Roof underlayment family

GMC Roof Underlayments

Review 3 GMC Roofing & Building Paper Products underlayment references by attachment, material type, roof-covering fit and published performance role.

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GMC ASTM D226 Type I asphalt-saturated felt product roll from the official brochure

Roof underlayment family

Compare GMC underlayments by application.

This page groups 3 underlayment products from GMC Roofing & Building Paper Products into one focused manufacturer resource. It keeps exact product names, attachment methods and roof-covering roles together.

The options below identify whether the product is self-adhered or mechanically attached, the material construction, intended roof-covering fit and key published features.

Current family references

Compare 3 underlayment references.

Every option below keeps its image, name and comparison facts together. Use those references to narrow the direction, then connect the selection to the property and estimate.

GMC Roofing & Building Paper Products

ASTM D226 Type I

Asphalt-saturated felt · Mechanically attached

A traditional ASTM D226 Type I asphalt-saturated organic felt for compatible steep-slope roof assemblies.

Product / system role: Asphalt-saturated felt
Material / component: Traditional asphalt-saturated organic felt
Attachment: Mechanically attached
Roof fit: Compatible steep-slope coverings
Technical reference: Lapped and mechanically fastened · Type I product; exposure and fastening limits apply
Substrate / format: Compatible roof deck · Product data sheet controls

ASTM D226 Type I
Traditional felt
Mechanically attached

GMC Roofing & Building Paper Products

ASTM D226 Type II

Asphalt-saturated felt · Mechanically attached

A heavier ASTM D226 Type II asphalt-saturated organic felt for compatible steep-slope roof assemblies.

Product / system role: Asphalt-saturated felt
Material / component: Traditional asphalt-saturated organic felt
Attachment: Mechanically attached
Roof fit: Compatible steep-slope coverings
Technical reference: Lapped and mechanically fastened · Type II product; exposure and fastening limits apply
Substrate / format: Compatible roof deck · Product data sheet controls

ASTM D226 Type II
Traditional felt
Mechanically attached

GMC Roofing & Building Paper Products

ASTM D4869 Type II

Asphalt-saturated felt · Mechanically attached

An ASTM D4869 Type II asphalt-saturated roofing felt for compatible steep-slope roof-covering assemblies.

Product / system role: Asphalt-saturated felt
Material / component: Traditional asphalt-saturated roofing felt
Attachment: Mechanically attached
Roof fit: Compatible steep-slope coverings
Technical reference: Lapped and mechanically fastened · Type II product; covering and exposure requirements apply
Substrate / format: Compatible roof deck · Published 39 3/8 in roll

ASTM D4869 Type II
Traditional felt
Mechanically attached

From product reference to roofing scope

Choose underlayment as part of the complete roof.

Underlayment sits below the visible roof covering, so its role is easy to overlook. Temperature exposure, deck condition, fastening, dry-in timing, penetrations and the covering system all affect the decision.

Use this manufacturer library to compare product roles. America Roofing can then match the underlayment to the roof covering and define the complete assembly in the estimate.

Product-family questions

GMC Roof Underlayments FAQs

Straight answers about using the product references during estimate planning.

What is included on the GMC Roof Underlayments page?

This page brings together 3 underlayment references with visible manufacturer names, images, descriptions and comparison facts. It is organized at the family or system level so related options can be reviewed together.

Can America Roofing use an option shown for GMC Roof Underlayments?

The page is a product and system reference rather than a stock promise. America Roofing evaluates the property, roof condition and project scope before confirming the practical option for an estimate.

Does selecting GMC Roof Underlayments determine the complete roof?

No. The visible product or named system is one decision. Deck condition, underlayment or insulation, attachment, flashing, drainage, ventilation and project-specific details still shape the completed roofing scope.

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Get a clear answer about your roof.

Tell us what you are seeing. We will inspect the roof, explain the options, and give you a practical next step—without the canned sales pitch.

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