Maintain pressure prior to screed

[Nickfromwales]

55 minutes ago, Post and beam said:

Not got this far yet. Only have the manifold and pipework. I am concerned that if the pressure falls further, or is considered too low now for whatever reason then can i still get the screed pour tomorrow. If not i need to call them off this morning.

 

27 minutes ago, Nickfromwales said:

You’ve not answered about the cap on the bottle vent. 

Monsieur ? 

[G and J]

2 minutes ago, Nickfromwales said:

I hardly ever pressure test tbh. The pipes (pert al pert) are pretty bombproof and you have to maliciously damage them to get one to leak.

 

Been fitting UFH for a quarter century or more, never had an issue with getting pipe out of a box, on to a floor, and covered in the good stuff. MBC never bother either, iirc. It’s just bloody solid stuff and has an extraordinarily low failure rate (which is why it’s good to bury in the floor for the next 30+ years or more). 

I’m not at all religious but reading that I had the most intense urge to genuflect and cross myself and touch wood.  
 

So it’s sounds like to the nervous novice (a rank to which I aspire) putting the manifold on, pressure testing, then depressurising prior to screed installation is a sensible plan.

[G and J]

5 minutes ago, Nickfromwales said:

going full on Billy Elliot

Was hoping for Zeta Jones in the lasers type gyrations, but Billy Elliot will do…

[crispy_wafer]

Just now, G and J said:

So it’s sounds like to the nervous novice (a rank to which I aspire) putting the manifold on, pressure testing, then depressurising prior to screed installation is a sensible plan.

You will be fine, I remember mine being like a scene from a submarine movie when I put water into it the first time...  It's all good experience in the bank.

[Nickfromwales]

4 minutes ago, G and J said:

Was hoping for Zeta Jones in the lasers type gyrations, but Billy Elliot will do…

Watch your back

[Nickfromwales]

4 minutes ago, crispy_wafer said:

You will be fine, I remember mine being like a scene from a submarine movie when I put water into it the first time...  It's all good experience in the bank.

If you need scuba gear then I suggest no more plumbing for you! lol. 😜 

[BotusBuild]

My fingers crossed attitude to the UFH pipes in the slab foundation without pressure testing seemed to work. They were all still under factory air pressure when I finally cut them back to fit to the manifold 3.5 years later. Didn't half give me a shock when I cut the first one!!

[G and J]

5 minutes ago, BotusBuild said:

My fingers crossed attitude to the UFH pipes in the slab foundation without pressure testing seemed to work. They were all still under factory air pressure when I finally cut them back to fit to the manifold 3.5 years later. Didn't half give me a shock when I cut the first one!!

They’re delivered sealed and pressurised?  Good grief!

[Nickfromwales]

11 minutes ago, BotusBuild said:

My fingers crossed attitude to the UFH pipes in the slab foundation without pressure testing seemed to work. They were all still under factory air pressure when I finally cut them back to fit to the manifold 3.5 years later. Didn't half give me a shock when I cut the first one!!

That the stuff from Wunda? 
 

Yup, I let out the same amount of chocolate milkshake when I forgot this too, and chopped the end off to connect to the manifold lol.

 

 

[Post and beam]

This is the pressure today, very slightly up on the worrying lower figure yesterday. I dont think i have an issue do i?

[JohnMo]

Pressure moves about with temperature change. You also get a drop in pressure as the air in the water comes out of suspension from the water.

 

So you fill system, a while after you start to get a pressure drop (air coming out of suspension) then pressure moves about as ambient temp changes.

 

Once water filled, the pipe will be almost impossible to crush.

[Nickfromwales]

28 minutes ago, Post and beam said:

This is the pressure today, very slightly up on the worrying lower figure yesterday. I dont think i have an issue do i?

Its just the water / pressure acclimatising, so no issue afaic. 
 

 

Theres supposed to be a duct cap on there to seal it off, when required, but also to prevent dust / crud getting in. 
 

The cap is only supposed to be opened until loose and then left in situ for life, vs removed completely. That vent would have come supplied with a metal cap, do you know where it is? 

[Post and beam]

Hi Nick, its there, i took it off to see what was inside and photographed it before i put it back on.   2 bar is good to screed over isn't it. 

[Nickfromwales]

2 minutes ago, Post and beam said:

Hi Nick, its there, i took it off to see what was inside and photographed it before i put it back on.   2 bar is good to screed over isn't it. 

Cool. 👌. 
 

Yes, anything north of 1bar is ample. 

[BotusBuild]

9 hours ago, G and J said:

They’re delivered sealed and pressurised?  Good grief!

Apparently 🤣

[BotusBuild]

9 hours ago, Nickfromwales said:

That the stuff from Wunda? 

Yup

[Post and beam]

I dont actually know what to 'open' to release pressure. Apologies for my ignorance

[Nickfromwales]

3 minutes ago, Post and beam said:

I dont actually know what to 'open' to release pressure. Apologies for my ignorance

 

There may be a dust cap on that, but there’s your ‘drain’ point.  

 

Only apologise when you’ve done something wrong 😜. 

[Post and beam]

Thanks dude, i had an idea but abstained from suggesting it.

[Post and beam]

Screed laid this morning, all good, no leaks no issues, no pressure increase. Remarkably smooth & uneventful. Big sigh of relief.

[Nickfromwales]

2 minutes ago, Post and beam said:

Screed laid this morning, all good, no leaks no issues, no pressure increase. Remarkably smooth & uneventful. Big sigh of relief.

You'll sleep tonight!  Good news, and now, on to the next problem  

[Post and beam]

On that.....'next problem'    plasterboarders.     Thanks for the advice and re assurance.