Problems, causes and repairs

A hot, fishy or burning-plastic odor near electrical equipment can indicate overheating and requires an immediate safety response.

A ceiling mark that darkens or expands following rainfall.

Frost on cold roof surfaces often reveals warm humid indoor air reaching the attic and freezing before it can dry.

A localized brown or yellow mark can reflect active water entry, an old dry stain or repeated condensation.

A diagonal crack can follow a drywall joint, local frame movement or broader settlement; change over time matters most.

A crack runs diagonally from the corner of an opening.

Flue gases spill into the building instead of rising safely outdoors.

Resistance, loose connections or failing equipment generate abnormal heat at an electrical component.

A poor connection creates resistance, heat and possible arcing.

Connected demand exceeds the intended circuit capacity.

A system or stored product releases volatile material.

Wastewater reverses through a drain due to blockage, surcharge or system failure.

Measure and adjust supply, extract and transfer pathways as a system.

Remove blockage, verify slope, outlets, joints and discharge during rain.

Restore flow, clean accessible pan surfaces and test under operating conditions.

Use a suitable short, smooth and serviceable path to outdoors.

Create a durable slope and drainage route away from the foundation.

Address valve closure, pipe support, pressure and suitable arresting measures.

Use a safe lightweight indicator to see which way air moves at a doorway or grille.

Relate a symptom to fill, heat, drain and dry stages of an appliance.

Map frost or wetting against ceiling penetrations, insulation depth and roof orientation.

Inspect an accessible cavity through a suitable existing opening.

Repeat photographs from the same position with a reference scale and date.

Record crack width and geometry from consistent reference points.

Use location and timing to separate moisture pathways, damp porous material and pressure changes around roof deck, insulation, ducts and ceiling penetrations.

Use location and timing to separate moisture pathways, damp porous material and pressure changes around below-grade walls, floor edges, drains and stored materials.

Use location and timing to separate moisture pathways, damp porous material and pressure changes around showers, drains, seals, extract ventilation and wet-room layers.

Use location and timing to separate moisture pathways, damp porous material and pressure changes around overnight occupancy, closed doors, cold corners and windows.

Use location and timing to separate moisture pathways, damp porous material and pressure changes around ground cover, joists, vents, ducts and foundation walls.

Use location and timing to separate moisture pathways, damp porous material and pressure changes around sinks, appliances, cooking moisture and concealed connections.

Provides broad visual assessment and directs specialist investigation.

Investigates rain, air, heat and vapor control layers.

Addresses site drainage, foundation water and below-grade systems.

Services heating, cooling, ventilation and condensate systems.

Investigates ventilation, contaminants, odors and exposure pathways.

Investigates electrical heat, odor, noise, tripping and unsafe equipment.