Repair Library

13 guides

Leaks & Building

Water Leak: Find the Source and Control the Damage

Stop the water if there is an accessible isolation valve, keep people and electricity away from it, then trace the path from the lowest wet point up to the highest. Condensate, roof, supply piping, and drain leaks all look the same on a ceiling tile.

Leaks & BuildingPro

Basement or Lower-Level Water After Heavy Rain: First Checks

Lower-level water after storms often comes from exterior drainage, foundation joints, floor drains, sump failure, window wells, or sewer backup. First separate clean rainwater from sewage and electrical hazards.

Leaks & BuildingPro

Ceiling Leak After Rain? How to Trace Where the Water Is Coming From

A wet ceiling tile often is not directly below the exterior leak. Rainwater can travel along roof decking, framing, conduit, piping, insulation, or wall cavities, so document the wettest point and trace the path upward and outward.

Leaks & BuildingPro

Cracked Exterior Sealant: When to Recaulk and When Not To

Failed exterior sealant can admit water and air, but smearing new caulk over old material rarely lasts. Proper repair means removing failed sealant, preparing the joint, and preserving designed drainage paths.

Leaks & BuildingPro

Water Coming Under an Exterior Door: How to Find the Entry Path

Water at an exterior door can come through the threshold, failed sealant, door sweep, jambs, masonry joints, or exterior drainage that sends water toward the opening. Start outside and follow the path instead of immediately replacing weatherstripping.

Leaks & BuildingPro

Commercial Gutter Overflowing: Find the Blockage or Capacity Problem

Overflowing gutters usually come from debris, blocked downspouts, poor slope, undersized drainage, or roof water overshooting the gutter. Watch where the water actually goes.

Leaks & BuildingPro

Cold Pipe Sweating: Condensation or a Plumbing Leak?

Water on a cold pipe is often condensation, especially on chilled-water and cold-water lines in humid spaces. Dry the pipe and watch where moisture reforms before calling it a leak.

Leaks & BuildingPro

Commercial Roof Drain Clogged? Safe Inspection and First Response

A clogged roof drain can create dangerous ponding quickly. From a safe, approved roof-access position, remove loose surface debris and clear the drain strainer without entering deep standing water or probing into the drain line.

Leaks & BuildingPro

Commercial Roof Leak: First Response Checklist for Maintenance Staff

The first job during a roof leak is not permanent repair—it is protecting people and property, controlling interior water, documenting the leak, and giving the roofer enough information to find the source. Safe documentation during the event often saves hours later.

Leaks & BuildingPro

Supply Diffuser Sweating: Why It Happens and What Maintenance Can Check

A sweating supply diffuser usually means the diffuser or nearby duct surface is below the room's dew point. High indoor humidity, missing duct insulation, air leakage around the boot, low supply temperature, or poor airflow can all contribute.

Leaks & BuildingPro

Water Stain on a Wall but No Rain: What to Check

A wall stain without rain can come from plumbing, condensate, chilled pipes, restroom fixtures, irrigation, stored roof water, or cleaning. Timing and location are your best clues.

Leaks & BuildingPro

Water Stain Under an HVAC Unit: Roof Leak or Condensate?

A ceiling stain near HVAC equipment can come from condensate, chilled-water piping, roof leaks, sweating ductwork, or plumbing. The timing of the leak—rainy weather versus cooling operation—is one of the fastest ways to narrow it down.

Leaks & BuildingPro

Commercial Window Leaks During Rain? How to Find the Entry Point

Do not assume the visible wet spot is the failed joint. Water can enter above or beside a commercial window through perimeter sealant, flashing, masonry, glazing gaskets, or the wall assembly and then travel before appearing indoors.