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Roof Underlayment Installation in Ottawa

Secondary moisture barrier protection for your roof system. Quality underlayment extends roof life and prevents interior water damage.

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/ About Underlayment

What is Roof Underlayment?

Underlayment is a secondary moisture barrier installed between your roof deck and shingles. It's your critical backup if shingles leak.

Why Underlayment Matters

Shingles won't last forever. Eventually, after 15-25 years, they deteriorate and leak. Without quality underlayment, water goes directly into your attic, causing wood rot, mold, and structural damage. Proper underlayment catches this water and directs it down and away.

Lifespan

  • Typical lifespan: 20-50 years (varies by type and climate)
  • Should be replaced when re-roofing
  • Deteriorates if exposed to sun over long periods
  • Critical in Ottawa's freeze-thaw climate
Underlayment Layer Cross-Section Diagram
/ Underlayment Options

Underlayment Types

Different underlayment options provide varying levels of protection and durability.

Asphalt-Saturated Felt (Not Recommended)

  • Traditional tar paper material
  • Affordable but short lifespan
  • Deteriorates quickly in Ottawa climate
  • Not recommended for new installations

Synthetic Underlayment (Recommended)

  • Modern polypropylene/polyester material
  • Superior durability (20-50 years)
  • Better moisture resistance
  • Won't rot or deteriorate quickly
  • Works well in Ottawa's harsh climate
  • More expensive but worth the investment

Premium Synthetic Underlayment

  • Enhanced features and performance
  • Superior water shedding properties
  • Better traction for installers
  • Excellent warranty coverage
  • Ideal for challenging installations
/ Benefits

Benefits of Quality Underlayment

Protection & Peace of Mind

  • Secondary barrier catches water if shingles fail
  • Prevents water from entering attic immediately
  • Extends time before emergency repairs needed
  • Reduces likelihood of interior damage

Durability & Longevity

  • Protects roof deck from moisture damage
  • Extends overall roof system lifespan
  • Reduces decay and structural issues
  • Works with other components for integrated protection

Climate Adaptation

  • Critical for Ottawa's freeze-thaw cycles
  • Synthetic materials handle temperature swings
  • Better performance under snow loads
  • Resists ice dam water penetration
/ Installation

Installation & Application

Proper installation ensures underlayment performs correctly throughout its lifespan.

Installation Process

  • Inspect and clean roof deck thoroughly
  • Install underlayment over entire deck
  • Ensure proper overlap at seams (4-6 inches recommended)
  • Secure with appropriate fasteners
  • Install ice and water shield in vulnerable areas
  • Install shingles over underlayment

Key Installation Points

  • Eaves and valleys require extra attention
  • Proper overlap prevents water from running under seams
  • Must work with flashing at all penetrations
  • In Ottawa, ice and water shield must be continuous at eaves
/ Common Questions

FAQ: Roof Underlayment

Yes. Replace underlayment with new roof. Old underlayment should not be reused.
Not recommended. Synthetic underlayment is superior and not much more expensive.
Water leaking through new shingles, visible deterioration if exposed, water stains in attic—signs underlayment needs replacement.
Premium synthetic underlayment with ice and water shield at eaves. This combination handles Ottawa's freeze-thaw climate well.
Yes, but proper technique is critical. Some synthetic underlayments have reduced traction when wet or cold.

Professional Roof Underlayment Installation

Protect your roof investment with quality underlayment installation. Expert installation ensures your backup moisture barrier works properly. 35 years of experience.

Get Your Free Estimate Call (343) 321-0218
Get Free Estimate (343) 321-0218
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