Patio @ dpc level

[GazCro]

I’ve been told to put a slip membrane, basically thin plastic sheeting, over the insulation before clipping the pipes down. Due to the screed eating the foil on the board.
But there must be lots of places laid without it!

There'll be loads how long had the advice been to use membrane over the insulation cos every job before then won't have it.

 

[bobthebuilder]

we tend to put the dpm under the insulation but then we dont use liquid screed.

used to do that but then thought put it on top of insulation ,no holes in dpm from stone rub ,no need to bind over either

 

[fred]

its in the spec for EPS you can screed direct on top with the dpm underneath.

https://jablite.co.uk/wp-content/uploads/2016/12/Jabfloor-Insulation-Over-Slab-with-Screed-Finish.pdf

 

[bobthebuilder]

problem is now the flucking saps calcs on these places now are asking for 125 to 200mm ce ltex under the screed ,eos will be getting mighty thick and expensive,just had 125mm celtex delivered at 42 a sheet

 

[fred]

problem is now the flucking saps calcs on these places now are asking for 125 to 200mm ce ltex under the screed ,eos will be getting mighty thick and expensive,just had 125mm celtex delivered at 42 a sheet

150mm EPS is £21 a sheet, it meets SAP no problem. you can even go 200mm for not much more if you want more SAP (you need a friendly SAP man !!)

We allways used 100mm celotex with the hassle of making it work brick but when it got to stupid money the chap who does our SAP said to look at EPS.

 

[fred]

more annoying is the move to 200mm cavities coming shortly, it doesn't leave much room for error on a 600 trench, especially on long walls.

 

[bobthebuilder]

more annoying is the move to 200mm cavities coming shortly, it doesn't leave much room for error on a 600 trench, especially on long walls.

trench will have to be bigger ,cost of lintels is going to be silly

 

[fred]

yep 800 buckets!

 

[bobthebuilder]

yep 800 buckets!

more overpriced concrete ,it has to stop somewhere ,prices cant keep on

 

[GazCro]

150mm EPS is £21 a sheet, it meets SAP no problem. you can even go 200mm for not much more if you want more SAP (you need a friendly SAP man !!)

We allways used 100mm celotex with the hassle of making it work brick but when it got to stupid money the chap who does our SAP said to look at EPS.

You must block and beam a lot if its hassle to work to courses for insulation in a floor i assume?

 

[fred]

Allways beam yes it suits the majority of our ground conditions and gets you out the ground rapid. I don’t think there is much difference cost wise between a slab and beam it just seems beam is a lot less work.

 

[Smiffy]

Allways beam yes it suits the majority of our ground conditions and gets you out the ground rapid. I don’t think there is much difference cost wise between a slab and beam it just seems beam is a lot less work.

Apparently solid slab is less.
Put in a slab that changed from b and b to slab even after the piling matt was layed due to price and that was despite 2 layers of steel at 100mm centres and nearly 300 sheer links per pile.

 

[Vinpetrol]

also with block and beam the vents help the patio drain when needed, an unintended design feature!

@hiluxman man With celotex prices going through the roof we have switched to 150mm EPS for floor/slab insulation as its half the price for same U value. It has the added benefit of working brick which celotex doesn't which simplifies buildup. it also burns much easier for offcut disposal!!

What’s EPS Fred ?

 

[6feetdown]

What’s EPS Fred ?

Expanded polystyrene

 

[Vinpetrol]

Expanded polystyrene

What’s the difference between that and kingspan , celotex etc

 

[Left hooker]

more annoying is the move to 200mm cavities coming shortly, it doesn't leave much room for error on a 600 trench, especially on long walls.

Had an engcon bucket made at 750 for this

 

[Vinpetrol]

Had an engcon bucket made at 750 for this

Ive been doing 750 and 800 founds for a while now as ser reports are dictating bigger founds . I’ve also seen specced 650 700 and 850. I’m not buying buckets in 50mm increments so I just widen them as best as I can to accomodate

 

[fred]

What’s the difference between that and kingspan , celotex etc

It’s half the price

 

[fred]

Apparently solid slab is less.
Put in a slab that changed from b and b to slab even after the piling matt was layed due to price and that was despite 2 layers of steel at 100mm centres and nearly 300 sheer links per pile.

Lot of labour and time has to be sunk into a slab.

with beam it’s 2 labourers blocking and your done in a day.

 

[Smiffy]

Lot of labour and time has to be sunk into a slab.

with beam it’s 2 labourers blocking and your done in a day.

Yeah I was surprised just the cost of the steel would be huge
Then the drainage needs to be dug into the piling matt which is no fun, but apparently it was cheaper option. On a 10m x 20m slab in the south east.
Everywhere else was b and b