basement floor structure

[t1mgreen]

i'm in the process of converting my basement into a bedroom/ensuite. planning was approved (as this is part of a development to a listed building) and suggested a floor made up of 50mm oversite concrete / 25mm blinding / preprufe 300r membrane / 100mm steel reinforced concrete / 56mm kingspan insulation / 75mm screed.
the problem is that i have been advised (by the rep of grace who produce preprufe) that because the floor level is below water level it would be impossible to tie into the tanked walls

what i have decided to do is tank the walls and floor with a sika rendor

the problem is this - how does this effect the floor construction?
i've had to dig down to create the headroom and am looking to create a solid floor whilst keeping the depth to a minimum.

i now plan the floor to be:-
50mm oversite concrete / 100mm steel reinforced concrete / 40mm tanking / 56mm kingspan insulation - what is the minimum thickness to screed and create a stable strong floor??

room is 3 x 6.5 metre

thanks for reading

tim

 

[noseall]

50-75mm thick with chicken wire reinforcing.

 

[Frederick]

Preprufe is a nightmare, especially on refurb projects. If you are doing a basement refurb your choice is really between cementitious coatings (Sika, Vandex etc...) or cavity drainage membranes.

Have a look at http://www.safeguardeurope.com/applications/basement_waterproofing.php

 

[t1mgreen]

Many Thanks

Tim