Man works on mold-damaged roof

Man works on mold-damaged roof

Roofs have many hidden places where leaks can form, causing mold and headaches down the road. (DepositPhotos)

Even a small roof leak can lead to water damage and rapid mold growth in your attic — both of which are costly issues. Maintaining your roof and conducting a regular mold inspection is vital to catching damage early and preventing big issues later.

The question is, do you know where to look for leaks? If you’re like most homeowners, you probably don’t, so here are six places where your roof can leak.


Closeup of roof valley, the seam between two sections of black metal roofing

Closeup of roof valley, the seam between two sections of black metal roofing

Roof valleys are a common source for leaks. (DepositPhotos)

1. Old or Damaged Roof Valleys

A roof valley is where two planes of a roof meet, creating a seam of sorts in the roofing material. Roof valleys can be prone to leaks if the roofer doesn’t properly install and safeguard them.

You can spot roof valley damage by watching for discoloration, such as dark shingles or rust. During the mold inspection, it’s also a good idea to look up in the attic — specifically where your roof peaks.


Bucket in living room, collecting rainwater from leaking attic

Bucket in living room, collecting rainwater from leaking attic

If this is a familiar sight, check your attic for leaks. (DepositPhotos)

2. Leak from the Attic

An attic leak isn’t necessarily from your roof at all. While there may be damage somewhere on your roof allowing water into the attic, there could also be a ventilation issue.

If your roof is poorly insulated or has insufficient ventilation, temperature shifts can lead to condensation build-up — and you’d be surprised how much water condensate can create.

When you conduct your mold inspection, always check your attic as well. If there’s a humidity issue, make sure you have enough airflow and insulation. If that’s not the issue, consider purchasing an attic dehumidifier.


Man with glasses inspects mold damage on roof decking

Man with glasses inspects mold damage on roof decking

A rotting roof deck can’t be repaired. You need to replace it — immediately. (DepositPhotos)

3. Rotting Roof Decking

Roof decking is the support material of your roof. It sits directly above the trusses and joists and forms a surface or “deck” for the rest of your roof. It is a structurally integral part of your roof and, unfortunately, it can rot.

Roof deck rot is usually the result of damaged shingles, nail holes, ice dams, or poor gutter maintenance. A rotting roof deck can’t be repaired and must be replaced — and quickly.

Sagging spots are a tell-tale sign of roof decking rot. During the mold inspection, watch for an uneven roofline.

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