Roofing Contractor Red Flags: 15 Warning Signs Before You Sign
Roofing has the highest scam rate of any home improvement category. Here are the flags — from storm chasers to missing underlayment — that separate legitimate roofers from problems.
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BidLens checks all 15 flags automatically — shingle brand, underlayment, ice shield, payment terms, storm chaser patterns.
Analyze my roofing bid free →1. Storm chaser / unsolicited door-knock
Contractor showed up after a storm without being called. Storm chasers flood neighborhoods after hail or wind, do quick work with cheap materials, and are gone before problems surface.
Do not engage. Call a local roofer you find independently.
2. Offering to cover your deductible
Waiving or absorbing your insurance deductible is insurance fraud in all 50 states — a felony. Contractors who offer this are inflating the claim to cover their discount. You can face legal exposure.
Walk away immediately. Report to your state insurance commissioner if you wish.
3. Wanting to handle your entire insurance claim
Your insurance relationship is yours. A contractor who insists on managing your claim, speaking to your adjuster directly, or having checks made out to them is a red flag for fraud and claim inflation.
You manage your own claim. Contractor provides documentation; you submit it.
4. Full payment before work begins
Standard payment: deposit + materials delivery payment + completion payment. A roofer demanding full payment before a shingle is installed has no incentive to finish correctly or honor warranty claims.
Refuse. Maximum acceptable upfront: 15–20% deposit plus materials payment on delivery.
5. No underlayment or ice shield specified
Underlayment is code-required (IRC R905.1.1). Ice and water shield is required at eaves and valleys in cold-climate states (IRC R905.1.2). Both are invisible once the roof is done — the most common quality skip.
Add to scope in writing: "Synthetic underlayment over full deck. Ice and water shield at eaves (minimum 24" inside wall line), valleys, and all penetrations."
6. Shingle brand and product line not specified
"Architectural shingles" spans GAF Timberline HDZ (best-in-class) to generic big-box brands with no labor warranty. The difference is 30-year vs. 20-year performance and whether you qualify for enhanced warranty programs.
Require: exact manufacturer, product line, and color in writing. GAF Timberline HDZ, CertainTeed Landmark, or Owens Corning Duration are the Big 3 standards.
7. No drip edge mentioned
Drip edge is code-required (IRC R905.2.8.5) and costs $1–3/LF. Without it, water runs behind fascia causing rot. Contractors skip it to sharpen bids. Takes 30 minutes to install.
Add to scope: "Install new metal drip edge at all eaves and rakes per IRC R905.2.8.5."
8. Roofing over existing without deck inspection
Installing over existing shingles saves $1–3/sqft but hides rotted decking, damaged flashing, and prior installation defects. Also adds weight and shortens new roof life 20–40%. Max two layers allowed by code (IRC R905.2.2).
Ask: "Are you tearing off and inspecting the deck?" Tear-off is almost always worth it.
9. Reusing existing flashing
90% of roof leaks happen at flashing points. Old flashing has seal failures, rust, and movement gaps. A new roof with old flashing at chimneys, walls, and valleys will leak within years.
Specify: "All flashing to be replaced — chimneys, valleys, pipe boots, wall intersections."
10. No ventilation addressed
Inadequate attic ventilation voids most shingle warranties (GAF, OC, CertainTeed all require balanced intake/exhaust). Roof replacement is the cheapest time to fix this. Improper ventilation shortens shingle life up to 50%.
Ask: "Are you checking ventilation balance and adding ridge vent if needed?"
11. No mention of decking replacement rate
30% of roofs have rotted decking discovered during tear-off. If not pre-priced, the change order hits when old roof is off and you have zero leverage.
Get the per-sheet price for decking replacement in writing before signing: "Decking replacement: $X per sheet as needed."
12. Contractor not pulling the permit
Most jurisdictions require permits for full reroof. Unpermitted roofing can void homeowner's insurance and cause issues at home sale. Contractor should pull all permits.
Ask: "Are you pulling the permit?" The answer must be yes.
13. No manufacturer certification mentioned
GAF Master Elite, CertainTeed ShingleMaster, and OC Platinum Preferred contractors unlock enhanced warranty programs (10–25 year labor coverage). Only ~2% of roofers qualify for the top tier.
Ask: "What is your certification level with this manufacturer?" Higher certification = better warranty available to you.
14. Cash only payment
No paper trail, no dispute options, no card protection. Legitimate roofing companies accept checks. Cash-only is common among unlicensed operators.
Pay by check or credit card. Always.
15. Timeline of one day for a full reroof
A full reroof on a 2,000 sqft home typically takes 1–2 days for a full crew. One-day timelines for large or complex roofs can mean rushing flashing work and nail gun calibration.
Ask: "How many crew members and what is the realistic timeline?" Quality work on complex roofs takes time.
BidLens checks all 15 roofing flags automatically
Upload your roofing bid and BidLens checks shingle brand, underlayment, ice shield, payment terms, flashing, ventilation, and storm chaser patterns in 60 seconds.
Analyze my roofing bid free →Frequently Asked Questions
What are the biggest red flags in a roofing bid?+
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