One of the most common questions homeowners ask during a roof replacement is:

“My contractor says they don’t need to remove the old felt paper. Is that okay?”

At first glance, this might sound harmless. After all, felt paper isn’t visible once the roof is finished. But whether old felt should be removed depends on how the roof is being installed, the condition of the existing layers, and whether the contractor is following best practices.

Let’s break this down clearly so you understand what proper roof installation looks like, when old felt must be removed, and when leaving it behind can create serious long-term problems.

What Is Felt Paper — and Why Does It Matter?

Felt paper (also called roofing felt or underlayment) is a protective layer installed between the roof decking and the shingles.

Its role is to:

• Act as a secondary water barrier
• Protect the roof deck from moisture
• Reduce leak risk if shingles are damaged
• Help manage condensation and minor water intrusion

As explained in Does Replacing My Roof Only Mean Replacing the Shingles?, underlayment is a critical system component, not a cosmetic detail.

Proper Roof Installation Is a System — Not Shortcuts

A roof replacement should never be “shingles over old materials.” A professional installation is a system-based process that starts at the deck and builds upward.

A proper roof replacement typically includes:

• Full removal of old shingles
• Removal of old felt and underlayment
• Deck inspection and repairs
• New underlayment installation
• Ice & water barrier where required
• New flashing
• Proper attic ventilation
• New shingles

Skipping steps at the bottom of the system compromises everything above it — a point also covered in How Long Will My Roof Replacement Take?.

Why Some Contractors Don’t Want to Remove Old Felt

There are a few common reasons contractors avoid removing old felt paper:

• To save time
• To reduce labor costs
• To avoid deck repairs
• To speed up production
• To hide underlying issues

While this may benefit the contractor, it rarely benefits the homeowner.

When Old Felt Paper Should Be Removed

In most full roof replacements, removing old felt is the correct and professional approach.

1. To Properly Inspect the Roof Deck

You cannot fully inspect the decking if old felt remains in place.

Hidden issues may include:

• Rotted or soft decking
• Mold or moisture damage
• Old leak paths
• Improper past repairs

Installing a new roof without inspecting the deck is like painting over water damage without fixing the leak — and those hidden issues can later become insurance claim disputes.
https://xyzroofingandrestorations.com/understanding-an-insurance-roof-claim-payout/

2. To Ensure Proper Adhesion of New Underlayment

Modern synthetic underlayments and ice & water shields are designed to bond directly to clean decking, not old felt.

Leaving old felt can:

• Reduce adhesion
• Create uneven surfaces
• Cause wrinkles or voids
• Violate manufacturer installation requirements

This can directly impact warranty eligibility.

3. To Protect Manufacturer Warranties

Most manufacturers require:

• Proper deck preparation
• Approved underlayment systems
• Installation per written specifications

Old felt left in place may:

• Void extended warranties
• Create claim disputes
• Disqualify workmanship coverage

As explained in Can Any Roofing Contractor Offer a 50-Year Warranty?, warranties are tied to installation quality, not just materials.

This is especially important for homeowners expecting long-term or 50-year manufacturer warranties.
https://xyzroofingandrestorations.com/can-any-roofing-contractor-offer-a-50-year-warranty/

4. To Prevent Moisture Trapping

Layering new underlayment over old felt can trap moisture between layers.

This may lead to:

• Deck rot
• Mold growth
• Shortened roof lifespan
• Hidden structural damage

Roofs must manage moisture, not seal it in.

Poor ventilation makes this problem worse. Proper attic airflow plays a major role in preventing trapped moisture and heat buildup.
https://xyzroofingandrestorations.com/ridge-vent-vs-turtle-vent-vs-solar-vent/

When Old Felt Might Be Left in Place (Rare Exceptions)

There are limited scenarios where old felt may remain — but these are exceptions, not best practice.

Possible examples:

• Small partial repairs (not full replacements)
• Old felt that is fully bonded and manufacturer-approved
• Situations specifically allowed by manufacturer guidelines

Even then, the contractor should clearly explain why, document the deck condition, and confirm warranty compliance.

“Allowed” vs. “Best Practice” — Not the Same Thing

Some local codes may allow old felt to remain. But allowed does not mean recommended.

Best practices prioritize:

• Long-term durability
• Warranty protection
• Deck health
• Moisture management
• System performance

Professional contractors build roofs to last decades — not just pass inspection.

Red Flags Homeowners Should Watch For

Be cautious if a contractor:

• Refuses to explain why old felt stays
• Says “it doesn’t matter”
• Says “we always do it this way”
• Avoids discussing deck condition
• Rushes installation without inspection
• Talks only about shingles, not the system

Transparency is a sign of professionalism.

What a Professional Contractor Should Do Instead

A proper roof replacement should include:

• Complete tear-off to the deck
• Removal of old felt
• Full deck inspection
• Replacement of damaged wood
• New underlayment and ice & water shield
• Proper flashing replacement
• Code-compliant ventilation

This is how roofs are built to perform — not just look good.

Why This Matters Long-Term

Leaving old felt may not cause immediate issues, but problems often appear years later:

• Leaks long after installation
• Warranty denials
• Insurance disputes
• Mold or rot discovered during resale
• Premature roof failure

Once shingles are installed, correcting mistakes underneath becomes expensive.

Proper ventilation is especially critical in preventing heat buildup and moisture problems — regardless of shingle type or color.
https://xyzroofingandrestorations.com/do-dark-colored-shingles-make-my-house-hotter/

Questions You Should Ask Your Contractor

If your contractor doesn’t want to remove old felt, ask:

• How will you inspect the decking?
• Does the manufacturer approve this method?
• Will this affect my warranty?
• How do you prevent moisture entrapment?
• Is this a full replacement or a partial repair?

Clear answers protect your investment.

Our Philosophy on Proper Roof Installation

At XYZ Roofing & Restorations, we believe the quality of a roof is defined by what you don’t see, not just what you do.

Our standard approach includes:

• Full tear-off
• Deck inspection
• New underlayment
• Code-compliant installation
• Manufacturer-approved systems

We don’t install new roofs over unknown conditions — because shortcuts today become problems tomorrow.

If you’re planning a roof replacement, you can get an instant roof quote here and see what a full, system-based installation looks like.

Final Thoughts

So, is it a problem if your contractor doesn’t want to remove old felt paper?

In most full roof replacements, yes — it’s a serious concern.

Removing old felt allows for:

• Proper deck inspection
• Better moisture management
• Stronger underlayment performance
• Warranty compliance
• Long-term roof durability

A roof is a long-term investment. It should be installed correctly from the deck up, not layered over uncertainty.

Asking the right questions now can save you from costly repairs later.

If you’re planning a roof replacement and want clarity before work begins, you can also start with a transparent estimate using our Instant Roof Quote Tool:
https://xyzroofingandrestorations.com/instant-roof-quote/