New Roof Installation
Roof Replacement in Long Island & New Jersey
When repairs no longer make sense, a properly installed new roof protects your property for decades. Quality materials, clean installation, and a clear written estimate.
When It’s Time for a New Roof
A roof replacement done properly
A new roof is one of the biggest improvements you’ll make to your property — and the installation matters as much as the materials.
Mariani Roofing replaces residential and commercial roofs across the Tri-State area. We remove the old roofing, inspect and prepare the deck, install proper underlayment and flashing, and finish with a clean, watertight roof system. You get a straight recommendation on materials and a written estimate before any work starts.
- Full tear-off and deck inspection
- Proper underlayment, flashing & ventilation
- Architectural & asphalt shingle roofing
- Flat & low-slope roof systems
Repair or Replace?
Signs it’s time to replace your roof
- The roof is at or past its expected lifespan
- Multiple leaks in different areas
- Widespread curling, cracking, or bald shingles
- Sagging roof deck or rotted sheathing
- Repeated repairs that no longer hold
- Major storm damage across the roof
- Granules filling the gutters
- You’re selling and the roof is a known issue
Not sure which way to go? A roof inspection gives you a clear answer. If a repair will do, we’ll say so.
Cost Factors
What affects roof replacement cost
We don’t quote prices without seeing the roof — but these are the factors that shape the estimate:
Roof Size & Slope
Larger and steeper roofs take more material and labor.
Material Choice
Asphalt, architectural shingle, or flat-roof membrane.
Tear-Off & Layers
Removing existing layers and any deck repairs needed.
Access & Details
Chimneys, skylights, valleys, and roof access.
Roof Replacement FAQ
New roof questions
How long does a roof replacement take?
Many residential roofs are completed in a few days, depending on size, weather, and complexity. We’ll give you a realistic timeline with your estimate.
How long will a new asphalt shingle roof last?
With quality materials and proper installation, asphalt shingle roofs commonly last 20–30 years. Ventilation and maintenance affect the real-world lifespan. More on shingle roofing →
Do you replace flat and commercial roofs?
Yes — see flat roofing and commercial roofing for low-slope membrane systems.
Will you give me a written estimate?
Always. After inspecting the roof, you get a free written estimate covering scope, materials, and price — before any work begins.
Ready for a new roof?
Call Mariani Roofing for a free roof replacement estimate across Long Island, NYC, and New Jersey.