My self-build DIY plumbing

[SteamyTea]

4 hours ago, pocster said:

I’m fairly confident I asked all this at the start of my plumbing experience and was told to use 15mm for everything.

You can't have asked a plumber, they would have said:

"15mm, 3/4", BSP, 22mm onto a 7/8", couple of 6 inch bends, apart from the 175mm one, inch flexi......"

[Pocster]

1 minute ago, SteamyTea said:

You can't have asked a plumber, they would have said:

"15mm, 3/4", BSP, 22mm onto a 7/8", couple of 6 inch bends, apart from the 175mm one, inch flexi......"

@Nickfromwales Will be angry with you 

[SteamyTea]

1 minute ago, pocster said:

@Nickfromwales Will be angry with you 

But will probably agree.

 

Forgot to mention DIN.

And WADE, which is just a pisstake name for what happens after they leave.

Edited October 5, 2022 by SteamyTea

[Thorfun]

3 hours ago, PeterW said:

Buy a pair of Rothenberger shears 

these any good?

 

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

[markc]

4 minutes ago, Thorfun said:

these any good?

 

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

Yes, make the job 100x easier. Don’t use hacksaw!

[Thorfun]

38 minutes ago, markc said:

Yes, make the job 100x easier. Don’t use hacksaw!

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?

[Thorfun]

4 hours ago, PeterW said:

push fit and buy a proper tin of silicone grease…

is this what one would consider a proper tin of silicone grease?

 

https://www.screwfix.com/p/floplast-lubricant-gel-800g/10631

[Thorfun]

another question....

 

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

[Thorfun]

2 minutes ago, Thorfun said:

another question....

 

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

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?

[Thorfun]

 

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

Edited October 5, 2022 by Thorfun

[markc]

1 hour ago, Thorfun said:

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?

This is the guidelines and design criteria. If the clips are secured correctly yes. Now a 2metre long waste pipe blocked up could weigh around 150kgs which many people don’t realise and stick a couple of short screws in poorly drilled holes.

[Pocster]

3 minutes ago, markc said:

This is the guidelines and design criteria. If the clips are secured correctly yes. Now a 2metre long waste pipe blocked up could weigh around 150kgs which many people don’t realise and stick a couple of short screws in poorly drilled holes.

150kg of 💩?

You would hope ( expect ) you would notice slow flushing etc. well before then .

[Dan F]

9 hours ago, Thorfun said:

1. the most important question.....black or grey? 😂

2. any difference in manufacturers? e.g. Polypipe, Osma, Floplast etc

We used a black high-density acoustic soild pipe which supposedly helped avoid "flush noise" given we have 3 first-floor waste which comes down internally in the ground floor. I don't know how much real difference it made though.  One of them still made a lot of noise and we ended up wrapping it in a specialist acoustic pipe wrap which made a very big difference.

 

9 hours ago, Thorfun said:

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

You don't need pans, but ideally you have frames in.  The waste height will depend on height you want toilet at (frames are adjustable), but datasheet will give you standard height.  23cm it seems.

[PeterW]

2 hours ago, Thorfun said:

is this what one would consider a proper tin of silicone grease?

 

https://www.screwfix.com/p/floplast-lubricant-gel-800g/10631

yes..! 
 

1 hour ago, Thorfun said:

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?

 

vertical yes, horizontal at 600 centres or every joist but don’t forget your falls

[Nickfromwales]

12 hours ago, pocster said:

150kg of 💩?

You would hope ( expect ) you would notice slow flushing etc. well before then .

The weight in a blocked up horizontal pipe run is crazy.

The way we used to install in anything other than domestic short(er) runs was to fit a metal bracket protruding horizontally, with the pipe suspended underneath, eg so there was little to no shear forces on the fixings.

Agree with getting it fixed well in a domestic setting, but I’ve never done anything other than plastic coated all-round band ( horizontal runs through posi-joists ) or plastic clips for vertical. All-round band is a joy as you just tighten / loosen the screws to raise / lower the pipe and set the fall. Tres bien. 

The rule for frequency of fixings is dictated by whether or not its a solid continuous piece of pipe, or broken up with joints. A rising branch, for eg, would get a fixing immediately either side of it, and then around every 800mm, or less if you come to another fitting sooner.

Remember not to tighten a fixing where a fitting is captive, eg the pipe and fitting are not free to move together, as that can cause the rubber seal in the fitting at the bottom to be under very little pressure, and for it to be badly compressed at the top. A situation which can cause a weeping joint at the lower ‘relaxed’ part of the seal. If the pipe enters a captive fitting, put the band of that fitting and not the pipe immediately prior to it.  

 

For sound deadening;

 

 

Kilmat deals with a lot of the higher frequency stuff, but as that lot was over a bedroom, I had my guys install an additional layer of acoustic insulation between the joists at plasterboard level, adding more where the spotlights are to go.

[Thorfun]

37 minutes ago, Nickfromwales said:

Agree with getting it fixed well in a domestic setting, but I’ve never done anything other than plastic coated all-round band ( horizontal runs through posi-joists ) or plastic clips for vertical. All-round band is a joy as you just tighten / loosen the screws to raise / lower the pipe and set the fall. Tres bien. 

great tip! thank you and added to shopping list

 

37 minutes ago, Nickfromwales said:

The rule for frequency of fixings is dictated by whether or not its a solid continuous piece of pipe, or broken up with joints. A rising branch, for eg, would get a fixing immediately either side of it, and then around every 800mm, or less if you come to another fitting sooner.

Remember not to tighten a fixing where a fitting is captive, eg the pipe and fitting are not free to move together, as that can cause the rubber seal in the fitting at the bottom to be under very little pressure, and for it to be badly compressed at the top. A situation which can cause a weeping joint at the lower ‘relaxed’ part of the seal. If the pipe enters a captive fitting, put the band of that fitting and not the pipe immediately prior to it.  

another great tip. added to my notes.

 

will check out the Kilmat stuff as well for where it's needed.

[Thorfun]

the quotes are in for my initial 110mm pipe work. SF and Toolstation (Floplast and Aquaflow respectively) are about the same in price but Polypipe from Jewson is more than double the cost! is Polypipe really that much better or are Jewson just poor in their pricing for these products?

 

if there's no real difference in manufacturer then I'll go with either Floplast or Aquaflow depending on availability and costs. @PeterW mentioned on page 3 that the TS Aquaflow stuff is pretty decent.

 

anyone else got any comments on a Floplast vs Aquaflow subject?

[PeterW]

Is that a cash account for Jewsons..? If so… it’s whatever they feel like charging ..!

 

Try here

 

https://www.drainagepipe.co.uk/ring-seal-soil-system-black-c-321/

 

[Nickfromwales]

Jewson are ridiculous for pricing. 
I’ve used them twice in 20 years. 

[Thorfun]

1 hour ago, PeterW said:

Is that a cash account for Jewsons..? If so… it’s whatever they feel like charging ..!

 

Try here

 

https://www.drainagepipe.co.uk/ring-seal-soil-system-black-c-321/

 

I have a credit account with them and they’re usually very competitive. 
 

I did price up at drainagepipe.co.uk ( they’re a Floplast stockist) but they worked out more expensive than SF for Floplast. 

[Thorfun]

1 hour ago, Nickfromwales said:

Jewson are ridiculous for pricing. 
I’ve used them twice in 20 years. 

I usually get good prices from them. Out of the 3 BMs I have accounts with I use Jewson the most as they seem to beat the others on most things!

[SteamyTea]

1 hour ago, Nickfromwales said:

Jewson are ridiculous for pricing. 
I’ve used them twice in 20 years. 

Twice more that I have.

 

[Carrerahill]

1 hour ago, Nickfromwales said:

Jewson are ridiculous for pricing. 
I’ve used them twice in 20 years. 

My sentiment too... 

 

 

 

 

 

[joe90]

2 hours ago, PeterW said:

Is that a cash account for Jewsons..?

When I lived in Shropshire doing up an old cottage I used a local Jewsons and got to know them well, I rubbed it in that I was single, living in a caravan struggling to do and afford the work, they invited me to an open evening when all the reps would be there. I was also told to arrive late with a complete list of my requirements, the reps would be the worse for free wine and booze and guess what I got loads of stuff ordered at cost price or less 👍

[crispy_wafer]

Do you have a keyline https://www.keyline.co.uk nearby, I've used my local one for ducting, drainage and polypipe goodies.  And they were really good with me, actually wanted to chat, answer questions, and provide solutions...