ᐅ Proper Floor Construction in an Utility Building with Brick Paving?

I have been thinking for months about how to construct the floor in my utility building. Until now, there was a 30 cm (12 inches) concrete slab with topsoil underneath. On rainy days, certain areas of the concrete would become damp.

I have now installed a masonry damp-proof course around the entire building. The concrete floor and soil have been removed. The room will be used as a party room and will only be accessed by people. It will be heated by a fireplace. The heat should not dissipate quickly through the floor.

The new floor will be covered with clinker bricks.

Now, the big question: the construction layers?

My idea:
- Level and compact gravel
- Plastic sheet (Katja Sprint) or similar as a vapor barrier against potential moisture
- Geotextile or similar protective mats
- Crushed stone
- Styrodur insulation (for thermal insulation to avoid a cold floor)
- Fine gravel (split)
- Clinker bricks

What do you think?