Specification teams choose ROCKWOOL when cavity and continuous insulation must deliver published thermal conductivity, Euroclass A1 non-combustible fire resistance rating pathways, and NRC-class acoustic absorption without trading moisture durability for schedule speed.
Each capability below maps to a decision gate architects, fire consultants, and procurement managers close before insulation packages freeze on bid day.
ROCKWOOL stone wool is tested to ASTM E136 and classified Euroclass A1 under EN 13501-1, giving facade and shaft assemblies a non-combustible fiber matrix that does not feed fire load. Specifiers use this pathway when jurisdictions tighten combustible cladding rules and insurers demand listed fire resistance rating packages.
NRC values from 0.95 to 1.05 across designated boards and batts help teams hit STC rating targets in party walls, mechanical rooms, and open offices. Fiber geometry attenuates mid-frequency noise while thermal bridging at studs stays controlled by continuous insulation layers.
Published lambda values from 0.033 to 0.040 W/(m·K) let energy modelers lock R-value packages before HVAC tonnage is over-specified. Dimensional stability under cyclic temperatures keeps board joints from opening and creating unexpected thermal bridging paths.
Water-repellent treatments retain less than 1% moisture by volume under ASTM C1104 protocols on designated products. Moisture vapor transmission remains vapor-open enough for drying potential in rainscreen and cavity walls—addressing the natural-versus-engineered debate with data instead of slogans.
Side-by-side values for specification writers comparing ROCKWOOL batts against stone wool boards when thermal conductivity, fire resistance rating, and compressive strength govern the wall or roof detail.
| Parameter | ROCKWOOL Batt Insulation | ROCKWOOL Board / Panel |
|---|---|---|
| Typical R-value per inch | R-3.8 to R-4.3 | R-4.0 to R-4.3 |
| Thermal conductivity (λ) | 0.035–0.040 W/(m·K) | 0.033–0.037 W/(m·K) |
| Fire resistance pathway | Euroclass A1 / ASTM E136 non-combustible | Euroclass A1 with rainscreen & shaft assemblies |
| NRC / acoustic role | Cavity packs for STC 50–55 assemblies | NRC 0.95–1.05 on designated boards |
| Compressive strength | Friction-fit in stud cavities | Suitable for rainscreen planes & roof overlays |
| Water absorption rate | <1% by volume on treated batts | <1% by volume; drains in ventilated cavities |
| Primary construction use | Wood & steel stud cavities | Continuous insulation, roofs, industrial ducts |
| Prefabrication fit | Panelized wall packs with traditional framing | Factory-cut boards for modular envelope kits |
Documentation limits: values are typical published ranges for designated constructions. Project submittals must cite the active SKU sheet (EN 13162 / local listing). Boards under sustained point loads, batts over-compressed in thin cavities, and assemblies without a drained rainscreen plane fall outside these compare rows—request engineer review before freezing the insulation package.
From mid-rise commercial shells to process plants, ROCKWOOL stone wool packages align thermal, acoustic, and fire criteria with the roles who sign off on submittals.
Share your R-value target, fire resistance rating pathway, and acoustic goals. Our desk returns published lambda values, EN 13162 references, and mill window guidance—not a generic brochure dump.
