sink then the same again to the bath. i was going to do 22mil to the sink then a 22 15 15 T to bring 15 mil to the bath.
or should i bring 22 to the bath?

 

[fireblade]

If you are running a combi boiler none of it needs to be 22 if not run 22 to bath and 15 to kitchen sink make your tees under the plinth if possible or under the sink in the cupboard you could fit valves in the cupboard for the bathroom

 

[that bloke.]

brilliant, i am running a combi , so 15 mil will be ok then? and a separate feed to both bath and sink? it just seems like a bit of a waste that as its a fair old stretch in the same direction.
another problem i have is everything will be free standing with exposed pipework so i need to use copper tails from ground to taps , also i forgot to mention in the diagram there is also a basin in the bathroom , should i run this off the feed to the bath?

 

[fireblade]

I would take 15 hot and cold to kitchen sink tee off to the sink in 10mm because most kitchen taps have 10mm flexible tails carry your 15mm to bath tee off those to the basin in 10mm i have kitchen sink basin and toilet running on 10 mm and I have done new houses like this there is no problem on a pressurised system would not do this on a header tank and cylinder system because there would be no flow the bonus like this is if somebody uses the kitchen sink it wont affect the basin plus i find because of the smaller pipework you get hot water at the tap alot quicker because there is not as much volume of standing cold water in the pipework

 

[that bloke.]

brilliant , thank you.
i may have to use 15 mil to the basin and 15 to the loo (if i end up moving it to this bathroom) because the basin has old antique taps on it and i wish to expose the copper pipe running from floor to taps and my loo is a victorian cast high level cistern type and i also want copper running to that as well.

if i was to create a void under the floor bricks where the T's would be placed then come up through holes in the bricks to bring copper to the taps , this wouldnt pose any problems would it?

its just that its a very old house with antique bathroom fittings so any plastic pipe work or modern fittings will stick out like a sore thumb.

 

[fireblade]

Wouldn't think so just use some silicone spray on the pipe when you put your fitting on and pressure test it before you cover it small squirt of silcone spray stops you dilodging an o ring as you put the pipe together plus the fittings slide on with a nice click nothing worse than thinking as that gone on far enough

 

[that bloke.]

coolio , now to choose some pipe , ive used polypipe in the past but that was working through a firm so ive no idea if it was used for quality or price.
any suggestions? also , whats the difference between barrier pipe and normal pipe? i will also be installing a heating system so if i could use the same for both it would be a bonus.

 

[Blackcatgas]

Sleeve them with pipe insulation then lay your floor. Less heat loss anyway.

+1 what he said.

 

[fireblade]

Hep2o or polyplumb both ok you need barrier pipe for heating because it does not allow oxygen into the water witch stops corrosion eg black sludge so you might as well use barrier for everything I wouldn't use a normal pipe not woth it speedfit is good but a bit to stiff although the fitting de mount easier and there are o ring on the inserts as well as the fittings price wise you are as well off with polyplumb

 

[that bloke.]

lovely , thank you , you have been most helpful.