Special commercial grade polyurethane Chem-Calk 900 sealant used when installing chimneys and roof jacks. Apply to underside of roof jack flashing during installation and at swivel joint. Best if used when temperatures are above 40 degrees farenheit.
Meets the following specs: ASTM C-920, Type S, Grade NS, Class 25, US Federal Spec TT-S-00230C.
Sorry, this item cannot be shipped out of the USA.