If you have the house plans, upload them. We read the dimensions, areas and structure and complete the configuration; then check the values read. This step is optional.
or drag them here · PDF, JPG, PNG, WEBP · up to 10 files, 25 MB in total
The plans are read automatically by an artificial intelligence service and are not kept after reading.
Step 2
The house
External dimensions of the house. Areas are calculated automatically and you can correct them for each element.
Step 3
Build-up of each element
Choose the option for each element. The list shows the layers in order.
Floor over crawl space
calculated from dimensions
Layers, from bottom to top
1Fibre-cement board or metal sheet; a wire mesh against rodents is also recommended
2Reflectiva Roof Pro, diffusion side down (reflective faces outwards)
Both Multistrat layers are sealed with adhesive tape; overlapping is not required.
The service zone takes the installations without interrupting the insulation and becomes an insulating layer itself, with the insulation continuous and hermetically sealed.
Where the thickness includes a 5 cm layer (P800), that layer is always fitted first: it holds itself in place better.
On the ventilated facade, external insulation starts at Wolle P800 (5 cm); for greater thickness, P1500 or P2100 is added.
Internal partition walls
calculated from dimensions
Layers, from inside to outside
1Plasterboard; for better sound insulation, two acoustic plasterboards
The service zone takes the installations without interrupting the insulation and becomes an insulating layer itself, with the insulation continuous and hermetically sealed.
Where the thickness includes a 5 cm layer (P800), that layer is always fitted first: it holds itself in place better.
Loft roof
calculated from dimensions
calculated from dimensions
Layers, from bottom to top
1Plasterboard
2Reflectiva Multistrat, fitted before the lining
3Service zone: battens or profiles, with the installations
Reflectiva Gold is not overlapped: strips are butted and the joints are sealed with tape. Fix with 14–16 mm staples or 1.5 cm wood screws.
The service zone takes the installations without interrupting the insulation and becomes an insulating layer itself, with the insulation continuous and hermetically sealed.
Where the thickness includes a 5 cm layer (P800), that layer is always fitted first: it holds itself in place better.
A ventilation gap at the eaves and at the ridge is mandatory.
Roof Pro and Roof Eco rolls are laid parallel to the eaves; overlaps are bonded with their double-sided adhesive strips. Roof Pro is fitted on pitches of at least 15°.
Step 4
Isoflect products required
Quantities are rounded to whole rolls and packs and include a 7% margin for overlaps and waste. On the attic floor, consumption is 1:1, without margin.
Product
Packaging
Required (m²)
Quantity
Reflectiva Roof Pro
75 m²
223.9
3 rolls
Reflectiva Roof Eco
75 m²
128.9
2 rolls
Reflectiva Gold
12 m²
111.7
10 rolls
Reflectiva Multistrat
30 m²
455.1
16 rolls
Reflectiva Titan
40 m²
171.2
5 rolls
Wolle P800
5 cm · 11.712 m² · 16 × 1.20 × 0.61 m
257.8
23 packs
Wolle P1500
10 cm · 5.856 m² · 8 × 1.20 × 0.61 m
694.8
119 packs
By element
Floor over crawl space 80.0 m²
Reflectiva Roof Pro: 85.6 m² · Reflectiva Titan: 85.6 m² · Wolle P1500: 171.2 m²
External walls 120.5 m²
Reflectiva Multistrat: 257.8 m² · Wolle P800: 257.8 m² · Wolle P1500: 128.9 m² · Reflectiva Roof Eco: 128.9 m²
Internal partition walls 0.0 m²
Intermediate floor 80.0 m²
Reflectiva Multistrat: 85.6 m² · Reflectiva Titan: 85.6 m² · Wolle P1500: 171.2 m²
Loft roof 104.4 m² · 129.2 m²
Reflectiva Multistrat: 111.7 m² · Reflectiva Gold: 111.7 m² · Reflectiva Roof Pro: 138.3 m² · Wolle P1500: 223.5 m²
The timber structure (studs, joists, rafters), boards, finishes and sealing tapes are not part of this calculation.
The calculation is indicative and based on the areas entered. The final build-up and quantities are confirmed during the consultation, on the house design.
