ISO-PLA-07 — Ground floor on a concrete slab
1. Subject and scope of application
This specification sets out the technical requirements for quality, execution and acceptance for the build-up “Ground floor on a concrete slab”, in accordance with Isoflect construction detail ISO-PLA-07. Floor Pro on the concrete slab, underfloor heating on studded panels, parquet.
The specification covers the supply and installation of the Isoflect products in the build-up: Isoflect Floor Pro and Isoflect Power Tape. It applies to new constructions and renovations where the design provides for this build-up, and is to be read together with the CAD detail and the technical data sheets of the products.
2. Build-up
Sequence of layers, as per the CAD detail: ground → interior.
| No. | Layer |
|---|---|
| 1 | Compacted crushed stone bed |
| 2 | Extruded polystyrene XPS 180 mm |
| 3 | Concrete slab 120 mm |
| 4 | Isoflect Floor Pro — vapour and radon barrier |
| 5 | Studded panels + PE-Xa 16 mm pipes + 45 mm rough screed |
| 6 | Levelling screed 15 mm |
| 7 | Parquet underlay 3 mm |
| 8 | Parquet 14 mm |
3. Materials and required characteristics
Isoflect Floor Pro
| Characteristic | Value | Standard |
|---|---|---|
| Emissivity | 0,05 | |
| Reflectivity of thermal radiation | 95–97 % | |
| Thermal conductivity, λ₁₀ | 0,0347 W/(m·K) | EN 12667 |
| Water vapour diffusion resistance, Sd | > 1500 m | EN 1931 |
| Total thickness | 6 mm | EN 823 |
| Roll dimensions | 1 m × 40 m — 40 m² | EN 822 |
The values are those published on the Floor Pro product page; the complete documentation is supplied on request.
Isoflect Power Tape
| Characteristic | Value | Standard |
|---|---|---|
| Width | 10 cm | |
| Roll length | 50 m | |
| Service temperature range | −60 … +140 °C | |
| Required for Floor Pro | One roll for each roll of Floor Pro (40 m²) |
The declared values refer to the product, not to the build-up in which it is installed; the performance of the system is determined by a hygrothermal calculation for each case. The current revision of the technical data sheet shall always apply.
Materials in the build-up that are not Isoflect products (timber, boards, metal profiles, roof coverings, waterproofing, screeds, finishes) shall be specified by the designer, in accordance with the applicable product standards and the manufacturers' documentation.
4. Delivery, storage, handling
The products are delivered in their original, labelled packaging, accompanied by the quality documents and, where issued, the declaration of performance. On receipt, the product designation, the roll dimensions or the contents of the package, and the integrity of the packaging are checked.
For Isoflect Floor Pro, the storage conditions are taken from the product documentation, supplied on request.
Isoflect Power Tape is kept in its original packaging, in covered areas, protected from moisture and from direct solar radiation.
The membranes are handled so that the aluminium faces are not perforated or damaged; damaged areas are repaired before the layer is closed.
5. Execution conditions and sequence
Execution begins only after the load-bearing structure has been completed and checked, and the installation surfaces are clean and dry. The layers are executed in the build-up order shown in detail ISO-PLA-07; each layer that is to be covered is checked before being covered. Isoflect products are installed in accordance with the technical data sheets in force.
Isoflect Floor Pro is installed on a clean and dry substrate, in the position shown in the detail. Joints are sealed with Isoflect Power Tape — one roll for each roll of Floor Pro, in accordance with the Power Tape data sheet. The Floor Pro installation documentation is supplied on request.
Isoflect Power Tape is applied on a clean, dry and dust-free surface, pressing firmly along the entire length of the joint. Membrane overlaps are covered completely, so that the vapour barrier is continuous; perimeter junctions, penetrations and openings are sealed with the same tape.
6. Checks during execution and at acceptance
On receipt of the materials, the following are checked: the designation and type of the products, in accordance with the design; the current revision of the technical data sheets; the roll dimensions and the contents of the packages; the integrity of the packaging and of the aluminium faces.
During execution, the following are checked:
- for Isoflect Floor Pro: the clean and dry substrate and the sealing of the joints.
Before each layer is covered (plasterboard, OSB, roof boarding, screed, roof covering), a record of concealed works shall be drawn up in accordance with the regulations in force. Acceptance upon completion of the works shall be based on the records of concealed works, the quality documents of the products and the visual inspection of the accessible layers.
7. Measurement and settlement
The Isoflect membranes (Isoflect Floor Pro) shall be measured in m² of covered area, as developed, without separate inclusion of the overlaps; overlaps, fixings and technological losses are included in the unit price.
Isoflect Power Tape is included in the unit price of the sealed membrane or is measured separately, in rolls of 50 m, as established in the bills of quantities.
The other layers (structure, profiles, boards, roof coverings, waterproofing, screeds, finishes) shall be measured and settled in accordance with the relevant work chapters.
8. Reference documents
- Isoflect construction detail ISO-PLA-07 — PDF, DXF and IFC, from the library for designers.
- Isoflect Floor Pro documentation, provided on request.
- Technical data sheet Isoflect Power Tape, revision 4, 13.09.2026.
- Test standards cited in the technical data sheets: EN 12667, EN 1931, EN 822, EN 823.