CelluloseFlakes(Blown-In)
Ecological insulator made from grinding and treating waste paper (newspapers). Blown at high pressure into cavities or loose-laid in attics, it provides continuous insulation without thermal bridges, with excellent winter and summer performance at unbeatable cost.
Invisible retrofit. The blown-in insulation uses the typical air cavities of 1960s-80s construction. Cellulose wraps pipes and conduits, hermetically sealing every parasitic draught inside the masonry.
Accessible and circular bio-construction. Transforming the quintessential urban waste (unsold old newspapers) into a high-performance invisible thermal insulation. Cellulose flakes are the ultimate weapon against the cold walls of post-war housing.
Via a ground-floor blowing machine, cellulose is pumped at high pressure through a hose into the air cavities of perimeter walls or sprayed into uninhabitable attics. The airflow guarantees total fill of every crack and gap. The material autonomously engulfs pipes, ties and hidden cables, physically eliminating thermal bridges and blocking destructive convective air movements (wind-washing) inside the masonry.
Unlike synthetic insulators (EPS or polyurethane), high-density blown cellulose (up to 60 kg/m3) has high thermal mass capacity. It works as a thermal flywheel, drastically slowing summer solar heat ingress (over 12-hour phase shift) and keeping the house cool. Being paper, it is treated with boron salts during shredding, making it self-extinguishing (chars slowly), unattractive to rodents and insects, and totally immune to mould.
Standards
European and international references applicable.
Physical properties
Usage environment
SETTLEMENT: blown at high pressure and density (>45 kg/m3), the cellular fibres interlock with each other and the rough brick walls, guaranteeing zero settlement (certified <1%) over the entire building life. ACOUSTIC BONUS: fibrous, soft and highly porous, blown cellulose also acts as a phenomenal acoustic damper, filling resonant voids (drum effect) in drylining partitions and timber floors.
Documented applications
TAV. DCavity Walls (Blown-in)
Rapid 1-2 day retrofit per flat. Holes (40mm) drilled internally or externally without scaffolding or demolition.
Non-habitable Attics
Loose-fill at free depth (e.g. 30-40 cm) on attic floor to block heat escape upwards.
Timber Frame Houses (Platform Frame)
Pressure filling of stud bays between structural spruce studs before OSB or gypsum fibre board closure.
Pitched Timber Roofs
Blown into cavities between the visible internal plank lining and the upper roof boards of ventilated timber roofs.
Specific Thermal Mass Capacity (c in J/kgK)
TAV. EIt is not enough to look at the lambda value (winter cold resistance). In summer, the sun cooks roofs: cellulose (high density x high specific thermal capacity) absorbs the daytime heat wave, releasing it at night when outside temperatures fall, keeping the house cool without air conditioning.
Operational documents from this sheet
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