Laying insulation directly on concrete floor?

[justusandersson]

When was the house built? Do you have any blueprints? I think the slab looks too dry to be uninsulated.

 

[LGV]

79 thinks it is insulated but no drainage exists around the house

 

[justusandersson]

Drainage is not a critical issue in this context. If the ground is of a draining type, drainage pipes are not necessary. Moisture in foundation slabs is almost always a result of the absence of insulation underneath. Then, water vapor from warm indoor air condenses in the slab. I think there is a lot to suggest that the slab is insulated. In that case, you can place insulation directly on the concrete. The best would be to have a drawing to confirm this.

 

[LGV]

Drainage is not a crucial issue in this context. If the ground is of a draining type, it is not necessary to have drainage pipes. Moisture in concrete slabs is almost always a result of the absence of insulation underneath. Then, water vapor from warm indoor air condenses in the slab. I think there is much to suggest that the slab is insulated. In that case, you can place insulation directly on the concrete. Ideally, a drawing would confirm this.

Okay, thanks for the response, I might chase down a drawing. When I tore it up, I didn’t see anything noteworthy, but the threshold to the balcony door had absorbed moisture, which is why I opened the floor.

 

[Stefan1972]

Was there something wrong with the loose fill insulation that was there? If it's dry and fine, you can just continue with the same concept, perhaps just sealing a bit more outside the walls and supplementing with more equivalent material.