How to Inspect for Moisture Intrusion Course

Attached is a picture of mold in a basement due to poor drainage from the downspout. Recommend adding splash block or drain tile to downspout.

Hello Internachi members

Heres one you’ll all see. Waterheater copper connection is corroded and leaking on the top of the tank.


Standard roof inspection with exposed nails.


Exposed nails and Flashing

This foundation is showing signs of moisture intrusion. It is leaking through a form tie rod hole. Recommend that all such holes should be filled with “waterplug” cement and check the outside drainage away from building.

This is a clogged or blocked drain in a pool deck that has a 12” soil section next to the house for plants. During heavy rain, this can result in water accumulation around the structure’s foundation. Accumulated water is a conductive condition to wood destroying insects and organisms, and may also cause the foundation to settle and possibly fail over time. This condition could also potentially stain the deck surface due to standing water as it dries out. Recommend a plumbing contractor to clear the blockage.

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Water dripping into base cabinet when faucet is turned on.

http://www.njhomeinspector4u.comThis picture was taken on an inspection of a condo unit. The down spouts for the roof gutters did not extend out five feet.

The photo is typically what I find in most all leaf saver gutters systems.
Most clients believe there are totally maintenance free. This gutter was installed 3 years ago and never cleaned. There’s was also moisture damage to the soffit due to moisture wicking up to the wood sheathing

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There was a significant leak around this toilet as a result of improper installation as well as a recessed toilet flange. The toilet did not have the typical flange bolt connectors so the plumber attempted to secure this toilet with silicone. This resulted in swelling of the subfloor and cracking of the ceramic tiles.

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Good post, Gabriel. You may be interested in the following article about inspecting bathroom fan exhaust http://www.nachi.org/bathroom-exhaust.htm

Hi everyone,

While in the attic to confirm that the bath exhaust vents were actually venting to the home’s exterior, I saw frost and black staining on the roof deck above the fans. While the vent was properly attached to an exterior roof vent, there was no connection at the bath fan assembly. The venting material was simply slipped over the fan and not sealed, allowing large amounts of warm, moist air into the attic.

Often builders pour concrete such as steps, stoops and patios over the top of siding and trim details, as is the case in this photo. Moisture is trapped between the concrete and trim resulting in wood rot. Ideally the siding or trim would be held up 1-2" above the concrete and flashing installed between the concrete and any structural wood behind.

on inspection of basement one of the outside walls showed paint bubbling up along most of the wall from middle area on down.no actual water or moisture seen at ceiling or on drywall.indicating it may be coming through wall from outside.
further investigation outside revealed
1.Landscaping outside this wall was angled toward wall where moisture appeared in basement.
2.HVAC unit slab was placed on top of slab from previous unit.Bottom slab from previous unit was angled toward the houses outside wall
3.Lanscaping decorative border stones showed signs of soil pooling up in this area indicating possible water flow into this area being pooled at the wall with no way of flowing away.

Wood posts in the crawlspace should not come in contact with the ground. Humidity from the ground will deteriorate structural wood.

Recent inspection showing a foundation built on a sand base with no footing. There was lot of ground water and the foundation had sunk 2 inches below the wood framing.

Moisture intrusion problem from inproperly sealed garage side door. Replacement of the door frame, sill and supports had to be completed.

Looking forward to the course!

Moisture wicking at foundation base. An exterior inspection confirmed poor downspout installation and incorrect grading at corner of structure on te opposite side.

The water stain in this photo is an obvious sign of past water intrusion, There is a second story wall directly above this area with possible defect in flashing.