Repairing Metal Building Roofs and Wall Panels in Houston
Metal buildings are everywhere in the Houston area: warehouses, shops, churches, self-storage, flex space and industrial yards. They go up quickly and hold up well, but Houston's heat, humidity, heavy rain and storms wear on them. Over time, fasteners loosen, sealants fail, panels rust and leaks start showing up over racking, equipment or office ceilings.
The good news is that many metal building problems can be repaired without replacing the whole roof or wall system. This guide explains the most common problem areas, the repair options and how to plan the work. It is general information; a contractor experienced with metal buildings should inspect your building before you commit to a scope.
Common leak points on metal roofs
Most metal roof leaks start at the same places:
- Fasteners: exposed screws with worn or cracked rubber washers, or screws that backed out as panels expand and contract in the heat.
- Laps and seams: sealant between overlapping panels dries out and lets water in.
- Ridge caps and trim: loose closures and trim let wind-driven rain in.
- Penetrations: pipes, vents, exhaust fans and rooftop units are common leak spots.
- Skylights and translucent panels: older panels crack and get brittle.
- Gutters and valleys: clogged or rusted gutters back water up under panels.
Leaks can travel along purlins before dripping, so the drip inside is often not directly under the hole. Marking interior drip locations on a floor plan and comparing them with a roof walk helps the contractor trace each leak back to its source instead of guessing.
Rust and corrosion
Houston's humidity, plus industrial or coastal air in some areas, can speed up corrosion. Watch for:
- Surface rust at cut edges, laps and fasteners.
- Rust where panels touch dissimilar metals.
- Rust at the base of wall panels where they meet the slab or soil.
- Rust on gutters and downspouts.
Surface rust can often be cleaned and coated. Rust that has eaten through a panel usually means replacing that panel.
Wall panel problems
Wall panels see damage from forklifts, vehicles, storms and water at the base. Typical repairs include:
- Replacing dented or punctured panels.
- Repairing the base trim where the wall meets the slab.
- Sealing around doors, windows and wall penetrations.
- Replacing damaged overhead door jambs and trim.
Storm damage
Hail and wind can dent panels, loosen trim and lift roof sections. After a storm, document the damage with photos and contact your insurance agent. The Texas Department of Insurance has tips for after hail or windstorms. Properties along the coast may have windstorm coverage through the Texas Windstorm Insurance Association. Our guide to storm damage repair for commercial properties explains the claim and repair process.
Repair options
Fastener replacement
Replacing worn screws with new screws and washers, sometimes one size larger, is one of the most effective fixes for an older metal roof.
Seam and lap sealing
Cleaning and resealing laps and seams with compatible sealant or seam tape.
Spot panel replacement
Removing badly damaged or rusted panels and installing new matching panels.
Roof coatings
Coating systems can seal seams, fasteners and minor rust over the whole roof. They work best on roofs that are still structurally sound.
Retrofit roof systems
Installing a new roof over the existing one, using framing or a new membrane system. This can be an option when the existing roof is worn out but the structure is sound.
Full replacement
When panels are badly corroded or the building is being renovated, replacing the roof or wall system may be the long-term answer.
Restoration vs. replacement
The right choice depends on the condition of the panels, the structure underneath, the building's use and how long you plan to own it. Industry resources from the Metal Building Manufacturers Association and the Metal Construction Association can help owners understand metal building systems and roofing options. Get a written assessment that explains why the contractor recommends repair, restoration or replacement.
Insulation and condensation
Older metal buildings often have worn or sagging insulation. Wet or damaged insulation can make a roof look like it is leaking when the real problem is condensation. Replacing insulation during roof work can solve both comfort and moisture problems. If the building is being converted to offices or conditioned space, our guide to warehouse office buildout questions covers related items.
Safety on metal roofs
Metal roofs can be slippery and hot, and older skylights can break under a person's weight. OSHA explains employer requirements for fall protection, including protection around skylights and roof edges. Make sure your contractor has a safety plan before anyone goes on the roof.
Permits
Many small repairs do not need a permit, but larger roof replacements, structural repairs or retrofit systems may. In the City of Houston, the Permitting Center lists a commercial roofing permit and a commercial repair permit. Your contractor should confirm what applies.
Insurance inspection lists
Metal building repairs often show up on insurance carrier inspection reports. If you received one, our guide to working through a commercial insurance inspection repair list explains how to organize and document the work.
Planning checklist
- Interior leak locations marked and photographed
- Roof and wall walked by a qualified contractor
- Fasteners, seams, trim and penetrations checked
- Rust and storm damage documented
- Repair, restoration or replacement options compared
- Insulation and condensation reviewed
- Safety plan confirmed
- Permits confirmed
- Work scheduled around operations
Have leaks, rust or storm damage on a metal building? BPC Development LLC provides free on-site estimates in Houston, TX. Call (281) 301-4737.