Flat & Low-Slope Roofing
Flat Roofing in Staten Island, NY
Flat and low-slope roofs require a different roofing system than traditional asphalt shingles. NYC Roof Co helps property owners understand the roof’s slope, drainage, existing assembly, and available roofing-system options before selecting a replacement or repair approach.
Why it differs
Flat Roofing Is a Different System
A low-slope roof should not simply be treated like a steep-slope shingle roof with less pitch. Water moves slowly across it, so the assembly and the details around it are what keep the building dry. The right approach depends on the specific property rather than a general rule.
- 01
Roof pitch
How much slope the roof actually has influences which roofing systems are appropriate and how water leaves the surface.
- 02
Drainage
Where water goes — and where it lingers — shapes both the assembly and the details around it.
- 03
Seams
Low-slope systems rely on seams and laps rather than the overlapping courses used on shingle roofs.
- 04
Penetrations
Vents, pipes, curbs and equipment supports each need their own detail on a low-slope roof.
- 05
Perimeter conditions
Edges, parapets and terminations determine how the system is secured and closed off.
- 06
Flashing
Wall transitions and adjoining surfaces are handled differently than on a steep-slope roof.
- 07
Existing roof layers
What is already on the deck affects whether a system can go over it or should be removed.
- 08
Insulation
Insulation and cover board may form part of the assembly rather than sitting only below the deck.
- 09
Roof deck condition
The deck underneath carries everything above it, and its condition is confirmed on the property.
Options
Flat Roofing System Options
These are the low-slope systems most often discussed for Staten Island properties. Which one fits is a question answered by the roof itself.
Modified Bitumen
A multi-layer, asphalt-based roofing system commonly considered for low-slope applications. The assembly is built up from base and cap layers rather than a single sheet.
TPO
A single-ply membrane roofing option used on many low-slope roofs. The membrane is installed in sheets, with seams and details completed as part of the system.
EPDM
Another single-ply membrane roofing option used for low-slope applications, with its own set of seam, flashing and termination details.
Help Me Choose
The appropriate roofing system depends on the existing roof, slope, drainage, penetrations, transitions and other site conditions. No single system is right for every property.
On the roof
What We Evaluate on a Flat Roof
Low-slope roofs tend to fail at details rather than across the whole field, so an evaluation looks at how the system is terminated, drained and penetrated as much as at the membrane itself.
These are examples of conditions that may be evaluated on a given property — not a diagnosis of any particular roof, and not a complete list.
- Ponding or drainage concerns
- Seams and laps
- Roof penetrations
- Perimeter edges
- Flashing and wall transitions
- Drains and scuppers where present
- Membrane deterioration
- Existing layers
- Deck condition
Deciding the path
Repair or Replace a Flat Roof?
When repair may be appropriate
A problem confined to a defined area — a section of membrane, one flashing detail, a penetration or an open seam — can sometimes be repaired while the rest of the system continues to perform.
When replacement is worth evaluating
More widespread deterioration, failures showing up at several details at once, or conditions found in the layers beneath the membrane may justify evaluating a replacement instead of continued repairs.
Age alone does not settle this — the condition of the actual roof does. Learn About Roof Repair.
Property analysis
Start With the Roof Geometry
Starting from your address, the NYC Roof Co property-analysis system uses available aerial and property information to describe the roof you actually have.
Aerial data does not reveal all membrane conditions, drainage details, insulation conditions, deck damage or existing assembly layers. Physical verification may be required before a system is selected.
- 01
Approximate roof surface area
An estimate of the roof area detected on the property.
- 02
Roof pitch
The primary slope, which helps identify low-slope areas.
- 03
Roof segments
How many distinct roof planes the property appears to have.
- 04
Low-slope geometry
Where flatter sections sit relative to the rest of the roof.
The assembly
What Goes Into a Low-Slope Roofing System
Depending on the assembly selected, a low-slope project may involve materials such as those listed here. The actual scope, quantities and products are determined per property once the system and existing conditions are established.
Quantities and pricing are not shown here.
- Field membrane
- Base or cap sheets where applicable
- Insulation
- Cover board
- Adhesives or primers
- Fasteners and plates
- Flashing membrane
- Perimeter edge materials
- Termination components
- Sealants
- Drainage and penetration accessories
Service area
Flat Roofing Across Staten Island
We evaluate flat and low-slope roofs in Great Kills, Tottenville, Eltingville, New Dorp, Todt Hill, Dongan Hills, Annadale, Huguenot, and communities throughout Staten Island.
- Great Kills
- Tottenville
- Eltingville
- New Dorp
- Todt Hill
- Dongan Hills
- Annadale
- Huguenot
Common Questions
Flat Roofing Questions
Answers to what Staten Island property owners most often ask about flat and low-slope roofing.
Get started
Start With Your Flat Roof
Enter your Staten Island property address to begin a preliminary roof analysis and better understand the size and geometry of your low-slope roofing project.