Leaking metal roofing is one of the most common problems. It's not always caused by poor-quality materials; most often, it's caused by improper installation, mechanical damage, or natural wear and tear. The latter two factors are independent of the coating's quality, so even choosing premium products doesn't guarantee a leak-proof roof throughout its lifespan. If a metal roof is leaking, a decision can only be made after a thorough inspection, and in some cases, testing with a scanner, endoscope, or other equipment.

The main causes of the problem

Moisture under the roofing is caused by condensation, which occurs due to temperature fluctuations, or accumulates as a result of rain or snow. The following factors can cause a leak in the structure:

1. Failure to follow installation procedures. Some errors arise from improper design: for example, if the load calculation is incorrect, the material is too heavy, causing the rafters to sag over time, and gaps to appear between the sheets. Furthermore, leaks can occur if the joints are not sealed with sealant, and condensation can form if the roofing sheet is improperly installed.

2. Natural wear and tear. Over time, metal rusts because even minor mechanical impacts damage the protective layer. Gradually, corrosion becomes permeable, allowing moisture to penetrate the roof through the holes.

3. Damage caused by impact loads. Heavy hail, falling trees, or other heavy objects can all damage metal roofing and cause leaks.

4. Roof joint leaks. Homeowners often complain of leaks at roof joints; solving the problem can often only be determined after diagnostics using specialized equipment. Particular attention is paid to valleys, chimney connections, antenna outlets, and dormer windows.

5. Lack of roof maintenance. For example, if gutters aren't cleaned, they become clogged over time, increasing the risk of leaks. And if snow and ice aren't removed from a flat roof in winter, the surface can deform under the weight of precipitation, causing it to lose its seal.

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How to fix a leak in a metal roof

Regardless of the cause, a roof leak can cause a host of problems, from mold growth to rafter collapse. There are several ways to fix the problem, but in any case, it's important to proceed step by step.

Diagnostics

First, you need to thoroughly inspect the roof to understand how exactly moisture is getting in. Pay particular attention to:

• any joints, abutments;

• points for attaching roofing screws;

• the space between the slopes under the valley;

• joints of sheets.

If there are rust stains, chipped paint, cracks, dents, or other defects on the surface, these areas require a thorough inspection. If no visible problems are found, diagnostics using equipment that detects hidden leaks may be necessary.