What Soprema makes — and what LPT does not invent
SOPREMA inc., 1688 Jean-Berchmans-Michaud, Drummondville, Quebec. Insulation boards, not camp modules. LPT integrates a target supply chain. Not exclusive. Not an LPT plant.
SOPRA-ISO: closed-cell polyiso, organic glass-fibre facer. SOPRA-ISO PLUS: polymer-coated glass facers. Sizes 4×4 and 4×8 ft. Thickness 1–6 in; SL (shiplap) up to 8 in. Density ~2.0 pcf. 20 or 25 psi.
SOPRA-XPS: extruded polystyrene. Long-term R about 5.0 per inch even in the cold. XPS 20 for walls; 30 for foundations; 40/60/100 for heavy load and inverted roofs.
Study target R-40 / R-50
SOPRA-ISO LTTR is at 24 °C. Polyiso loses R below −10 °C. Soprema claims a better cold curve than typical Canadian polyiso — not R-5.7 at −40 °C. The study stacks polyiso inside and XPS outside.
- Wall: 2 × 76 mm SOPRA-ISO PLUS, staggered (~R-34.8 at 24 °C) + 51 mm SOPRA-XPS 20 continuous (~R-11.0). Nominal ~R-46 at 24 °C. Winter effective target: R-40 after polyiso derate.
- Roof: 2 × 76 mm SOPRA-ISO PLUS + 12.7 mm PLUS HD + Soprema membrane on the sealed file. Roof target R-50 in layers.
- Floor / piles: SOPRA-XPS 40 or 60 under the module — compression and moisture, not polyiso on grade.
- Soprema wants multiple layers to cut thermal bridging. One 8-inch board is not the study detail.
Service temperature and nordic job
SOPRA-ISO+ sheet: −40 °F to 250 °F. That allows the use. It does not seal the NBC U-calculation. U-values, bridges, Parker module joints and blower-door (< 1.0 ACH@50 Pa plant target) stay with the OIQ file.
Boards ship from Drummondville. They are not a CSA A277 structural sandwich. Structure is the module. Soprema is the thermal core of the envelope.
Published Soprema LTTR (24 °C) — not jobsite R at −40 °C
| Product | Thickness | LTTR / RSI | Standard |
|---|---|---|---|
| SOPRA-ISO / PLUS | 25.4 mm (1 in) | R-5.7 / RSI 1.00 | CAN/ULC S770, ASTM C1289 |
| SOPRA-ISO / PLUS | 50.8 mm (2 in) | R-11.4 / RSI 2.01 | Grade 2 (20 psi) or 3 (25 psi) |
| SOPRA-ISO / PLUS | 76.2 mm (3 in) | R-17.4 / RSI 3.06 | Closed-cell polyiso core |
| SOPRA-ISO / PLUS | 101.6 mm (4 in) | R-23.6 / RSI 4.15 | Multiple layers recommended |
| SOPRA-XPS 20 | 25.4 mm (1 in) | R-5.39 LTTR / R-5.0 aged | CAN/ULC S701.1 Type 3 |
| SOPRA-XPS 20 | 76.2 mm (3 in) | R-16.64 / RSI 2.93 | Above-grade walls, shiplap |
| SOPRA-XPS 20 | 101.6 mm (4 in) | R-22.49 / RSI 3.96 | Holds R in the cold better than polyiso |
| SOPRA-ISO PLUS HD | 12.7 mm (½ in) | R-2.5 | Cover board, 80–110 psi |
