Commercial roofing systems are designed to cover larger areas, withstand heavier loads, and cope with more demanding conditions than standard domestic roofs. Because of this, they face a unique set of challenges, and when issues arise, they can escalate quickly if not addressed. At LJ Roofing Melksham, we work with commercial property owners across Melksham, Wiltshire to diagnose and resolve roofing issues before they disrupt business operations.
Below are some of the most common problems found on large commercial roofs and why early intervention is essential.
Standing Water and Poor Drainage
Flat or low-slope commercial roofs are particularly vulnerable to standing water. When water fails to drain properly, it can pool on the surface for extended periods, increasing the risk of leaks, structural stress, and membrane deterioration.
Causes often include:
- Blocked drainage outlets
- Poor roof design or insufficient fall
- Debris accumulation from surrounding trees or machinery
- Membrane depressions caused by wear or movement
Regular inspections and timely maintenance help ensure water drains efficiently, preserving the long-term health of the roof.
Membrane Cracking, Shrinkage, and Blistering
Many commercial roofs rely on membranes to create a watertight barrier. Over time, exposure to UV radiation, temperature fluctuations, and general weathering can cause the membrane to crack, blister, or shrink.
These issues may lead to:
- Water penetration
- Weakening of the roof’s protective surface
- Separation at joints or seams
- Increased vulnerability during storms
Professional monitoring and timely repairs prevent minor membrane issues from becoming major failures.
Loose or Damaged Flashings
Flashings protect the edges, joints, and penetrations of a commercial roof, including vents, skylights, and HVAC units. When flashings deteriorate or become loose, water can easily infiltrate the building.
Common causes include:
- Thermal expansion and contraction
- Poor initial installation
- Corrosion or material fatigue
- Impact or vibration from mechanical equipment
Maintaining secure, properly fitted flashings is essential for keeping the roof watertight.
Structural Movement and Roof Surface Stress
Large buildings naturally shift over time due to temperature changes, loading variations, and foundation settlement. This movement can place stress on roofing materials, causing cracks, tears, or seam separation.
Visible signs may include:
- Uneven surfaces
- Creasing or folding of roofing membranes
- Stress points around plant equipment
- Localised depressions in the roof surface
Accounting for structural movement through professional installation and maintenance helps protect the long-term integrity of the roof.
Damage from Foot Traffic and On-Roof Equipment
Commercial roofs often carry far more foot traffic than domestic roofs due to:
- Maintenance access
- HVAC units
- Solar panels
- Extraction systems
- Satellite equipment
Regular footfall and equipment installation can cause abrasions, punctures, and general wear.
Protective measures such as walkways, pads, and controlled access help reduce this risk.
Gutters and Internal Drainage Blockage
Commercial buildings commonly use larger guttering systems or internal drainage channels. When these become blocked, water can back up quickly, leading to leaks, overflow, and pressure on weak points.
Causes include:
- Leaves and debris
- Moss accumulation
- Broken fittings
- Lack of regular maintenance
Routine clearance and monitoring are essential to avoid costly water-related damage.
Plant Growth, Moss, and Algae
Flat commercial roofs often retain moisture, making them susceptible to moss and algae growth. Over time, biological growth can trap water, accelerate surface deterioration, and block drainage outlets.
Conclusion
Large commercial roofing systems face a range of challenges, from standing water and membrane deterioration to drainage issues and damage from foot traffic. Identifying and addressing these problems early is essential for preventing disruption and protecting the building’s structure.
For property owners in Melksham, Wiltshire, LJ Roofing Melksham provides professional inspections, repairs, and maintenance to keep commercial roofs performing at their best. If you have concerns about your rooftop or want to schedule a detailed assessment, contact us today to arrange a friendly site visit.
Call us on: 01225 434 494
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