Commercial Roof Repair in Unionville, PA

Commercial roof repair means finding and fixing leaks and wear on business, institutional and farm buildings, most often on low-slope membrane or metal roofs. The work centers on seams, flashing at walls and rooftop equipment, drains and scuppers, and on regular inspections, which the National Roofing Contractors Association recommends at least twice a year.

Commercial buildings we work on

Southern Chester County's commercial buildings are mostly small and varied. We focus on the kinds of buildings common around Unionville, Kennett Square and West Chester:

• Offices and professional buildings, including medical and dental practices
• Retail shops and restaurants on main streets and in small strip centers
• Churches, meeting houses and community halls, often with steep slate or shingle roofs and low-slope additions
• Mixed-use buildings with apartments over storefronts
• Farm businesses, equestrian facilities, nurseries and agricultural buildings
• Small warehouses, workshops and flex buildings
• Apartment buildings and multi-unit properties

Large industrial roofs need specialized commercial crews and equipment. If your building is outside what we do well, we will tell you.

Where commercial roof leaks start

Rooftop equipment

Heating and cooling units sit on curbs that must be flashed into the roof. Service technicians walk across the membrane, drop screws and cut panels, and many commercial leaks start within a few feet of equipment. Units without a cricket on their uphill side dam water against the curb.

Drains and scuppers

Interior drains, scuppers and gutters carry all the water off a low-slope roof. Leaves from mature trees, gravel and debris block them. A loose drain clamping ring lets water run down the outside of the drain pipe into the building.

Walls and parapets

Where the roof meets a parapet or a taller wall, the membrane must turn up and be counter flashed or capped. Coping on parapet walls is a frequent leak source: water gets into the top of the wall and shows up on interior walls below.

Seams and field damage

Open seams, punctures from foot traffic and dropped tools, and storm damage from limbs and wind all let water under the membrane, where it can travel a long way before it shows.

Penetrations

Pipes, conduit, exhaust fans, skylights and satellite mounts each need proper flashing. Old pitch pans filled with sealant shrink and crack.

Church and historic institutional roofs

Churches, meeting houses and community halls around southern Chester County often combine a steep slate or shingle main roof, a tower or steeple, and newer low-slope additions for offices, kitchens or classrooms. Each part fails differently.

• Steep slate roofs need slate-specific repair: matched slates, hooks or copper bibs, and copper flashing. Most leaks come from flashing and slipped slates, not worn-out stone.
• Towers and steeples have complicated flashing where the tower meets the roof, and louvers that can let wind-driven rain into the structure.
• Built-in gutters on older buildings send water into walls when their linings fail.
• Additions often have membrane roofs that meet the old masonry walls, a common leak point.

Congregations and boards usually need to plan repairs over several budget cycles. Our reports separate urgent work from items that can be scheduled, with photos the committee can review.

Commercial roof maintenance and inspection plans

NRCA recommends building owners and facility managers schedule roof maintenance inspections at least twice a year, preferably in spring and fall, with additional inspections after severe weather such as hailstorms or high winds (Professional Roofing, NRCA). That schedule fits Chester County well: spring catches winter damage, and fall clears leaves and prepares drains before freezing weather.

What a maintenance visit covers

• Clearing drains, scuppers, gutters and downspouts
• Checking seams, field membrane and any blisters or cracks
• Inspecting flashing at walls, parapets, curbs and penetrations
• Checking for damage around rooftop equipment after service visits
• Noting ponding areas and changes since the last visit
• Small repairs on the spot, with photos
• An updated report and a list of items to plan for

Keeping a running record of inspections also helps with manufacturer warranties, which often require maintenance, and with insurance questions after a storm.

Permits and code for commercial roof work

Pennsylvania's residential reroof exemption does not extend to commercial buildings. Township guidance under the Uniform Construction Code generally requires a building permit for work on commercial structures and multi-family buildings with three or more units. Agricultural buildings used to store farm products or house animals are excluded from the code, but spaces where products are processed or that are open to the public are not.

Before larger repairs or replacement, we confirm requirements with the township for your address. East Marlborough Township's office is at 721 Unionville Road, Kennett Square, PA 19348, 610-444-0725.

What commercial roof repair costs

Commercial roof repair costs depend on roof size, system type, access, equipment and the extent of wet insulation. National 2026 benchmarks for general roof repair run about $400 to $1,900 for a typical repair, $300 to $1,100 for flat roof repairs and $2,000 to $6,000 for major damage (Fixr), but commercial work often falls outside residential ranges.

What drives commercial pricing: roof access and safety requirements, working hours outside business times, equipment that must be disconnected or lifted, the amount of wet insulation, and whether repairs must meet a manufacturer's warranty requirements. We price in writing after inspecting the roof.

Working with facility staff and other trades

Commercial roofs are shared spaces. HVAC technicians, electricians, telecom crews and solar installers all work on them, and each visit can leave behind a cut membrane, a dropped screw or a disturbed flashing. A few habits prevent most of that damage:

• Keep a simple roof access log so you know who was on the roof and when
• Ask other trades to use walk pads and to report any damage they see or cause
• Have the roof checked after major equipment work, such as a unit replacement
• Keep the roof plan from our report with the building records, so every contractor knows where drains and sensitive areas are

When a commercial roof leaks during business hours

1. Protect people first. Close off areas under sagging ceiling tiles or active drips, and keep water away from electrical equipment.
2. Protect equipment and stock. Cover computers, records and inventory with plastic and move what you can.
3. Check the drains if safe. A clogged drain or scupper is a common cause of sudden leaks during heavy rain. Do not go on the roof during a storm.
4. Record it. Photos and notes of where and when water appears help us trace it and help with insurance.
5. Call (610) 817-4457. Tell us the building, roof type if known, and where the water is coming in. We will advise on immediate steps and arrange a temporary repair.

Roof access and safety on commercial buildings

Commercial roofs often have skylights, roof hatches, unprotected edges and equipment that create fall hazards. We plan safe access, protect skylights, and keep work areas controlled. We also ask that rooftop equipment contractors notify you when they have been on the roof, so any damage they cause can be found and fixed quickly.

If your building has a roof hatch or fixed ladder, let us know in advance so we can confirm it is safe to use and plan how materials will reach the roof.