SLX Sheathing is an extruded polystyrene (XPS) board that gives you an edge on moisture resistance and thermal performance. With an R-Value of 5.0 per inch of thickness, it is an ideal thermal insulator that increases a home’s energy efficiency. And because it’s made of XPS, the board doesn’t absorb water, allowing it to retain its insulating properties over time. SLX has interlocking shiplap edges that reduce energy-robbing seams and gaps, while also providing an extra barrier against moisture infiltration. Tough film facers on both sides of the board produce greater durability and less waste.
|Thermal Resistance, R-Value|
|ASTM C 518|
(@ 75ºF Mean Temperature)
(Max.% by Volume)
|ASTM C 272||0.1||0.1||0.1
|ASTM E 84/UL 723||1.0|
|Max. Recommended Use Temp.|
|Board Dimensions||4' x 8'||4' x 8'||4' x 8'||4' x 9'||4' x 9'
Specimens were aged and tested in accordance with FTC Rule (16 CFR, Part 460) and ASTM C578 (1" only). 2
These numerical flame spread and smoke ratings are not intended to reflect hazards presented by this material under actual fire conditions. See UL Classification Certificate A183.