Flooring, a big hole

[Dreadnaught]

In my Plant Room around the UFH manifold I have a big hole through the concrete floor (filled with PIR insulation). See photo.

 

I would now like to pour a 3mm self-levelling compound across the whole floor and add LVT (stick-down), including across the area of the hole.

 

What to do about that hole - and give a stable base for the self-levelling compound and LVT?! 

 

I am unsure.
 

 

[Russell griffiths]

Get down on your hands and knees, and get the hoover hose, scratch away at the insulation and hoover at the same time, don’t use anything to damage the pipes. 
put conduit around the pipes and make sure you have 20 mm deep clearance below finished floor level. 
then use a high build floor leveling compound, pour it in and crack open a bottle as you admire your masterpiece. 

[JohnMo]

Ours is just about the same, we have tiles and poured self levelling compound to level with the tiles.

 

 

[Dreadnaught]

Fabulous, thanks guys.

I am not sure I can match the high-levels of workmanship on display in both those, but I will do my best!

[Dreadnaught]

A related question …

 

When applying a self-levelling compound across a floor, what do you use at the door threshold as a barrier to limit the flow?

[Russell griffiths]

  On 17/10/2024 at 18:27, Dreadnaught said:

A related question …

 

When applying a self-levelling compound across a floor, what do you use at the door threshold as a barrier to limit the flow?

Expand  

More context needed. Why are you pouring in one room and not the other

do you have different floor finishes at different thickness so need to raise one more than the other. 

[Dreadnaught]

  On 17/10/2024 at 18:44, Russell griffiths said:

More context needed. Why are you pouring in one room and not the other

do you have different floor finishes at different thickness so need to raise one more than the other. 

Expand  

 

Oh, because I am not going to do the whole house in one go. I am thinking two rooms at a time.

 

Usually it will be the same thickness on each side of the threshold.

 

The only possible exception is the Plant Room to Utility Room threshold. I might use floor paint in the Plant Room, but LVT (3mm) on top of self-levelling compound (3mm) in the neighbouring Utility Room.

[Russell griffiths]

  On 17/10/2024 at 18:49, Dreadnaught said:

 

Oh, because I am not going to do the whole house in one go. I am thinking two rooms at a time.

 

Usually it will be the same thickness on each side of the threshold.

 

The only possible exception is the Plant Room to Utility Room threshold. I might use floor paint in the Plant Room, but LVT (3mm) on top of self-levelling compound (3mm) in the neighbouring Utility Room.

Expand  

TBH whoever is laying your LVT should do the leveling, it’s not as easy as it looks, and is easy to cock up. 

[Dreadnaught]

  On 17/10/2024 at 18:52, Russell griffiths said:

TBH whoever is laying your LVT should do the leveling

Expand  

 

That would be me then. Do you have any LVT at yours? I cannot imagine you would give the job to anyone else.

[scottishjohn]

watching my flooring people do my LVT  

they have been very particular about a few things 

 firstly after doing the self levelling coat it was then ground flat with a thing that looked like a floor polisher with a vacum attached 

 then nothing more was done until the mositure content in floor was down to 3.5%

they were very particlar about this as they insist that this is the main reason for delamination of LVT 

they could have used a different system which would have added anothe £900 to the job to allow the floor to be laid anything up to 5%

 

 

[Dreadnaught]

Very interesting @scottishjohn.

[scottishjohn]

there is more cost in the laying of it than buying the lvt

 

but if you look at my thread  you will see what they have done so far ,as ground floor is still drying out 

 is first class