With its unique fiberglass reinforced foam core, Thermax™ (ci) Exterior Insulation delivers one of the highest R-values available for immediate insulation and weather protection on the job site.
DuPont™ Thermax™ (ci) Exterior Foam Insulation* is a moisture-resistant, durable and lightweight extruded polystyrene foam board with shiplap edges designed specifically to be used as a continuous insulation (ci) and installed over block, concrete or metal stud backup behind masonry or stone veneers. Manufactured with a patented carbon-black technology, Styrofoam™ Brand Ultra SL Insulation features an R-value of 5.6 per inch (RSI of 0.97 per 25 mm)**, the highest of all extruded polystyrene foam insulation products. With its closed-cell structure offering advanced long-term thermal performance and moisture control, Styrofoam™ Brand Ultra SL Insulation with shiplap edges maximizes the performance of the entire wall assembly.
|Easy to cut, handle, and install||
|Thermal Resistance1||ASTM C518||R-value, min||6.5|
|Compressive Strength2||ASTM D1621||psi, min.||25|
|Water Absorption||ASTM C209||% by volume, max.||0.1|
|Water Vapor Permeance3||ASTM E96||perm, max||<0.04|
|Maximum Use Temperature||-||°F||250|
|Flexural Strength||ASTM C203||psi, min.||55|
|Flame Spread||ASTM E84||-||25|
|Smoke Developed||ASTM E84||-||<450|
1 Aged R-value at 1” of cured foam @ 75°F mean temperature. R-value expressed in ft2 •h•°F/Btu. R-value determined by ASTM C518 using the aging process in ASTM C1289 (90 days @ 140°F).
2 Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first.
3 Calculated flammability values for this or any other material are not intended to represent hazards that may be present under actual fire conditions.
|Thickness (in.)||R-Value||Board Size (ft.)||Edge Treatment|
|Thermax™ (ci) Exterior Foam Insulation||0.625||4.1||4 x 8, 4 x 12||Square Edge|
|1.0||6.5||4 x 8, 4 x 12||Square Edge|
|1.55||10.1||4 x 8, 4 x 12||Shiplap|
|2.0||13.0||4 x 8, 4 x 12||Shiplap|