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Question DetailsAsked on 9/15/2013

what is an icesheild for skylights

had my roof done and nobody suggested replacing skylights or icesheilds

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1 Answer


If the skylights have no problems and the roofer was careful around them, there is no reason to replace them. A proper roofing job would have replaced or overlaid (using proper procedure) the existing flashing and installed new ice and water shield around the skylight base.

Ice and water shield is a peel and stick sheet asphaltic waterproofing and ice dam protection material used as waterproofing around penetrations like vents, skylights, windows and doors; and also in valleys and along the bottom edge of the sheathing to protect against water backups from debris buyildup or ice damming getting under the shingles. Looks like this (being used in a valley here) -

For skylights, they basically "diaper" the base of the skylight with it to seal the interface between the roof and the skylight, by diverting any water getting to that point back out on top of the shingles a bit lower down the roof along the bottom edge of the skylight. Picture of sample installation here, except they should have use wider ice and water shield to avoid the seams, and the layer over the top of the window should have totally overlaid the side ones, not butted up against them. Upon shingle installation the bottom piece should overlap the shingles, to redirect any water running over the shield back out onto the top of the shingles rather than running down the rest of the roof underneath them.

The metal flashing then goes over the ice and water shield as the primary waterstop - directing the water out on top of the shingles and hopefully keeping it from getting down to the ice and water shield at all.

Answered 7 years ago by LCD

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