Self-level a hallway for the first time with underfloor heating.

[Jockose]

I'm going to try self-leveling compound for the first time in my life.
The room is my hallway where I've torn up tiles, so there's a concrete floor.
In the middle of the hallway, I've torn down a wall and removed a board that was part of the old door frame, so I have a hole about 8 cm deep there.

Since I plan to do this myself, I've planned the task as follows:
The evening before:
Primer

The next day:
The electrician comes to lay the electric floor heating and connects it.

Afternoon/evening:
Self-leveling compound

Is this the correct sequence? I feel like I don't need to lay reinforcement mesh, is that right or wrong?

Then I'm wondering about the hole in the floor after the door threshold. Should I fill it with something before the self-leveling compound, or will I be able to fill this well with the compound?

And how do I get everything perfectly flat since I don't need any slope?
Do I need to use level pegs?
I've calculated to use about 7mm of self-leveling compound.

 

[anders07]

What type of underfloor heating are you considering that fits in just 7 mm of self-leveling compound?

Normally, you place the reinforcement underneath to attach the electric cable to and then apply the self-leveling compound on top of that.

 

[Stefan N]

Count on double the height of the flytspackel.

 

[Steinmeister]

You don't need to reinforce if the underfloor is stable. You glue the underfloor heating with melting directly onto the concrete. I would have used leveling pins that I've cut to the height I plan to have the floor. When the pins are just barely visible, you're at the level.

Buy a fiber-reinforced filler, follow the mixing instructions carefully. You can use a wide notched trowel to smooth it out if necessary.

 

[Jockose]

The base is a cast concrete slab.
Just talked to the electrical company that will install the underfloor heating, Ebeco Cable kit 200, which is only 4mm. And they say no reinforcement is needed.

anders07 and Stefan N: Considering that the cable is only 4mm and will be glued to the concrete, no more than 7mm of levelling compound is needed.

On this, I will then lay tiles..

 

[Jockose]

You don't need to reinforce if the subfloor is stable. You attach the underfloor heating to the concrete by melting. I would use leveling pins that I've cut to the height I've planned for the floor. When the pins are just barely visible, you're at the right level.

Buy a fiber-reinforced filler, follow the mixing instructions carefully. You can use a wide notched trowel to even it out if needed.

thanks for the tips... I've read that fiber-reinforced filler is recommended for underfloor heating, so I will use that. Just need to find the right brand to make it work well.