This impregnated, compressible foam block is for exterior applications and provides a weather tight, airtight, UV stable and insulated primary seal. Once the joint sealant is installed, the material expands and adapts to the width of the joint opening. This cover is available in 12 standard colors and is supplied in 6’6″ lengths. (Note: VF-100 is supplied in 10′ reel length). Joint sizes range from 1″ to 8″. Contact the factory for larger sizes or custom applications.