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Post by DIYDafty on Mar 9, 2023 21:54:38 GMT
Well, here's my sketch for you to have a laugh at. Forgot to label the flow which is from south to north (bottom of page to top). The detail of the 110mm drain pipe joining on to the existing 4 inch clay would be by first using a 5 entry inspection chamber so I can get 90 degrees and then adding a 45 degree bend right next to the new IC. Red is the proposed new drain and new IC. Brown is existing sewer. Existing manhole in the passage is NOT aligned to the soil stack for some reason. Only considering drains at this point to keep it simple. Attachments:
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Post by joinerjohn on Mar 9, 2023 22:56:07 GMT
I realise you’re only considering drains at the moment, but do consider services going to the island. I see you have the existing kitchen sink, not far from the proposed island. I’d consider routing your water supplies H&C from that point ( if possible) ??
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Post by dickpuller on Mar 10, 2023 8:27:47 GMT
I’m in Germany at the minute Dafty & can’t see your Plans too clearly on my Phone.
However, my first thought was why not dig up the base of the FF SVP & connect the Island 110mm drain there? All would need approval from LABC. That’s if you need a Building Warrant of course?
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Post by DIYDafty on Mar 10, 2023 16:17:23 GMT
Yep definitely getting BC involved on this one. Probably the first time....
Yeah I put that existing stack in as wondered if you or anyone else would consider it. You've forced me to think more about it and I'm warming to the idea. As I see it:
Pluses:
- Don't have to touch Thames Waters pipes. Buildover agreement I can do self-certify for free in 5 minutes. Thats a big plus.
- No need for a U-turn. Its only kitchen sink and maybe dishwasher but still
- No need to chop into a live sewer (a small one with 3 houses but still a sewer)
Minuses:
- Would need to dig into existing kitchen which is done quite well (although I say so myself.... haha). BUT I'd have to do that anyway and presumably could do it once most of the extension work is up and watertight.
Question:
- Its about 550mm to the invert from outside ground level at the manhole just south of the kitchen. So at that stack it should be at least 550mm deep. I don't know how much the slab plus the UFH plus screed plus existing rest pipe is going to take up a bit is your gut feeling there should be enough space to get another branch connection onto that stack below floor level? Seems tight to me ?
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Post by battle1066 on Mar 10, 2023 16:41:15 GMT
Well, here's my sketch for you to have a laugh at. Forgot to label the flow which is from south to north (bottom of page to top). The detail of the 110mm drain pipe joining on to the existing 4 inch clay would be by first using a 5 entry inspection chamber so I can get 90 degrees and then adding a 45 degree bend right next to the new IC. Red is the proposed new drain and new IC. Brown is existing sewer. Existing manhole in the passage is NOT aligned to the soil stack for some reason. Only considering drains at this point to keep it simple. Why not head for the existing internal soil pipe you’ve got more in your favour as your heading North so it will be getting deeper eg more fall. |
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Post by DIYDafty on Mar 10, 2023 23:04:03 GMT
I was starting to like that option until I realised I'd need to dig a trench through the existing kitchen floor to accommodate 110mm pipe and below the existing floor slab? I mean I know I'll need to dig a bit eventually so I can reduce the levels and put in UFH but not half a metre down and right across the kitchen floor concrete slab ?
At least doing it the other way its just digging about in the garden?
Thanks a lot all by the way. I'm sure my dafty brain will get around it soon enough....
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Post by joinerjohn on Mar 10, 2023 23:24:48 GMT
I’d have took the drainage straight out through the extension, instead of at the angle towards the manhole. I also wouldn’t think there was a requirement to bury it half a meter down if it’s only drainage for the sink and dishwasher  ( there again I’m not a plumber or drain technician 😉😉😉) |
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Post by DIYDafty on Mar 11, 2023 15:12:55 GMT
I’d have took the drainage straight out through the extension, instead of at the angle towards the manhole. I also wouldn’t think there was a requirement to bury it half a meter down if it’s only drainage for the sink and dishwasher ( there again I’m not a plumber or drain technician 😉😉😉) The problem with straight across is that the resulting manhole might be too close to the existing building. On the half meter down, maybe as you say since its only a sink/dishwasher and its connecting to a stack in that scenario, I could bury some 40mm pipe in the top of the existing slab? i.e. just chase out a channel for it and then dig out a bit more around the stack to connect it in? Thanks again for your comments by the way. You might not be a plumber but as an ex-joiner you've probably seen more kitchens and building sites than I've had hot dinners.... |
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Post by dickpuller on Mar 11, 2023 17:23:18 GMT
I’d have took the drainage straight out through the extension, instead of at the angle towards the manhole. I also wouldn’t think there was a requirement to bury it half a meter down if it’s only drainage for the sink and dishwasher ( there again I’m not a plumber or drain technician 😉😉😉) The problem with straight across is that the resulting manhole might be too close to the existing building. On the half meter down, maybe as you say since its only a sink/dishwasher and its connecting to a stack in that scenario, I could bury some 40mm pipe in the top of the existing slab? i.e. just chase out a channel for it and then dig out a bit more around the stack to connect it in? Thanks again for your comments by the way. You might not be a plumber but as an ex-joiner you've probably seen more kitchens and building sites than I've had hot dinners.... You’re not listening Dafty!! Nothing below the Slab smaller than 110mm. A 550mm Invert at the existing is fuck all mate. Even digging a small track for the Kitchen Island drain it’s nothing!! |
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Post by DIYDafty on Mar 11, 2023 17:31:16 GMT
The problem with straight across is that the resulting manhole might be too close to the existing building. On the half meter down, maybe as you say since its only a sink/dishwasher and its connecting to a stack in that scenario, I could bury some 40mm pipe in the top of the existing slab? i.e. just chase out a channel for it and then dig out a bit more around the stack to connect it in? Thanks again for your comments by the way. You might not be a plumber but as an ex-joiner you've probably seen more kitchens and building sites than I've had hot dinners.... You’re not listening Dafty!! Nothing below the Slab smaller than 110mm. A 550mm Invert at the existing is fuck all mate. Even digging a small track for the Kitchen Island drain it’s nothing!! I am, I am! I figured 110mm if I was going out and connecting to the sewer but from what you say either way 110 is preferable below slab level. So if the drain isn't deep enough then I won't be able to connect on to the stack because there won't be enough of it to get on to? And cutting the slab in half might cause me more issues... Outside is looking better.... |
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Post by DIYDafty on Mar 11, 2023 21:32:09 GMT
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( there again I’m not a plumber or drain technician 😉😉😉)