05 · CHAPTER 05 · LAYERS & CONSUMPTION Chapter 05 · Layers & consumption
Which layers make up the facade system?
The facade system consists of a primer, a functional layer and a top coat. This chapter summarises the layers with their tasks, consumption figures and thicknesses as a planning overview.
Which layers does the system consist of?
The primer PSC 250 T ECB BASIC B, the thermoreflective functional layer PSC 250 T BUILD and the top coat PSC 250 T ECO OUTSIDE.
Which layer thicknesses are intended?
Primer approx. 0.1 mm, functional layer 1.0 mm (in two passes of 0.5 mm each) and top coat 0.1–0.2 mm — together a total thickness of approx. 1.2 mm. The figure of 1 mm stated in the technical data sheet refers to the functional layer.
Layer overview (consumption and function)
| Layer | Product | Consumption¹ | Thickness | Task |
|---|---|---|---|---|
| Primer | PSC 250 T ECB BASIC B | 100–200 ml/m² | approx. 0.1 mm | adhesion, corrosion and condensation protection |
| Functional layer | PSC 250 T BUILD | approx. 0.9 l/m² | 1.0 mm (2 × 0.5 mm) | thermoreflective, insulating intermediate layer |
| Top coat | PSC 250 T ECO OUTSIDE | 0.18–0.30 l/m² | 0.1–0.2 mm | weather/UV protection, decorative finishing coat |
| Complete system | — | — | approx. 1.2 mm | sum of the three layers |
¹ Guide values per coat, depending on the porosity and absorbency of the substrate; the actual consumption must be determined per object. The functional layer is applied in two passes of 0.5 mm each; the figure of 1 mm stated in the data sheet refers to the functional layer. Detailed values per product in Chapters 07–09.
Common properties of the layers
| Property | Value |
|---|---|
| Binder | aqueous acrylic resin dispersion (water-thinnable) |
| Reaction to fire | B-s1, d0 per EN 13501-1 |
| Total system thickness | approx. 1.2 mm |
Vapour permeability is not a property that is identical across all layers: the BUILD functional layer on its own is class V1, the ECO OUTSIDE top coat class V2. For the overall build-up in combination (primer 0.1 mm + functional layer 1.0 mm + top coat 0.1 mm), the calculated series connection of the diffusion resistances yields a system value of sd ≈ 0.44 m, corresponding to class V2 per EN 15824 — see the manufacturer information “Calculated system value for water-vapour permeability” (Nanofassadendämmung system page).