The First Heavy Rain Is Not the Time to Find Out Where Your Building Leaks

daniel33876

Oct 1

4 min read

What months of heat and dry weather may have hidden from view.

A building can appear perfectly fine when it hasn't rained. That sounds obvious, but it is an important distinction as Texas moves from months of intense summer heat toward a potentially wetter fall and winter.

A roof does not prove that it is watertight on a sunny afternoon. Flashing does not demonstrate that it was installed correctly until water reaches it. A drainage system does not reveal whether it can handle significant runoff until enough rain falls to test it.

The same is true of exterior walls, windows, doors, roof penetrations, mechanical curbs, transitions between different building materials, and previous repairs. Water is remarkably good at finding weaknesses.

The first prolonged rainfall should not be the first time those weaknesses are investigated.

A Building Is a System

One of the mistakes frequently made when evaluating property damage is looking at individual materials instead of understanding how the building works as a complete assembly.

A roof is more than shingles, panels, tile, or membrane. It includes flashing, underlayment, penetrations, drainage, transitions, edges, fasteners, sealants, structural support, and the adjoining materials that allow those components to function together.

The exterior walls operate the same way. Siding, masonry, windows, doors, flashing, weather resistant barriers, sealants, penetrations, and drainage paths all have roles in controlling water.

When one component fails, the location where water appears inside the building may be nowhere near the point where it entered. That becomes particularly important on commercial buildings and multifamily properties where roofs and exterior wall systems can be large, complicated, and difficult to inspect from the ground.

Look at the Transitions

Large uninterrupted surfaces tend to receive the most attention because they are easy to see, however, water problems often begin where different building components meet.

Where does the roof meet a wall?

How is a rooftop mechanical unit flashed into the roofing system?

How are pipes and vents sealed?

Where do different roof elevations meet?

How does water leave the roof?

Where do additions connect to original construction?

How are windows and doors integrated into the exterior wall?

What happens to water once it reaches the bottom of the wall assembly?

These locations matter because water management depends on continuity. A small failure at a transition can sometimes allow water to travel behind otherwise serviceable construction.

Previous Repairs Deserve Another Look

A repair that stopped a leak three years ago deserves attention before another wet season. So does an area that has been repeatedly sealed instead of permanently corrected.

Sealants are useful components of many building systems, but a tube of caulk is not a universal repair method. Repeatedly applying sealant to the visible location of a leak without determining where the water is entering can mask the symptom without correcting the underlying problem.

The same applies to roof patches, temporary coatings, replaced fasteners, repaired flashing, and previous storm repairs.

If a building has history in an area, that history matters.

Drainage Is Part of the Building Envelope

Water has to go somewhere.

On a steep roof, gravity moves it quickly toward the edge. On low slope commercial roofs, drainage design becomes particularly important. Roof drains, scuppers, gutters, downspouts, overflow provisions, grading, and ground drainage all contribute to moving water away from the building.

Debris, vegetation, deterioration, improper slope, damaged drainage components, or previous modifications can change how that system performs.

The same amount of rain can therefore produce very different results on two otherwise similar buildings.

Maintenance and Storm Damage Are Not the Same Thing

This is where property maintenance and insurance claims eventually intersect. Finding and correcting an existing maintenance condition before a storm is good property management.

If a future storm causes damage, having some understanding of the property's condition beforehand can also make it easier to determine what actually changed.

A leak discovered during a storm does not automatically prove the storm created the condition that allowed the water inside. Conversely, the existence of an older building or previous maintenance does not automatically establish that newly observed damage was preexisting. Those questions require investigation.

And investigation is much easier when someone understood the building before the weather changed.

Take Advantage of the Dry Weather

There is no need to turn routine property maintenance into a forensic investigation, but significant properties deserve periodic attention from people qualified to evaluate them.

Roofing systems should be inspected safely by qualified professionals. Drainage should be checked. Previous problem areas should be revisited. Exterior transitions should be observed. Known leaks should be corrected rather than postponed until the next rain.

For property owners and managers, the objective is simple. Know where you stand before the building is tested. Once water is entering the property, the conversation has already changed from prevention to damage control.