Garage Door System GuideC.H.I. Overhead Doors builds steel sectional doors for homes and businesses. The company documents its insulation choices, steel sourcing, and per-model R-values. Its insulated sandwich line spans polystyrene and polyurethane cores across several thicknesses.
Insulation Levels and Steel
C.H.I. states that it offers three insulation levels: non-insulated, polystyrene, and polyurethane, and that polyurethane provides the highest R-value and best thermal performance. The company notes its doors are primarily constructed from sustainable Nucor steel.
Insulated Sandwich R-Values
On its insulated sandwich construction, C.H.I. publishes a range of R-values from R-10.29 to R-26.89 across models. The company lists Model 3212 at an R-value of 17.54 with a 2 inch polyurethane section in 20 gauge steel, and Model 3236 at an R-value of 26.89 with a 3 inch polyurethane section.
C.H.I. lists its polystyrene sandwich models, such as 3281 and 3282, at an R-value of 10.29 in 24 gauge steel with a 2 inch section thickness.