Specification-grade thermal envelopes
ASTM-tested fiberglass, mineral wool, polyisocyanurate, and commercial roofing assemblies deliver certified R-values and fire-rated packages architects and mechanical engineers can lock into Division 07 before bid day.
Comparative engineering data
Side-by-side values for specification writers comparing rigid foam boards against stone wool when thermal conductivity, fire resistance rating, and compressive strength govern the wall or roof detail.
| Parameter | JM Polyiso Continuous CI | JM Mineral Wool Board |
|---|---|---|
| Typical R-value per inch | R-5.6 to R-6.0 | R-4.0 to R-4.3 |
| Thermal conductivity (k) | 0.017–0.018 W/m·K | 0.034–0.037 W/m·K |
| Compressive strength | 20–25 psi (grade dependent) | Suitable for rainscreen planes |
| Fire resistance pathway | Pairs with cover boards & membranes | Noncombustible fiber, ASTM E136 path |
| Moisture vapor behavior | Faced boards limit vapor drive | Vapor-open fiber matrix |
| Water absorption rate | Faced cores resist short-term wetting | Fiber drains; design for drying potential |
| STC / acoustic pairing | Pairs with cover boards for roof noise | Cavity packs support STC 50–55 assemblies |
| Primary construction use | Low-slope roof decks & CI walls | Fire-rated walls & cavity fills |
Performance advantages
Published thermal performance maps to ASHRAE climate zones so energy models and plan reviewers share the same numbers.
UL-classified and FM-approved roofing and insulation systems reduce resubmittal cycles when inspectors ask for listed assemblies.
Continuous insulation boards and cavity fills cut conductive paths at studs, purlins, and mechanical penetrations.
Faced batts, vapor-retarder membranes, and roof cover boards help keep condensation risk inside design assumptions.
Mineral wool and duct liner products support acoustic targets without abandoning fire or thermal criteria.
Construction segments
Wall CI, roof polyiso, and acoustic partitions for office and mixed-use cores.
High-temperature pipe and equipment insulation with documented service ranges.
Batt, blown-in, and foam board options aligned to IRC energy code paths.
Duct wrap, duct liner, and pipe insulation for conditioned air systems.
Single-ply membranes over insulation stacks with wind-load listed assemblies.
Low-temperature envelopes balancing R-value with vapor drive control.
Field voices
“We locked JM polyiso and cover-board thicknesses into the energy model early; the R-value package survived plan review without a second thermal bridging addendum.”
“Mineral wool cavity packs from Johns Manville cleared our two-hour partition listing while keeping STC targets the acoustician had already published.”
“Pipe insulation cut sheets with service-temperature tables shortened our mechanical submittal cycle on a food-process plant expansion.”
Send climate zone, assembly type, and fire-rating notes. Johns Manville application engineers return thermal data sheets, roofing stack recommendations, and installation sequencing within one business day.
