VELUX Additional Step Flashing for Skylights Style:EDL Deck Mount it provides more comfort by

it provides more comfort by keeping the interiors cooler in the summer and somewhat warmer in the winter

with stapling flanges provided

More efficient than standard caulks

Can be applied to the exterior or interior of exterior walls

polyurethane foam sealant is a closed-cell

VELUX Additional Step Flashing for Skylights Style:EDL Deck Mount it provides more comfort byStep flashing is designed to interweave with roofing material for proper water drainage. Additional step flashing pieces are sometimes required for shakes and other thick roofing materials. The ZZZ 200 is designed to be installed with VELUX curb mount (model ECL) and deck mount (model EDL) flashing kits. Key Features: Appropriate flashing kit must be purchased and installed properly with VELUX skylights to benefit from the 10 year "No Leak"