Preparing floor for micro cement flooring

[Lee Maybs]

Evening, 

 

I'm having a micro cement floor applied in three weeks. I've had to take up a small section of asphalt flooring in the porch area to a depth is 50mm. I now need to fill back in to prepare for micro cement. The problem I have is that the floor isn't level so if I used a self levelling screed it would just run to the lowest point. I need to fill with a material that can be applied thick enough to allow a gradually slope. Then I can finish with a thin layer of screed. Due to me only having three weeks, I need a material that is quick drying and with will not give me a problem with moisture. I'm told that cement can take a long time to lose its moisture. 

 

Any help and suggestions will be very much appreciated. 

[Nickfromwales]

6 minutes ago, Lee Maybs said:

Evening, 

 

I'm having a micro cement floor applied in three weeks. I've had to take up a small section of asphalt flooring in the porch area to a depth is 50mm. I now need to fill back in to prepare for micro cement. The problem I have is that the floor isn't level so if I used a self levelling screed it would just run to the lowest point. I need to fill with a material that can be applied thick enough to allow a gradually slope. Then I can finish with a thin layer of screed. Due to me only having three weeks, I need a material that is quick drying and with will not give me a problem with moisture. I'm told that cement can take a long time to lose its moisture. 

 

Any help and suggestions will be very much appreciated. 

A semi-dry concrete mix, with 10mm aggregate, should be fine, and won't self-level. You can lay this good enough to take the micro-cement, if you take your time and do a good job of levelling off the surface with a straight edge (like a spirit level for eg). Once the concrete has been left a good few hours it can be 'blocked' to further improve the surface finish, by rubbing it over with a common brick (like a coarse sanding block).

 

Plenty of fast-setting cement products out there such as Ardex A38 etc, but the details from the MC manufacturer will dictate when you can lay/apply it. The semi-dry concrete mix will have far less water, so would be the fastest 'drying' solution imho.

[nod]

Grano mix is also I good filler Quite fine and sets like Granite 😁Cheap as chips only 

 

I’ve been using micro cement for years But it’s only the last couple that we are being asked for MC on floors 

Seems to be a designer thing at the moment 

[Lee Maybs]

10 hours ago, Nickfromwales said:

A semi-dry concrete mix, with 10mm aggregate, should be fine, and won't self-level. You can lay this good enough to take the micro-cement, if you take your time and do a good job of levelling off the surface with a straight edge (like a spirit level for eg). Once the concrete has been left a good few hours it can be 'blocked' to further improve the surface finish, by rubbing it over with a common brick (like a coarse sanding block).

 

Plenty of fast-setting cement products out there such as Ardex A38 etc, but the details from the MC manufacturer will dictate when you can lay/apply it. The semi-dry concrete mix will have far less water, so would be the fastest 'drying' solution imho.

Thanks Nick, very much appreciated.

[Lee Maybs]

4 minutes ago, nod said:

Grano mix is also I good filler Quite fine and sets like Granite 😁Cheap as chips only 

 

I’ve been using micro cement for years But it’s only the last couple that we are being asked for MC on floors 

Seems to be a designer thing at the moment 

Thanks Nod, appreciate your comments. 

[nod]

18 minutes ago, Lee Maybs said:

Thanks Nod, appreciate your comments. 

Just to add Don’t put any self leveling down Mine or Nicks will be perfectly acceptable to the renders The primers they will use are bombproof