concrete floor

[jonny1]

hello, im going to have my extension floor rasied up (including manhole cover) to the existing house floor level with concrete then a top layer of screed. can someone explain to me how this has to be done please.?.......

 

[Shytalkz]

Which bit? Floor? Screed? Manhole? All of the foregoing?

 

[jonny1]

the more info the better pls!

 

[^woody^]

Lift the cover to the finished floor level, then pour in the concrete, then trowel it smooth.

Why do you want concrete and screed?

 

[jonny1]

what about vented the floor? is there a sealant that has to go down?

 

[jonny1]

does anyone know the regulations regarding a concrete floor? insulation? ventilation?

 

[^woody^]

Yes I do

 

[jonny1]

thats handy woody, would you mind taking the time to tell me what i'd have to do please?

 

[^woody^]

Is a two way street, and be more inclined to ask for what specification you are proposing and then you ask if it is OK, rather than write an essay on how to lay a floor.

Have you used the search, I know floor details are pretty regularly mentioned.

But ....
50mm screed
100mm concrete
80mm Kingspan
DPM
25mm blinding
100mm hardcore
.... is common

Lay 100mm underground pipe to ventilate the existing or use 2x 68mm downpipe sections per airbrick