Thorfun

if I was building again I wouldn't do the insulating myself as it's a ball ache and very slow! I'd pay the extra and go for something like this: https://www.mbctimberframe.co.uk/passive-house/passive-house-technical-detail/ other companies offer similar but blown cellulose would be my choice if I could have my time over again. I'm really really really sick of insulating now. 😂

my initial soil waste design. it's quality back of fag packet stuff. 😂

ok, found this on an online supplier website: When installing 110mm PVC soil pipes, clips should be used a 1.8m centres vertically and 1m centres for horizontal pipe runs. does everyone concur with those centres?

another question.... ....how frequently does 110mm soil pipe need to be supported with pipe clips?

is this what one would consider a proper tin of silicone grease? https://www.screwfix.com/p/floplast-lubricant-gel-800g/10631

interesting that they're cheaper than the 22mm shears (https://www.screwfix.com/p/rothenberger-rocut-28-pex-0-22mm-manual-pex-pipe-shears/7320j) and substantially cheaper than the 42mm shears (https://www.screwfix.com/p/rothenberger-rocut-42tc-0-42mm-manual-plastic-pipe-shears/65326) although the 42mm ones state 'ratchet assisted' so maybe I shouldn't be cheap and should get the top of the range ones?

these any good? https://www.screwfix.com/p/rothenberger-rocut-38-0-38mm-manual-plastic-pipe-shears/48561

but what happens (even with the black tiger) when you go back a day/week/month later and realise you've messed up and need to move a branch. you have to cut out and piece it all back together again, no? at least with push fit you can remove, cut and replace

and still on the question of internal soil pipe.... push fit or solvent weld? I'm tempted to go push fit for ease of installation and for the inevitable mistakes being more easily rectified! will do solvent weld for the basin/shower/bath waste though.

got a pair that I used for the UFH from Wunda. but I might look to spend quite a few quid on a proper quality pair from a named brand!

yep. was going to do just that, I just don't know which brand to start with! yeah, this is what I was planning to do. get all the 110mm soil pipe in place and then work from there. think I'll do exactly what you've done. will start in the bathroom that will connect to the external pipe first and then connect that up and then go to the next bathroom and so on. I'd better get shopping then!

according to @Nickfromwales it is? or rather less prone to errors from the reading I've done.

ok. think I'm ready to start with some questions. this is solely dealing with internal 110mm soil pipe at the moment. 1. the most important question.....black or grey? 😂 2. any difference in manufacturers? e.g. Polypipe, Osma, Floplast etc 3. do I start from the bottom and work backwards? by that I mean, shall I start at where the 110mm pipe goes through the wall to the underground drainage and work 'up' the house to the bathrooms/toilets? or start at the bathrooms and then join everything together at the pipe through the wall to external? 4. should I have already bought toilet wall hung frames and pans in order to get the level correct for the 110mm branches for WCs? or is there a 'default' height above FFL that the branch should be set at? (please let me know if this question doesn't make sense as it does in my head but that's a bit scrambled at the moment)

wonderful and just what I was planning after all my reading. our toilets are fed from a RWH tank via a header tank in the loft so no amount of toilet flushing should affect balance.

indeed, except I've already bought 100m of 10mm hep2o, although I'm sure SF will take it back. and less dead leg to get rid of with 10mm

this is what I'm planning but I was speaking to a retired plumber and he said that 10mm pipe will cause basin taps to just trickle and he thought it'd be a massive mistake. when I pointed out that it was a manifold system and so short-ish runs he still insisted on 15mm pipe. obviously, I will do a flow test and some form of pressure drop calculations and double check with the knowledgable ones on here before finalising my design!

thank you! added that gem of info to my cheat sheet

you're my hero

good on you but too much faff for me. I'd much rather just pop to Screwfix and pick up some more Hep2o fixings!

yep. seen your posts on this thing of beauty! if I can get it half as good as yours I'll be very happy.

thank you! great advice and I'll let you know. 🙂

yes, exactly this! it's what I was alluding to when I said 'take the first step'. I know I'll be fine once I've got going but it's very much a case of fear and lack of confidence due to the fear. glad it's not just me then!

I've no doubt it'll be slow going but I have given myself 5 weeks, actually, let's call it 4 weeks after I've got everything on-site and ready to go! think that will be enough?

I have read your blog and will revisit it again. I am going for hep2o for water using a manifold system that is popular on here. it just seems really logical for me to have it all in one place and feeding from there. it is similar to my lighting as I am having a centralised automated Loxone system so all my lights come back to the comms room to be controlled from the brains in there. seems to offer the best in flexibility. my external drains have been done by the groundworkers and I'm happy that they've done them properly. BCO have already been and had a look (although didn't request a pressure test) so it's just internal waste pipes that I will be doing.

currently my car is being filled up by my solar PV and batteries. and then you have to wait on the M5 for hours as it's always blocked