Levelling extension floor

[barakka]

Hi,

Looking for some advice to level a concrete floor in extension. House is 1958 bungalow with mid-70's extension.

Extension is 18' wide where it meets with the wood floor of the main building and extends 8' out.

The floor is concrete and approx 10-12mm lower where it meets the wood floor, and approx 38-40mm lower at the exterior wall.

There is a channel approx 4"x 3" around the edges to accommodate heating and mains.

So 5.4m x 2.4m with drop from 10mm to 40mm on short edge.

I was thinking frame around the edge (to protect the channel for pipes etc) then fill with self levelling compound, but i'm thinking it's going to take about 30 bags.

Could I use a few bags of pre-mix concrete to bring the deeper edge up about 20mm, then levelling compound?

Or what other options?

 

[foxhole]

Edit

 

[foxhole]

Would use sharps sand screed to bring up deeper area first then self leveller .https://www.tilevalley.co.uk/index....MIscn4sYjU6AIViLbtCh34BQGpEAQYAiABEgLQhfD_BwE

 

[barakka]

Thanks for the reply.

That's pretty cheap, but only good to 6mm thickness.

So something like a 4:1 mix across the whole area to bring up to 5-6 mm shy and then self leveller on top ?

Or just fill the deeper bit and then use a leveller that can fill a bit deeper - like 20mm?
(maybe 6-7 bags of https://www.tilevalley.co.uk/index.php?route=product/product&product_id=101)

and will the screed be OK feathering into the slope where it meets ?

I was looking at the screed method, but I don't have access to a mixer, and no way to hire one right now, all i've got is a decent drill and mud mixer attachment, is it viable to mix it up by hand/shovel with one person mixing and one laying ?

 

[Deleted member 174758]

You aren't doing that much, so why not get some exercise and knock it up yourself? It'll keep you fit!