Wind-rated Underlayment
Wind-rated Underlayment | Storm Damage Restoration | Roofing
When hail, high winds, and driving rain batter your roof, the difference between a quick patch-up and a lasting solution starts beneath the shingles. HEP’s wind-rated underlayment forms a rugged, water-shedding barrier that’s engineered to stay put in gusts up to 130 mph, guarding vulnerable decking until final repairs are complete. Its slip-resistant surface helps crews work faster and safer, so your home is dried-in promptly and protected from further leaks or mold.
Because every minute counts after a storm, our certified technicians arrive with this premium underlayment in the truck, ready to wrap your roof in fortress-level defense the same day we inspect. From free damage assessments to insurance coordination and meticulous installation, our team handles the entire storm damage restoration process while you focus on getting life back to normal.
FAQs
What is wind-rated underlayment and why is it important after a storm?
Wind-rated underlayment is a high-strength synthetic or self-adhering membrane installed between the roof deck and the finished shingles or metal panels. Unlike traditional asphalt felt, it is engineered to stay attached to the deck in extreme uplift conditions (often 110–180 mph), sealing around fasteners and keeping water out if the primary roof covering is lost or damaged. After a storm, it acts as a secondary weather barrier, preventing interior leaks, mold growth, and structural rot while permanent repairs are completed.
How does wind-rated underlayment differ from standard roof felt?
Standard #15 or #30 asphalt felt is a paper product saturated with bitumen. It tears relatively easily, absorbs water, and can blow off in high winds. Wind-rated underlayments are typically woven or layered polypropylene or modified bitumen sheets with reinforced scrim. They offer: • 5–10× higher tear and pull-through strength • Factory-applied adhesives or self-seal edges for airtight laps • UV resistance for 90–180 days of exposure • Tested and labeled wind uplift ratings that meet ICC-ES or Miami-Dade approvals. The upgrade adds a modest cost but greatly increases storm resilience and reduces long-term maintenance.
Can wind-rated underlayment be installed over existing shingles after storm damage?
For a permanent restoration, best practice is to remove damaged shingles, inspect the deck, replace any rotten sheathing, and then install the underlayment directly to clean, dry wood. Overlaying a membrane on old shingles can trap moisture, void manufacturer warranties, and fail to meet building codes. A temporary “dry-in” layer can be placed over existing roofing in an emergency, but it should be considered a short-term measure (30–90 days) until a full tear-off and re-roof can be scheduled.
What wind ratings are available and how do I know which one my home needs?
Manufacturers normally list a design wind speed or an uplift pressure (psf) based on ASTM D6381 or TAS 117 testing. Common options are 110 mph, 130 mph, and 180 mph. Your required rating depends on: • Local building code (IBC/IRC) wind map zone • Distance from the coast or open plains • Roof height and pitch (steeper, taller roofs see higher uplift) • Insurance or lender requirements A qualified roofing contractor or engineer can run a wind uplift calculation and recommend the correct product to ensure compliance and maximize insurance discounts.
Will my insurance cover upgrading to a wind-rated underlayment during storm restoration?
Most policies pay to restore the roof to its “pre-loss condition.” If your old roof already had a comparable underlayment, the upgrade is covered automatically. If not, coverage can still be available under: • Building Code Upgrade/Ordinance & Law endorsement—pays for materials required to meet current codes. • Matching/Comparable Material clauses—when the original materials are no longer available. Provide your adjuster with the code citation (e.g., IRC R905.1.1) or local wind zone requirements and a written estimate from your contractor. Out-of-pocket cost for the upgrade is usually small compared to future savings on deductibles and premiums.
How long does installation take and what is the expected lifespan of wind-rated underlayment?
For an average 2,500 sq ft roof, a trained crew can tear off old felt and install a wind-rated synthetic underlayment in one day, allowing the home to stay watertight until shingles arrive. Self-adhered membranes may add a few hours due to primer and roll handling. Once covered by the final roofing, the underlayment is designed to last the entire service life of that roof—typically 25–50 years. If left exposed (e.g., in material delays), most products can endure 3–6 months of UV and weather without degradation, provided seams are taped and fasteners are properly spaced.