Before rainy season, a commercial roof needs a review of its covering, seams, flashing, penetrations and drainage, supported by repair records and a clear plan for any defects. Property managers can organize the information and observe accessible interior or ground-level conditions. Roof access, testing and repairs belong with qualified personnel using appropriate safety controls.
This checklist is intended for occupied commercial and industrial properties in Southern California, including offices, warehouses, retail buildings and managed portfolios. Adjust the scope to the roof system, manufacturer's requirements, previous repairs and the way the building operates.
Gather records before scheduling the roof review
Start with the roof type and approximate installation date, if known. Collect warranty documents, previous inspection reports, repair scopes, leak photographs and any information about later coating or equipment work. If a record is missing, identify it as unknown rather than assuming that all roofs on the property share the same system.
Map reported leaks to rooms or building areas. Record when each appeared, how long rain had been falling and whether wind direction or equipment operation seemed relevant. Include recurring stains even when they are dry at the time of the inspection. Water can travel before it becomes visible indoors, so the location of a ceiling stain is a starting point rather than a confirmed entry point.
Arrange roof access and identify restrictions before the visit. Confirm access contacts, escort requirements, tenant hours and any sensitive operations below the work area. Tell the contractor about known fragile surfaces, skylights, equipment hazards or previously reported structural concerns. Do not assume that an unlocked roof hatch makes access safe.
What should a professional commercial roof review cover?
A suitable scope is broader than looking for a hole. GAF's roof maintenance guidance identifies debris, water, clogged drains, loose flashing and wind uplift among the conditions worth reviewing. Ask the contractor to adapt the inspection to the actual system and to explain what cannot be determined visually.
1. Roof covering and previous repairs
Check for visible damage, deterioration, displaced material and areas where prior patches warrant further attention. Record changes around rooftop service paths and equipment work. A recently patched area should be assessed for compatibility and condition rather than assumed to be permanently resolved.
2. Seams and transitions
Review accessible seams and transitions between materials. Ask the contractor to identify separation, deteriorated repairs or other conditions requiring evaluation. The repair method depends on the membrane or assembly; applying a generic sealant is not an appropriate answer to every opening.
3. Flashing and perimeter details
Include parapets, edge conditions and the transitions between roof and vertical surfaces. Note visible movement or deteriorated components. Wind-driven rain can expose weaknesses that are less apparent during a brief shower, but a visual finding alone does not prove the cause of every leak.
4. Penetrations and equipment curbs
Review details around pipes, conduits, HVAC curbs and other penetrations. Include previous repairs and penetrations added after the original installation. Coordinate with relevant equipment specialists if the issue may involve condensate, plumbing or equipment operation rather than rainfall entering the roof.
5. Skylights and roof openings
Have qualified personnel assess accessible flashing and surrounding conditions. Skylights and roof openings present fall hazards; property staff should not approach or stand on them to take photographs. A cover or surface appearance is not evidence that an opening can support a person.
6. Drains, scuppers, gutters and downspouts
Identify the drainage route from the roof to its discharge point. Look for debris, damaged components and restricted outlets within the agreed inspection scope. Confirm which openings serve primary drainage and which provide overflow. Do not remove strainers or change overflow openings without appropriate review. See the commercial drainage maintenance guide.
7. Standing water and drainage patterns
Document areas where water persists and when photographs were taken relative to the end of rain. GAF's TPO/PVC ponding-water bulletin uses 48 hours after precipitation ends as its definition. That reference is not permission to wait when there is active leakage, unusual loading or possible structural distress. Drainage, roof condition and structural questions may need different specialists.
8. Roof traffic, debris and nearby work
Record debris and signs of damage associated with equipment maintenance or other trades. Review whether access routes are appropriate for the roof system. Coordinate housekeeping and protective measures before additional rooftop work. Do not store tools or materials on the roof without authorization and assessment.
Turn findings into a repair plan before the next storm
Request clear descriptions and photographs tied to locations. Separate issues requiring prompt safety assessment from maintenance items and longer-term capital decisions. A list of defects without priorities is difficult to use, especially when several tenants or buildings share one budget.
| Finding | Decision to make |
|---|---|
| Immediate safety concern | Restrict access and arrange the appropriate urgent assessment. |
| Active or recurring leak | Investigate the cause and define temporary and permanent scopes separately. |
| Routine drainage or detail maintenance | Agree on safe access, methods, disposal and completion documentation. |
| Widespread deterioration or moisture | Consider further testing and compare repair, restoration and replacement options. |
Do not select a coating solely because the roof looks old. A coating assessment may need moisture investigation, adhesion testing, substrate compatibility and drainage review. GAF's coating-versus-replacement guidance explains why a serviceable existing assembly matters. Concealing wet or deteriorated components is not a maintenance solution.
What can property staff safely check?
From normal accessible areas, staff can record interior stains, tenant reports, visible downspout damage and water appearing at unusual locations. They can gather records, confirm contacts and photograph conditions without approaching a hazard. Review the whole-property pre-storm checklist for additional ground-level topics.
They should not climb a ladder during bad weather, enter a damaged ceiling space, remove drainage covers or walk onto a roof without appropriate authorization and controls. OSHA's roof-tarping fact sheet emphasizes assessment of roof stability and the risks of work during wind or rain. Plan professional maintenance before those conditions arrive.
Close out the work and keep the record useful
Record the work completed, locations, materials or repair systems identified by the contractor, and any remaining recommendations. Keep photographs with the correct building and date. If an issue requires further investigation, do not mark it complete merely because a temporary measure was installed.
Review maintenance timing with the contractor and the roof manufacturer. Roof age, debris exposure, foot traffic, prior leaks and major weather events can affect the appropriate schedule. Revisit known locations after subsequent rainfall when safe, and record whether symptoms returned. A continuing issue deserves investigation rather than repeated cosmetic repair.
Questions about preparing a commercial roof for rain
Can a visual inspection prove the roof is watertight?
No. It can identify visible conditions and guide further work, but concealed moisture and some leak paths need additional investigation. Ask the contractor to explain the inspection's scope and limitations.
Should every commercial roof be coated before winter?
No. Some need localized repairs, some may be suitable for restoration, and others require a broader replacement assessment. The selected system also needs suitable preparation and an appropriate installation weather window.
What should happen if a leak starts before scheduled maintenance?
Follow the property's incident plan, isolate affected areas and contact the appropriate service provider. Keep staff off unsafe roofs. Water near electricity, sagging ceilings or structural concerns require urgent safety assessment.
Plan the roof portion of your facility maintenance
Brady Construction Group can discuss commercial roof maintenance, facility inspections and storm preparation for Southern California properties. Request service or call 909-293-9861 with the location, roof information and known concerns so the appropriate scope can be reviewed.