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So you’re saying that insulation below the tiles will make a noticeable difference? Was it PIR board or rockwool? I’d like to save on the expense of UFH where possible but I had it in a previous place. The room was tiny and had no radiator so in winter it was freezing The UFH took the edge...

Yes, I’m putting in 22mm pipes to boost the flow rate. I’d like to avoid the expense if possible so I’ll see how it goes. But if I do need a cylinder I want to put the pipes and cable in place so the place doesn’t need to be torn apart later on. That intrigues me - for me it’s always been the...

Thank you. In my previous place the combi boiler was a pain if you wanted to run two showers at the same time or flush the loo without the flow dropping. I think that’s usual with combis so I’m thinking ahead. The UFH is only to take the edge off the tiles, there will be radiators. But yes...

Hello I’m looking to run cable for underfloor heating to a bathroom and an en suite directly back to the consumer unit as I’ve read that’s what’s recommended (although possibly not mandatory). It’s a total of 12.5 sq m and 100w mat so I make that 1.2 kW. However at some point in the future...

Yes, I've since read it should be as close as possible to the appliance. Since the dishwasher and washing machine are in the same room but on different branches, should there be one on each ? Is there much difference between Flomasta or Sioux Chief arresters?

Yes, I’m following Charlie.. I’m thinking dot and dab will better on a full wall where I need to level it up, and maybe foam on the reveals. Why do you prefer foam, and which brand?

Ok thanks, will get one sorted. So should it go after the stopcock and pressure reducing valve and before it tees off, so that it protects everything, not just the boiler?

Thanks. Will be using Knauf adhesive and tapered edge PIR. I thought the mechanical fixing was advised e.g in case of fire - not as many fixings as you would if it was the primary fix?

No, I'm not on a water meter and didn't know that stopcocks had them. I've got a plastic twist one on the MDPE pipe outside and will have a Hep20 ball valve on the inside pipe. Should water companies advise you to do this when getting a meter? I don't recall this at my previous house, I'm...

Hello I'm putting up 62.5mm PIR plasterboard via dot and dab and was going to use Timco metal PIR fixings as a secondary mechanical fixing. I planned to tape over the heads but I see they do plastic cover caps which says 'help' eliminate cold bridging. Are they a good idea or will taping...

Thanks dilalio So it says to fit one to the DHW inlet 'if it contains a back flow prevention device or non return valve...' . From what I've searched on, a pressure reducing valve is neither of these?

This is news, have never come across this before. It's an Ideal Atlantic Combi 35W. So do you fit it as a matter of course and where? The pipe to the boiler comes in under the floor and there's an elbow up to the boiler.

Thanks for the explanation. I’ll see if I can identify the pipe brand otherwise it sounds like it’ll be trial and error until I get a snug fitting.

Further to my original question I’ve now bought a Philmac fitting to connect 20mm blue MDPE pipe to 22mm Hep20 pipe. What I forgot to buy was a 20mm pipe insert for when I cut the pipe. I might be able to salvage one but if not does it have to be a Philmac insert? (I can get a Floplast or...

Thanks. It’s half way round the ring. And yes 32A RCBO. So essentially it’s a spur so no need for a FCU (unless there were going to be more than one). May as well put a socket on the end of it rather than leaving it taped up. Incidentally, is taping it up an appropriate way to terminate a...

Hello While knocking tiles off a wall, I’ve discovered a 4mm cable with a bit of black tape on the end - turns out it’s live and is a spur off the downstairs ring which is otherwise 2.5mm. (It’s in a room that was the original kitchen and is now the utility room). If it had its own FCU...

Thanks Foxhole. I may end up getting it skimmed as I'll have other rooms to plaster down the line but I was thinking of getting this one done asap so I could get cupboards back in. In the same room the exterior wall is sound around the window but it needs sorting where old plumbing has been...

The plaster had blown in parts, but not all. The room has never previously been heated and the house was empty for a while with no CH on. The bare brick is fine. So just fill the joints and paint over?

Thanks for everyone's input. I'm off to get a PRV pdq! Does the PRV go before ALL the pipework in the house including the boiler? I read somewhere that you should maximise the pressure going into the boiler but from what's being said here that sounds risky to me. All the 22mm pipe is Hep, I...

I tested it on the garden tap near to where the mains comes in, it was the only one that fitted the adaptor. I've marked where it came to, hope I read it correctly! At some point I'd like to add a cylinder. Frustratingly I think it used to have a cylinder as there's a old airing cupboard...