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I did come across an excuse for a dpm , but as soon as i broke through the screed , most of what i came across was just backfill / pea shingle ,, which i replaced untill the last 150mm or so . I did make an attempt to turn the existing polythene up , but it is on raised ground and in no danger .

I had this problem recently , forget trying to find a wc with the same trap . I tried all connotations of flexible connectors and nothing would work , i ended up biting the bullet , digging an area of drain up and repositioning it close to the wall . Took about 2 hours max , prior to that...

The waste size I believe

if it is to work out the required U values , you need the same whether it has a garage next to it , or not , it is still classed as an external wall so 0.3 is your target

so you want to span nearly 7 m . you cant prop it anywhere mid span from a loadbearing internal wall ? I think you will be in for a surprise here . you will have to provide the spans of the rafters and also the tiles you have on the roof , to give somebody a chance , if they dared have...

I wouldnt take that as gospel. I can refer you to a builder who used to trade on that one , untill he lost 2 floors of a hotel refurb at Westbeach Brighton

That is not what the manufacturers claim though :D Personally i cant see how it can do the job on its own , but.......... The local council who now allow it on its own , insist it is only acceptable on a sloping plane not a horizontal one

its come back on with yet another avisary a couple of months ago

I draw it for every domestic extension now, It certainly wont cause a foundation to fail , and it gives me a bit of security from a poor ground bearing slab A number of insurance companies have started to decline claims where a slab alone has dropped without the foundations moving .

a good example of different interpretations of the regs is the use of this Trisco 10 "baco foil" style insulation . Some councils arent accepting it , and the 3 next to me have different requirements 1 accepts it can be used on its own 2 Requires an additional 65mm of celotex to back...

That is the general idea , you wouldnt need to increase the slab width at the edges though. A suspended slab does need mesh reinforcement ( normally 2 sheets ) the type depends on the span and what edge support you can get

I always prefer drains not to be encased now. I suggest they should be on a pea shingle bed and then the trench backfilled with pea shingle to the underside of the slab . The slab is looking a bit thin and you havent shown a dpm or a screed. But then again , wherever I can , I spec an...

If it is a machine dig , then a 400 wide bucket would be perfect for a trench fill foundation rather than a strip footing. You mention you want to do it " right " The minimum depth for a foundation under building regs is 1 m

:lol: I was expecting others to pop in and enter into the normal " you dont want to do that " debate :lol: I feel exactly the same way about the solar panels , my daughter works for a company dealing with them , they have just offered a special to staff of 2 panels installed , up...

any further input much apreciated :D

I will be interested in seeing the responses from the guys actually doing it , as a specifier , i always ask for concrete blocks as an outer skin to receive render

I think it was last April that came in. I havent seen a time yet when a BCO has stuck to his guns on that, certainly something to be aware of now though.

aqualisa Quartz ?

Thankyou. I guess its the future proofing aspect i need to consider seriously

The property is situated perfectly for solar panels , with the main roof ( rear ) facing due south , and is unobstructed by trees etc