A 20 by 30 foot metal shop with 12 foot walls and a 6/12 gable roof. Walls, gables and roof deck sprayed at 2.5 inches of Heatlok HFO High Lift closed-cell, 1,972 square feet at R-18.5.
Scope
| Surface | Area | Closed-cell thickness | Est. R-value |
|---|---|---|---|
| Walls | 1,076 ft² | 2.5" | R-18.5 |
| Gables | 225 ft² | 2.5" | R-18.5 |
| Roof deck | 671 ft² | 2.5" | R-18.5 |
| Total treated | 1,972 ft² | 2.5" | R-18.5 |
Why two and a half
A small shop that will be heated on and off through the winter. The steep 6/12 roof puts a lot of the envelope overhead, where warm air collects and condensation on a cold metal deck is the first thing an owner notices. Two and a half inches lands the assembly at R-18.5, comfortably past the vapor-retarder threshold on the roof deck, and at 88% heat-loss reduction on the hot-box curve, without paying for the fourth and fifth inches that would not change how the building feels.
R-values are nominal manufacturer values (aged, ASTM C518) as quoted on the data sheet, not a guarantee of energy savings. Customer names withheld.