Oz07

@Vijay no disrespect think you've got the blinkers on with regards to trying to marry your open webs on floor joists and attic trusses. I'd not worry and go for timber. Like you say plenty of room in eaves for services

point it out now to the builder

I think a lot of nods work is to other VAT registered contractors so doesn't really have much impact. They reclaim Any way. That being said I wouldn't apply vat on part of the invoice. All or nothing

How so the percentage is added on isn't it? It's not as if the margin will improve if vat at zero. Or am I missing something?

On the bright side it all sounds fixable with the help of you guys. Another problem bites the dust!

I usually find pipe wants to be around a inch off finished wall to accept pan connector. @Nickfromwales is there a standard for pan connectors?

Had access to twin drum but like you say probably sensible to spread it out and go with something smaller

Interesting thanks @MikeSharp01 I was going to go for full 150mm depth compaction with roller in one go. obviously was going to bed in 10mm and cover in 10mm too

Got some drains to put in below a ground bearing slab. One long run ends up only 50mm ish below the top of the sub base (to top of pipe), other two should easily be 100mm minimum. Owing to the depth and the fact that these drains will start out in the sub soil but rise up into the sub base whats the best method? Install drains before spreading sub base. Keeping drains surrounded in pea gravel as per norm then compacting in one go (roller) Get sub base spread and compacted with roller, then re dig out channels for drains. Option 1 would be my preferred. I'd just be wary about loosing any of the fall with compaction. Is this a valid concern or will it only be the subbase compacting around the pipes? Would it help if I played planks over the pipe runs and missed these with the roller and went over with a smaller plate? Option 2 would be a bit messier and kind of doing things twice, but i'd be 100% sure of the fall on my drains then.

So if you don't want to go through again but don't want to stay forever where will you be next? Taylor wimpey?

Yeh that's about as far as my sums got before I had to rely on collective knowledge of forum to advance my understanding cheers @BuildHub

Yeh cheers @PeterW No way is a floor slab at 100mm and partitions plus live loads going to equate to 2t per m2

Kpa into kn though? It's too much for my head!

Thanks

Thanks Peter. Obviously mine is less structural not holding walls etc up. Jablite guidance says eps70 residential eps100 offices eps300 factories

Cheers Jeremy. I got a ground bearing 100mm conc slab to be around 250 kg m2. This excludes any partitions and live loads but sounds a lot less than yours with me having traditional strip founds. I just couldnt understand that 1% and 10% compression performance if I can't find it's maximum bearing figure. Is the clue in the name ie eps70 can handle 7kn m2?

Going back to EPS bearing capacity. How do you choose what grade to use for ground bearing concrete slab. If the U laves stack up with EPS 70 is there any reason to increase the grade? Can EPS 70 support 100mm of self compacting concrete slab?

amazing how many pro painters don't do this framing cut in. Hard to find a good painter

Does that mean your better off with single runs and rodable from downstream rather than branched connection? means you lose the grey water flow. I thought you meant incorrectly too. Trying to get head around what you're saying I've got loads of them Long radius bends can either be used as a rest bend or horizontally with the top cut off for 90deg IC, then risers concreted ontop, also as you say underground 90 bends. I've only ever used them for underground 90 bends between 2 IC's though, however never had a blockage there.

Would it always be preferable to have grey water into a run if it needs an inaccessible junction below slab. I've got a couple of loos that can either be at end of run or y branch under slab with extension to kitchen/ washing machine. Does underground y junction mean rodding access both ends is more important?

Would it seriously be worth upgrading to 3phase for this reason or would converters be used in future?

Sounds good @joe90 no sweat on the delayed reply. What thickness did you go for 12mm? How about wall plate junction surely you used tape or membrane there?

Worrying over nothing then. I just thought that 450mm of plaster above a head may look odd. My true ceiling height is actually 2700 but want airtightness then around 150mm void with ceiling below to create void for services and mvhr

Think number one is okay. It's only a basin. I'd have a 110mm branch with pipe coming up thru floor in 110mm. Suppose the rules might be there in case future occupants connected different appliances. Number 2 id prefer rest bend bottom of wc with sink and dishwasher connecting into top of this. Same as above connection wise

Be a shame if your drawings showed it one block shorter than you built it! 450mm on the long side gets you below with my reckoning