A&W Roofing
Licensed Roofing Contractor — Serving Charlotte, NC & Surrounding NC Communities
This article was written by A&W Roofing's field team — HAAG Certified inspectors and CertainTeed ShingleMaster™ certified installers with hands-on experience across Charlotte and 21 NC communities. All cost figures, timelines, and technical guidance reflect real-world conditions in the NC Piedmont region.
Local Roofing Conditions — Charlotte, Mecklenburg County
Annual Rainfall
44 inches
Hail Events/Year
3–5 per year
Avg Summer High
90°F
Soil Type
Cecil clay loam
Why This Matters for Your Roof
Heavy clay soil drains poorly — gutter overflow saturates foundations fast. High UV accelerates granule loss on south/west slopes. Storm season brings frequent hail and straight-line winds.
Storm season: April – September · High (UV Index 9–10 in summer)
Most Charlotte homeowners do not think much about ice dams. After all, this is North Carolina — not Minnesota. But the Charlotte metro sees enough winter freeze-thaw cycles to make ice dams a real and recurring problem, and the damage they cause is far more expensive than most people expect. Water forced under shingles by an ice dam does not stop at the roof deck. It travels into the attic, soaks insulation, stains ceilings, and rots framing — often without any visible sign until the damage is already severe.
The good news is that ice dam damage is almost entirely preventable. The right underlayment — specifically a self-adhering ice and water shield installed at the eaves and in the valleys — creates a watertight barrier that stops water intrusion even when ice forces it under your shingles. At A&W Roofing, we install CertainTeed WinterGuard™ ice and water shield on every full replacement we do. Here is why it matters, and what Charlotte homeowners need to know.
What Is an Ice Dam — and Why Does It Happen in Charlotte?
How an ice dam forms — step by step
- Warm attic air heats the roof deck above the living space
- Snow or frost on the upper roof melts and runs toward the eaves
- Meltwater reaches the cold overhang (no warm attic below) and refreezes
- Ice builds up at the eave, trapping subsequent meltwater behind it
- Pooled water backs up under shingles and penetrates the roof deck
An ice dam forms when heat escaping from a warm attic melts snow or frost on the upper portion of the roof. That meltwater runs down the slope and refreezes when it reaches the cold overhang at the eaves — the part of the roof that extends beyond the exterior wall and has no warm attic beneath it. As the ice builds up, it creates a dam that traps subsequent meltwater behind it. That pooled water has nowhere to go except under the shingles.
Charlotte's climate is actually well-suited to ice dam formation. Unlike northern climates where temperatures stay consistently below freezing for weeks, Charlotte sees frequent cycles of freezing nights followed by above-freezing days. That pattern — freeze, thaw, freeze — is exactly what drives ice dam formation. A single winter storm followed by a cold snap is enough to create conditions where ice dams can form on any home with inadequate attic insulation or ventilation.
The homes most at risk in the Charlotte area are those built before modern energy codes — typically pre-2000 construction — where attic insulation levels and ventilation were not designed to prevent heat loss through the roof deck. Many of these homes have never had ice and water shield installed because it was not standard practice when they were built.
What Ice Dam Damage Looks Like — and What It Costs
Ice dam damage is deceptive. The entry point is at the eaves, but the water travels far before it becomes visible.
Ceiling stains and peeling paint
The most common first sign. Water that has traveled through the roof deck and insulation appears as brown water stains on ceilings, often near exterior walls. Paint peels and bubbles as moisture saturates the drywall.
Wet or compressed attic insulation
Insulation that has been saturated with water loses most of its R-value and can take weeks to dry out — if it dries at all. Wet insulation is also a prime environment for mold growth, which can spread to framing and sheathing.
Rotted roof decking and framing
Prolonged moisture exposure rots OSB decking and dimensional lumber framing. This is the most expensive consequence of ice dam damage — structural repairs that require opening up the roof and replacing structural members.
Damaged shingles at the eaves
Ice expansion under shingles lifts and cracks them, breaking the seal strips and creating permanent gaps. Even after the ice melts, those shingles no longer seal properly and will leak in any heavy rain.
Gutter and fascia damage
The weight of ice dams — which can reach hundreds of pounds on a typical Charlotte home — pulls gutters away from the fascia board and can tear the fascia itself. Gutter replacement is a common secondary cost after an ice dam event.
How Ice and Water Shield Works — and Why It Matters
| Feature | Felt Paper | Ice & Water Shield |
|---|---|---|
| Adheres to deck | No — loose laid | Yes — self-adhering |
| Seals nail holes | No | Yes — self-sealing |
| Resists pooled water | No | Yes — watertight |
| Ice dam protection | None | Full protection at eaves |
| Required by NC code at eaves | No | Yes (new construction) |
Ice and water shield is a self-adhering, rubberized asphalt membrane that bonds directly to the roof deck. Unlike traditional felt paper underlayment, which is simply laid over the deck and held in place by the shingles above it, ice and water shield seals itself to the deck and self-seals around every nail penetration. Water cannot get through it — even when it is pooling under shingles due to an ice dam.
The critical difference between ice and water shield and standard underlayment is the self-sealing nail hole feature. When a nail penetrates felt paper, it creates a small hole that water can enter. When a nail penetrates ice and water shield, the rubberized membrane grips the nail shank and seals the hole. This is what makes it effective against the hydrostatic pressure created by pooled water behind an ice dam.
Building codes in North Carolina require ice and water shield at the eaves on new construction, but the requirement only covers the first few feet of the roof. At A&W Roofing, we install WinterGuard™ at the eaves, in all valleys, and around all penetrations — the areas most vulnerable to ice dam water intrusion. On homes in particularly exposed locations or with low-slope sections, we extend coverage further up the slope.
CertainTeed WinterGuard™ — What We Install on Every Replacement
A&W Roofing installs CertainTeed WinterGuard™ ice and water shield as standard on every full roof replacement. Here is what sets it apart from generic ice and water shield products.
Self-sealing rubberized asphalt
WinterGuard's rubberized asphalt compound seals tightly around nails and fasteners, eliminating the leak paths that standard underlayment leaves open.
Granulated surface for traction
The granulated top surface gives installers safe footing on steep slopes and provides a stable base for shingle installation — important for quality workmanship on Charlotte's varied roof pitches.
Rated for temperatures down to -20°F
WinterGuard remains flexible and maintains its seal in extreme cold — well beyond anything Charlotte will ever see, which means it performs reliably through every freeze-thaw cycle the region produces.
Compatible with CertainTeed SureStart PLUS™ warranty
Using WinterGuard as part of a complete CertainTeed roofing system — installed by a ShingleMaster™ certified contractor — is required to qualify for CertainTeed's best warranty coverage. Mixing brands can void warranty eligibility.
Meets or exceeds ASTM D1970 standard
ASTM D1970 is the industry standard for self-adhering polymer-modified bituminous sheet materials used as steep-slope roofing underlayment. WinterGuard meets this standard, which is the benchmark for ice and water shield performance.
Ice Dam Prevention Beyond the Underlayment
Ice and water shield is your last line of defense — but the best approach addresses the root cause of ice dam formation: heat escaping through the roof deck. Here is what we look at on every inspection.
Attic insulation levels
The IRC recommends R-38 to R-60 for attics in the Charlotte climate zone (Zone 4). Many older Charlotte homes have R-19 or less. Improving insulation keeps heat in the living space and off the roof deck — the single most effective ice dam prevention measure.
Attic ventilation
Proper ventilation keeps the attic cold in winter by allowing outside air to flush out any heat that does escape through the insulation. The standard is 1 sq ft of net free ventilation area per 150 sq ft of attic floor. Many Charlotte homes are under-ventilated.
Air sealing at the attic floor
Bypasses — gaps around light fixtures, plumbing penetrations, and attic hatches — allow warm conditioned air to flow directly into the attic. Sealing these bypasses before adding insulation is essential; insulation alone cannot compensate for large air leaks.
Ice and water shield at eaves and valleys
Even with perfect insulation and ventilation, a severe freeze-thaw event can produce some ice dam formation. WinterGuard at the eaves and valleys ensures that any water that does get under the shingles cannot penetrate the roof deck.
Ice Dam FAQs — Charlotte, NC Homeowners
Do Charlotte homes really get ice dams?
Yes. Charlotte's freeze-thaw cycle — cold nights, above-freezing days — is actually more conducive to ice dam formation than consistently cold northern climates. Any home with inadequate attic insulation or ventilation can develop ice dams after a winter storm, and the Charlotte area sees several qualifying weather events most winters.
Does my current roof have ice and water shield?
If your home was built before the mid-2000s or has not had a full roof replacement since then, it likely has felt paper underlayment rather than ice and water shield — or ice and water shield only at the very edge of the eaves if it was installed to minimum code. A free inspection from A&W Roofing will document exactly what underlayment is in place.
Can I add ice and water shield without replacing the whole roof?
No. Ice and water shield is installed under the shingles, bonded directly to the roof deck. Adding it requires removing the existing shingles and underlayment. If your roof is otherwise in good condition, a targeted partial replacement of the eave sections is sometimes possible, but a full replacement is usually more cost-effective once you factor in labor.
How much does ice and water shield add to the cost of a roof replacement?
CertainTeed WinterGuard is included as standard in every A&W Roofing full replacement — it is not an add-on charge. The cost is built into our estimate. Upgrading from felt paper to WinterGuard on a typical Charlotte home adds roughly $400–$800 to material costs, which is a small fraction of the total replacement cost and far less than a single ice dam water damage claim.
What should I do if I already have ice dam damage?
Call A&W Roofing at (704) 925-1333 for a free inspection. Our HAAG Certified inspectors will document the damage, assess whether it is covered by your homeowner's insurance, and give you a written estimate for repairs or replacement. Do not attempt to remove ice dams yourself with a heat gun or ice pick — improper removal causes more shingle damage than the ice dam itself.
Sources, Standards & Credentials
The information in this article is based on A&W Roofing's direct field experience in the NC Piedmont, manufacturer installation guidelines, and industry-standard inspection protocols. We cite the following authoritative sources:
- HAAG Engineering — Roof Inspection Standards
HAAG Engineering is the leading forensic engineering firm for roofing damage assessment. A&W Roofing inspectors are HAAG Certified, using the same methodology as insurance adjusters.
- CertainTeed — ShingleMaster™ Certification
CertainTeed ShingleMaster™ is a manufacturer-issued credential recognizing contractors who meet installation quality standards and carry enhanced warranty eligibility.
- Better Business Bureau — A&W Roofing Profile
A&W Roofing holds an A+ rating with the Better Business Bureau, reflecting a track record of resolved complaints and ethical business practices.
- NC Licensing Board for General Contractors
A&W Roofing is licensed and insured in North Carolina. NC roofing contractors are regulated by the NC Licensing Board for General Contractors.
Free Roof Inspection — Charlotte & Surrounding NC Cities
If your home has not had a professional inspection since its last roof replacement, now is the right time — especially before winter. Our HAAG Certified inspectors will assess your underlayment, ventilation, and overall roof condition.
- Free inspection & written estimate — no obligation
- CertainTeed WinterGuard™ standard on every replacement
- CertainTeed ShingleMaster™ certified installer
- 10-year workmanship warranty on full replacements
- HAAG Certified for storm & ice damage documentation