Insulating gap between plasterboard and floor

[gambo]

What's the best way to insulate these gaps? We put insulated plasterboard on the walls so don't want to loose the whole benefit of the insulation through these gaps. This particular place will be covered with skirting but it's the same behind kitchen cabinets and no plan for skirting there at the moment (we used to have fridge-like temperature in winter in corner cabinet before renovation).

[saveasteading]

what is the floor construction?

[gambo]

It's open kitchen with concrete floor (late 80s house so none or every little insulation).

Tiles on one side and engineered floor (glued) on. the other.

Floor on the picture is temporary .

Edited September 29, 2025 by gambo

[nod]

Fill it with airtight expanding foam (Blue)

Cut it off in line with the wall once dry 

Edited September 29, 2025 by nod

[gambo]

1 hour ago, nod said:

Fill it with airtight expanding foam (Blue)

Cut it off in line with the wall once dry 

e.g illbruck? That was the plan but i wasn't sure if it will not let moisture/damp transfer up to the wall.

[nod]

1 hour ago, gambo said:

e.g illbruck? That was the plan but i wasn't sure if it will not let moisture/damp transfer up to the wall.

It’s fine we used to use it all the time on new housing sites That was when Air tests where actually carried out 😁

[gambo]

5 hours ago, nod said:

It’s fine we used to use it all the time on new housing sites That was when Air tests where actually carried out 😁

Which one shall I go for? FM310 or FM330?

[Super_Paulie]

FM330 is my go to. Used it all around the entire perimeter and everywhere there is a gap in anything basically. Good stuff.

[Iceverge]

Masking tape along the perimeter would avoid the need to scrape it from the floor too.