Why New Roof Shingles Are Not Laying Flat and How to Fix It

New roof shingles that refuse to lay flat cause aesthetic concerns and can lead to leaks and premature failure. This article explains the common causes, inspection steps, temporary fixes, and professional remedies to restore a smooth, weather-tight roof. Understanding the root causes and timely action helps avoid larger repairs and warranties being voided.

Common Cause	Quick Fix	Long-Term Remedy
Poor Installation	Re-nail or lift and reseat	Partial or full re-roof by a licensed roofer
Improper Storage	Allow shingles to relax	Replace warped bundles
Roof Deck Issues	Tack down loose deck	Replace rotten or warped decking
Heat/Cold Movement	Monitor; secure edges	Use appropriate underlayment and fasteners

Common Causes Of Shingles Not Laying Flat

Several factors can prevent new shingles from lying flat, including installation errors, improper storage, roof deck problems, and material defects. Each cause has distinct signs and remedies, so accurate diagnosis is essential before repair work begins.

Installation Errors And Fastening Problems

Incorrect nailing location, insufficient or over-driven nails, and wrong nail type are among the most frequent installation mistakes that lead to shingles buckling, tenting, or curling. Manufacturer nailing patterns must be followed to allow shingle sealing strips and tabs to function properly.

Common installation-related signs include shingles that are loose at the top but nailed down at the bottom, raised tabs over nail lines, and uneven alignment of shingle courses. These indicate nailing outside the manufacturer’s prescribed nailing zone or missed nails.

Improper Shingle Storage And Handling

Shingles stored in direct sun, on uneven surfaces, or exposed to moisture can warp, curl, or become brittle before installation. Hot temperatures can cause shingles to stick together in the bundle and then lift after being spread across a roof.

When shingles are stacked on a roof for too long before installation, they may adopt the roof’s slope or become deformed. Always store bundles flat in a shaded, dry area and install soon after delivery.

Roof Deck And Structural Issues

A warped, uneven, or deteriorated roof deck prevents shingles from seating properly.Signs include localized bulges, soft spots underfoot, or visible gaps between decking boards. Shingles laid over an unstable deck will follow the irregularities, producing waves or dips.

Substrate issues can arise from plywood or OSB swelling due to moisture, joist sagging, or previous repairs that altered deck flatness. Inspection and deck repair are often required prior to shingle replacement.

Environmental And Weather-Related Factors

Temperature extremes and humidity affect shingle flexibility and sealant activation.Cold shingles are stiff and resist laying flat; warm shingles are pliable and may flatten but also risk adhesive stickiness that prevents proper alignment if not handled correctly.

After installation, curing time for thermal sealing strips varies with temperature. Low temperatures can delay sealant bonding, leaving shingles temporarily unsealed and susceptible to wind uplift.

Shingle Quality, Design, And Manufacturing Defects

Low-quality shingles or certain architectural designs may be more prone to lifting or buckling.Defective batches can have inconsistent thickness or adhesion strips with poor performance. Some designer or heavy laminated shingles require precise alignment and manufacturer-recommended fasteners to lie flat.

Always verify product specifications and buy shingles from reputable manufacturers. Check for visible defects before installation and retain samples for warranty claims.

Inspection Checklist: How To Diagnose The Problem

A systematic inspection helps determine whether the issue is installation, substrate, materials, or environment-related.Key steps include checking nail placement, counting missed fasteners, testing for soft spots in decking, and reviewing storage and installation records.

• Visual Alignment Check: Look for straight courses, consistent exposure, and gaps between shingles.
• Nail Pattern Verification: Inspect several shingles to confirm nails are in the correct nailing zone and are neither over-driven nor under-driven.
• Deck Examination: Probe for soft or spongy areas and inspect attic from below for deck sagging or daylight.
• Material Review: Compare bundles on site for warping and check manufacturer lot numbers for recalls.

DIY Fixes And Temporary Measures

Small areas where shingles are not laying flat can sometimes be remedied without full re-roofing.Temporary fixes should be conservative and aimed at preventing water infiltration until permanent repairs are scheduled.

• Re-nailing Loose Shingles: Use the correct roofing nails at the recommended location and depth; avoid over-driving.
• Use Roofing Cement: Apply a small amount of manufacturer-approved roofing cement under lifted tabs and press firmly to adhere; this is best for localized lifting.
• Weighted Flattening: For minor warps caused by storage, cold-weather stiffness can be improved by allowing shingles to warm before flattening and installing.

When Professional Repair Or Replacement Is Necessary

Large areas of buckling, extensive deck issues, or improper original installation usually require professional intervention.Licensed roofers will remove affected shingles, correct the deck, install proper underlayment, and reinstall or replace shingles following manufacturer instructions.

Documentation and photos are important for warranty work. Manufacturers often require certified roofers or specific repair procedures for warranty compliance.Discuss options and get written estimates before repair authorization.

Cost Considerations And Warranty Impacts

Repair costs vary widely depending on the cause and scope of work, ranging from minor re-nailing and cementing ($100–$500) to partial re-roofing ($1,000–$5,000) or full replacement ($5,000–$15,000+ for typical U.S. homes).

Improper repairs or DIY fixes that contradict manufacturer guidelines can void warranties. Always consult the shingle manufacturer’s installation instructions and retain proof of proper procedures when hiring contractors.

Prevention And Best Installation Practices

Prevention begins with correct material handling, storage, and professional installation.Follow these best practices to help ensure shingles lay flat and perform as expected.

• Store Bundles Properly: Keep shingles flat, shaded, and dry until installation.
• Install At Appropriate Temperatures: Avoid nailing very cold shingles; follow manufacturer temperature guidelines.
• Use Proper Fasteners And Nailing Patterns: Use corrosion-resistant roofing nails at correct length and location.
• Inspect And Repair Decking First: Ensure the roof deck is flat, dry, and structurally sound before shingle installation.
• Follow Manufacturer Instructions: Adhere to recommended underlayment, starter strips, and sealant practices.

Choosing A Qualified Roofer And Verifying Work

Select a licensed, insured roofer with local references and manufacturer certificationsto reduce the chance of improper installation. Request a written scope, timelines, warranty details, and a materials list before work begins.

After completion, conduct a thorough walkthrough and take photos of the finished roof. Ask for maintenance tips and ensure a clear process for handling follow-up issues or warranty claims.

Frequently Asked Questions About New Shingles Not Laying Flat

Why Do Shingles Curl Shortly After Installation? Curling can be due to rapid temperature changes, weak sealant activation, or nail placement errors. Immediate evaluation is recommended to prevent water intrusion.

Can Raised Shingle Tabs Be Repaired? Small raised tabs can often be secured with roofing cement or re-nailing if the deck is sound and the shingles are undamaged. Large areas may need replacement.

How Long Should New Shingles Take To Lay Flat? Properly installed shingles typically settle and seal within a few days to a few weeks depending on temperature. Persistent lifting beyond this period indicates a problem requiring inspection.

Resources And Manufacturer Guidance

Consult shingle manufacturer installation manuals and the Asphalt Roofing Manufacturers Association (ARMA)for technical specifications and best practices. These resources guide proper nailing patterns, temperature ranges, and warranty requirements.

Keep product receipts, lot numbers, and photos from the day of installation. These records expedite warranty evaluation and contractor accountability if defects appear.