What it covers
Ice & water shield sticks to the deck at eaves, valleys, and often around penetrations. Water that sneaks under shingles hits the membrane instead of the wood.
Code and manufacturer guidelines set minimum widths; New Hampshire freeze–thaw often warrants generous eaves coverage.
Where cheap scopes skip it
- Felt-only eaves on a "budget" package
- Valleys without membrane
- Overlays that never open the eave detail
- Verbal promises with no line item
On our proposals
We name ice & water coverage in Good / Better / Best so you can compare quotes apples to apples.
Pair it with ventilation and drip edge — membrane alone does not fix a hot attic.