I recently had two deck mounted Velux skylights installed while having the roof on a 1900's farmhouse stripped and reshingled. These are the smallest model of the old step flashed style skylights using the Velux flashing kits. I noticed that the roofer didn't use ice and water to lap from the roof deck up the skylight flange prior to installing the step flashing. I have inspected the step flashing and it appears to be propery installed. However, when prepairing to install the interior trim I noticed a sliver of light being reflected up the step flashing onto the top curb of the skylight indicating a gap in the flashing. I am wondering if this is normal or if I need to strip the shingles, remove the flashing and wrap the unit with ice and water as stated int he instructions?