What should an ice and water shield installation guide cover?
Valleys
Center a full 36 inch sheet in the valley, pressing it into the crease without bridging, so it lies tight to both slopes. Start at the bottom and lap upper pieces over lower ones. Keep shingle nails away from the valley center, as the shingle instructions specify.
Pipes and vents
Cut a square of membrane with a hole sized to the pipe, slide it over, and press it down. Some installers add a second piece above it lapped downward. The pipe boot then goes over the membrane.
Chimneys
Apply membrane to the deck around the chimney and turn it up the masonry several inches, using primer on the brick if the manufacturer requires it. The step flashing and counterflashing go over it. See chimney leaks and crickets.
Skylights
Follow the skylight maker's instructions first; many specify membrane around the curb before the flashing kit. See replacing skylights with the roof.
Roof-to-wall joints
Run a strip along the joint, lying on the deck and turned up the wall behind the house wrap or siding. Step flashing goes over it with each shingle course.
Eaves and low slopes
Start at the eave over the drip edge and work upslope. Low-slope sections may need full coverage.
Conditions
- Clean, dry deck within the product's temperature range.
- Primer on masonry, metal or dusty surfaces where required.
- Laps rolled firmly; covered within the exposure limit.
How flashing pieces fit with the membrane is covered in roof flashing explained.