The self-adhering waterproof membrane installed beneath shingles at the roof’s most vulnerable areas — one of the most important components in any Colorado roof system and a consistently missed code upgrade item in insurance estimates on older homes.
What Ice and Water Shield Is
Ice and water shield is a self-adhering, fully waterproof membrane installed directly over the roof decking before shingles are applied. Unlike standard felt paper or synthetic underlayment — which is mechanically fastened and relies on overlapping seams for water resistance — ice and water shield adheres completely to the deck surface and self-seals around every nail and fastener that penetrates it. This creates a continuous, watertight barrier at the areas of the roof most vulnerable to water infiltration from ice dams, wind-driven rain, and water backup in valleys.
The name tells you exactly what it does. The ice component refers to protection against ice dam backup — water that builds up behind a ridge of ice at the eave and travels uphill beneath shingles under hydrostatic pressure. The water component refers to protection against wind-driven rain that can force water under shingles at eaves and other low-slope areas during storms. Standard underlayment does not provide this protection — ice and water shield specifically does.
In Colorado’s climate — with significant snowfall, freeze-thaw cycling, and intense hailstorms — ice and water shield is one of the most valuable components in any roof system. Its absence on older Colorado homes is a significant vulnerability, and its inclusion during storm-related replacements is both a best practice and, in many situations, a code requirement.
How Ice and Water Shield Works
The performance difference between ice and water shield and standard underlayment comes from two specific design features:
Full Adhesion
Ice and water shield is coated on its underside with a rubberized asphalt adhesive that bonds directly to the roof decking. Standard underlayment is mechanically fastened with staples or cap nails — leaving the spaces between fasteners as potential water entry points when water is under pressure from above. Ice and water shield has no gaps — it is bonded continuously to the deck surface, creating a complete barrier regardless of how much water pressure builds against it.
Self-Sealing Around Fasteners
The rubberized asphalt formulation of ice and water shield self-seals around nails and staples that penetrate it during shingle installation. When a fastener is driven through the membrane, the surrounding material compresses against the fastener shank and creates a watertight seal. Standard underlayment does not do this — nail holes in felt paper or synthetic underlayment remain as open penetrations that allow water entry when water is under sufficient pressure.
These two features combined — full deck adhesion and self-sealing fasteners — make ice and water shield the only underlayment product capable of preventing water infiltration from ice dam backup, which can force water uphill beneath shingles and through underlayment at pressures that defeat all other water management strategies.
Where Ice and Water Shield Is Installed
Ice and water shield is not installed across the entire roof — it is targeted to the specific areas where water infiltration risk is highest:
Eaves
The primary application location. Ice and water shield at the eave prevents ice dam water backup from entering the home. Current building code in Colorado Springs under the 2021 IRC requires ice and water shield at eaves for properties above 7,000 feet elevation, extending from the eave edge to a point 24 inches inside the interior wall line — not just 24 inches from the eave edge. This means the membrane must extend further up the roof slope on homes with significant overhangs.
Valleys
The internal angles where two roof slopes meet are high-volume water runoff zones. Ice and water shield in valleys provides waterproofing protection at this high-stress location regardless of how the valley shingles are installed above it. Colorado’s combination of snowmelt runoff and intense rainfall makes valley ice and water shield particularly valuable.
Around Penetrations
Chimneys, skylights, and other roof penetrations are transition points where water infiltration risk is elevated. Ice and water shield installed around penetrations provides additional waterproofing at these vulnerable locations beyond what flashing alone provides.
Rake Edges
On roofs in high-wind areas, ice and water shield at rake edges prevents wind-driven rain from infiltrating beneath the edge shingles. Less universally required than eave application but a best practice in Colorado’s wind environment.
Low-Slope Areas
Any roof section with a pitch below 4:12 — where water drainage is slower — benefits from ice and water shield coverage to compensate for the increased risk of water infiltration in these lower-slope areas.
Colorado Code Requirements for Ice and Water Shield
Ice and water shield requirements in Colorado vary by jurisdiction and property elevation — and understanding which requirements apply to your specific property is essential for identifying code upgrade items in your insurance estimate:
Colorado Springs — PPRBD / 2021 IRC
Under the 2021 International Residential Code as adopted by the Pikes Peak Regional Building Department:
- Ice and water shield required at eaves for all properties at or above 7,000 feet elevation
- Must extend from the eave edge to a point 24 inches inside the interior wall line
- Required in valleys on all roofs regardless of elevation
- Also required around all skylights and roof penetrations in applicable situations
- Standard underlayment used in other areas — ice and water shield is targeted to the specified vulnerable locations
Pueblo — PRBD / 2009 IBC
The Pueblo Regional Building Department follows the 2009 International Building Code. Ice and water shield requirements under this older code version may differ from Colorado Springs — verify current requirements directly with PRBD at prbd.com or 719-543-0002 before assuming the 2021 IRC standard applies.
Below 7,000 Feet
Properties below 7,000 feet elevation in Colorado Springs are not code-required to install ice and water shield at eaves under the current PPRBD standard — but ice dams can still form at these elevations during significant snow events. Ice and water shield is best practice at eaves regardless of elevation in Colorado’s climate, even when not code-required. When not code-required, it does not qualify as a code upgrade item — but it is a quality standard worth discussing with your contractor.
Why Ice and Water Shield Is Consistently Missed in Insurance Estimates
Ice and water shield is one of the most consistently omitted or underscoped items in initial Colorado roof insurance estimates — for several specific reasons:
- Older homes lacked it — ice and water shield was not widely used or required before the 1990s. When an adjuster notes the existing roof did not have ice and water shield, they sometimes omit it from the replacement estimate without recognizing the code requirement for the new installation.
- Elevation not verified — adjusters generating estimates remotely may not verify whether the property’s elevation triggers the code requirement. A desk adjuster using satellite data may not know the property is above 7,000 feet.
- Underlayment combined — some estimates combine all underlayment into a single line item that prices the entire area at standard underlayment rates, understating the cost of the ice and water shield sections at eaves and valleys.
- Coverage area understated — even when ice and water shield is included, the coverage area may be understated — using a generic 24-inch-from-eave calculation rather than the correct 24-inches-inside-the-wall calculation that extends further up the slope on overhanging roofs.
Ice and Water Shield in the Insurance Estimate
In a Xactimate estimate, ice and water shield should appear as a separate line item — not combined with standard underlayment — measured in squares or square feet reflecting the correct coverage areas. A complete estimate includes:
- Eave ice and water shield — calculated to extend from the eave edge to 24 inches inside the interior wall line, reflecting actual overhang depth
- Valley ice and water shield — calculated based on the linear footage and width of all valley areas
- Penetration ice and water shield — around chimneys, skylights, and other penetrations where required
- Standard underlayment — for the remaining roof area not covered by ice and water shield
If your estimate shows only a single underlayment line item covering the full roof area at standard underlayment pricing, it has likely omitted or underpriced the ice and water shield requirement. Submit a supplement identifying the correct ice and water shield coverage areas and their required installation.
Ice and Water Shield and the Code Upgrade Argument
When ice and water shield is required by code and was absent from the prior installation, its addition during a permitted replacement is a code-mandated upgrade covered under your policy’s ordinance and law provision. The argument to the carrier is straightforward:
- The prior installation did not include ice and water shield
- Current code requires ice and water shield at eaves and valleys on this property
- The permitted replacement must meet current code standards
- The cost of the required ice and water shield is therefore a code upgrade item under the ordinance and law provision
This is one of the most defensible code upgrade arguments available on older Colorado homes — the requirement is specific, the code citation is clear, and the prior installation’s deficiency is documentable.
Common Ice and Water Shield Questions
My estimate includes ice and water shield but only at the eaves. Should it also be in the valleys?
Yes — ice and water shield in valleys is standard practice and is required by the IRC regardless of elevation. A valley-only omission is a supplement item worth pursuing. Measure the valley area — typically a strip extending 18 to 36 inches on each side of the valley centerline, depending on the installation method — and submit a supplement for the missing coverage.
How do I know if my current roof has ice and water shield?
The most reliable way is to check from the attic — if ice and water shield was installed at the eaves, you may be able to see the rubberized black membrane along the eave edge where the decking meets the overhang. Your contractor can also identify it during their inspection by examining the edge of the roof at the eave or by pulling back a starter strip tab to see what underlayment is below. If the underlayment at the eave is smooth and black rather than the gray or silver color of standard underlayment, ice and water shield is likely present.
Is ice and water shield more expensive than standard underlayment?
Yes — significantly. Ice and water shield costs three to five times more per square than standard synthetic underlayment. This price difference is why it matters whether your estimate correctly specifies ice and water shield at eaves and valleys rather than applying standard underlayment pricing across the entire roof. The cost difference on a typical Colorado home can range from several hundred to over a thousand dollars depending on eave and valley lengths.
My property is below 7,000 feet. Can I still request ice and water shield in my replacement?
Yes — you can always request that your contractor install ice and water shield at eaves and valleys as a quality upgrade even when not code-required. However, when below the elevation threshold, ice and water shield at eaves does not qualify as a code upgrade item — it is an optional improvement. The insurance estimate would cover standard underlayment at the code-required level, and you would pay the cost difference for the upgrade. Given the protection it provides in Colorado’s climate, it is a worthwhile investment even when not required.
How Claim Advocacy Helps With Ice and Water Shield Claims
Ice and water shield is consistently underrepresented in Colorado roof insurance estimates — either omitted entirely, underscoped in coverage area, or incorrectly priced at standard underlayment rates.
- Elevation verification — confirming whether the property’s elevation triggers the ice and water shield code requirement under the applicable jurisdiction’s adopted code
- Coverage area calculation — calculating the correct eave coverage area using the 24-inches-inside-the-wall standard rather than a generic from-eave measurement
- Existing installation assessment — determining whether ice and water shield is present in the current installation and documenting its absence for the code upgrade argument
- Valley coverage verification — confirming that valley ice and water shield is included as a separate line item at correct dimensions
- Code upgrade documentation — citing the specific PPRBD or PRBD code provision requiring ice and water shield and presenting it in a format the carrier can review and approve
- Pricing verification — confirming that ice and water shield line items are priced at the correct material rate rather than at standard underlayment pricing
Related Glossary Terms
- Ice Dam
- Eave
- Valley
- Underlayment
- Code Upgrade Coverage
- Law and Ordinance Coverage
- Pikes Peak Regional Building Department (PPRBD)
- IRC (International Residential Code) — Colorado Adoption
- Supplemental Claim
- Scope of Loss
Ice and Water Shield Missing From Your Estimate?
Ice and water shield at eaves and valleys is one of the most consistently underscoped items in Colorado roof insurance estimates — and one of the most important components for long-term waterproofing performance in Colorado’s climate. A free inspection confirms your property’s elevation, your current installation’s ice and water shield status, and what your replacement estimate should include before you accept a settlement that may be leaving this critical component out.
📞 Call to discuss your claim: (719) 210-8699
📧 Email: gerald@winik.io