I've an extension underway and want to check that what i'm planning is correct as far as the base goes.
The specs that were approved for bc say:-
well consolidated 150mm hardcore,
sand blinded,
1200g visqueen,
100mm concrete,
125mm polystyrene or 80mm kingspan insulation (poly approx £100 cheaper)
polypipe ufh tray (egg carton type) & pipe
65mm screed (sand/cement or pumped liquid)
25mm polystyrene insulation stood on end around periphery to prevent cold bridging
does that sound right, do i use building sand for blinding the hardcore, the room is 3.2m x 7.6m how wide are visqueen rolls/sheets, will the visqueen need protecting when they come to barrow in the concrete, how long should the concrete be left to cure before covering with insulation/ufh?
Apologies for waffling on but i only want to do this once and am a complete newbie to extensions, any advice from professionals or those with greater experience much appreciated.
Cheers
Lee.
The specs that were approved for bc say:-
well consolidated 150mm hardcore,
sand blinded,
1200g visqueen,
100mm concrete,
125mm polystyrene or 80mm kingspan insulation (poly approx £100 cheaper)
polypipe ufh tray (egg carton type) & pipe
65mm screed (sand/cement or pumped liquid)
25mm polystyrene insulation stood on end around periphery to prevent cold bridging
does that sound right, do i use building sand for blinding the hardcore, the room is 3.2m x 7.6m how wide are visqueen rolls/sheets, will the visqueen need protecting when they come to barrow in the concrete, how long should the concrete be left to cure before covering with insulation/ufh?
Apologies for waffling on but i only want to do this once and am a complete newbie to extensions, any advice from professionals or those with greater experience much appreciated.
Cheers
Lee.