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Wolle for Posi Joist beams
Wolle P1500 and P2100 boards, 10 cm thick and 3 m long, cut to the void of each model, from PS8 to PS16. The beam leaves the factory already insulated.
Technical content: Bogdan Ivănescu, graduate engineer, PhD candidate at the Technical University of Cluj-Napoca · updated on 16.10.2026
Less labour on each beam
Reduced labour
The labour time for manufacturing an insulated beam decreases in direct proportion to the time spent cutting conventional insulation, for example stone wool.
Delivered to size
3 m boards, dimensioned to the void of each model. The only intervention required is trimming at the ends.
Zero material waste
Dimensioning to the model eliminates offcuts and cutting waste.
Permanent fixing, without gaps
The board is slightly wider than the height of the void: it is fixed permanently between the flanges, without leaving gaps.
Resistant to transport
The material does not degrade with moisture, nor with accidental exposure to the weather.
Guaranteed quality
Each beam leaves the factory fully filled, and the floor slab is insulated much more simply on site.
Wolle, the thermal insulation fibre
Without binders
Without binders, formaldehyde or phenol.
Hydrophobic and stable
It does not absorb moisture and does not settle.
λ₁₀ 0.038 / 0.035 W/mK
P1500 / P2100, in accordance with SR EN 12667.
Reaction to fire C-s2,d0
In accordance with EN 13501-1. Sound-absorbing.
P1500 or P2100, for PS8 – PS16
| Beam | Clear void | Board (width × length × thickness) | Product | R (m²K/W) | Product | R (m²K/W) |
|---|---|---|---|---|---|---|
| PS8 | 108 mm | 120 mm × 3 m × 10 cm | Wolle P1500 PS8 board | 2,84 | Wolle P2100 PS8 board | 3,09 |
| PS9 | 131 mm | 140 mm × 3 m × 10 cm | Wolle P1500 PS9 board | 3,45 | Wolle P2100 PS9 board | 3,74 |
| PS10 | 159 mm | 170 mm × 3 m × 10 cm | Wolle P1500 PS10 board | 4,18 | Wolle P2100 PS10 board | 4,54 |
| PS12 | 210 mm | 220 mm × 3 m × 10 cm | Wolle P1500 PS12 board | 5,53 | Wolle P2100 PS12 board | 6,00 |
| PS14 | 279 mm | 290 mm × 3 m × 10 cm | Wolle P1500 PS14 board | 7,34 | Wolle P2100 PS14 board | 7,97 |
| PS16 | 327 mm | 340 mm × 3 m × 10 cm | Wolle P1500 PS16 board | 8,61 | Wolle P2100 PS16 board | 9,34 |
All boards are 10 cm thick and 3 m long. R is the thermal resistance of the insulation within the beam, in the direction of heat flow through the floor slab: R = clear void / λ₁₀; it does not include the timber flanges. The width of the board slightly exceeds the void between the flanges, for permanent fixing; the 10 cm thickness covers the internal width of the beam, of 95 mm.
Three operations
1. Inserting the board
The 3 m board bearing the name of the beam (for example Wolle P1500 PS16 for PS16) is inserted between the flanges, along the length of the beam, and fixed by pressing.
2. Trimming at the ends
The only cut required, to the length of the beam.
3. Service openings
These are made by notching, at the locations of the service routes. No other operation is required.
The beams arrive on site already filled
Fully filled beams
The insulation is installed in the factory, on each beam, without gaps.
Simpler execution on site
On site, only the space between the beams remains to be insulated.
Samples and a quotation for your models
Tell us which models you produce and in what volumes. We will send you board samples and the quotation for both options, P1500 and P2100. Transport is calculated separately.
See and touch the products before ordering
The Isoflect sample pack contains samples of the reflective membranes and of Wolle wool insulation, so that you can compare the materials at home or on site.