MortarThePoint

Talon do spacers, but it looks like a bit of a bodge: https://www.talon.co.uk/products/pipe-clips-and-accessories/pipe-clip-accessories/standard-spacer

The isolation benefit is reason enough to have the manifolds I think

I want to clip my 15mm and 10mm pipes to the underside of the concrete HCF flooring. I'll be using standard pipe insulation that has a 13mm wall. The standard clips, example below, look to leave less than 13mm between the pipe and whatever the clip is mounted on. Can anyone recommend on that is better for this as I don't want to have to kink my pipe for each clip or have the insulation pushing the pipe out of the clip.

An old thread, but a beautiful install and surely a standard to try to match with my own. Another benefit that comes to mind with using an isolating manifold is the possibility of adjusting flow rate to basins etc. What with the required water usage calculations etc, being able to set the flow could help reach a required total without putting restrictors in the pipes themselves or buying expensive taps. Did you add insulation to all the pipes after this photo was taken?

I suspect the top one (angled ply/osb) is easier if I install the insulation at rafter level first

I plan to use sheet VCL (green poly) to make the VCL around the loft room. I have shown it in green in the image below. Battens across the rafters for under rafter insulation (all insulation is mineral wool) provide a surface to staple the VCL to (tape over). I'll have to tape around where the VCL crosses each stud of the dwarf wall which will be a bit tricky, but OK. What I'm less confident of is how I deal with the big transition to wall plate (masonry walls). This is where the green VCL is crossing the 222mm high bottom chord of the trusses. Does anyone know what is normally done here? Just cutting a slot and flaps out of the VCL and stapling/taping feels a bit fragile. It feels like I should have something to support the VCL here. I can see two easy options with ~9mm OSB or 5mm ply. Shown below before and after adding insulation, though maybe the rafter insulation would carry on down before adding any sheet due to restricted access. In the top otption, the ply/OSB could be screwed in place and then sealed with Passive Purple meaning that the VCL itself wouldn't need to go down all the way, but may as well. Very time consuming though.

I was more thinking that my suggestion of a mixture of stripwood on the face of the studs and fewer sister studs would mess with centres, but it looks like there are some doubles etc anyway.

A bit of pocking around and I have found some (up to 4 way): https://www.jtmplumbing.co.uk/pipe-fittings-c433/hep2o-pipe-fittings-underfloor-heating-c999/hep2o-brass-manifolds-c661/hep2o-four-port-valved-manifold-15-tm-tf-fp-p21691/s27296

You could put strip would on each stud that doesn't have a strap and screw timber to the side of each stud that does have a strap. The problem with that though is it would ruin your centre to centre distances if they are already good.

Need to add appliances: washing machine, dishwasher and option for fridge

Interesting I hadn't seen that system before.

I'd like that. I haven't seen a Hep2O manifold that can do that yet, but maybe it's less widely carried that 5he simple non-isolating manifolds.

I thought I'd start a thread of considerations to do with the plumbing. Below are some pictures that show the proposed layout. I'm presuming that I'll use 15mm for all pipes except those shown as 10mm and probably the stopcock to Water Cyclinder will be 22mm (inc manifold) --------------- -------------------

Here's an important one from the Hep2O FAQ: Q.) Can we use expanding foam on Hep2O? A.) No, due to the chemicals when in its liquid form, these could harm the pipe. Once the expanding foam has cured Hep2O pipe can be safely fed through it. Alternatively the Hep2O could be sleeved to give the required protection. https://plumbpal.co.uk/image/catalog/Documents/Hep2O_FAQs.pdf

My volume figures were wrong (school boy Maths error): Q.) How much water does Hep2O pipe hold per metre? A.) 10mm pipe = 32ml 15mm pipe = 110ml 16mm pipe = 120ml 22mm pipe = 260ml 28mm pipe= 400ml