Truefoil is a Type 2 Expanded Polystyrene (EPS) rigid insulation manufactured to CAN/ULC-S701 standard.
Truefoil is R4 per inch and a minimum compressive strength of 16psi.
Designed for installation under siding to provide a thermal break.
Stock sizes are 1" and 1 1/2" x 4' x 8' sheets, custom sizes up to 4" thick are available.
Truefoil is laminated with perforated foil on both sides.
Install with taped seams to provide an air barrier.