Do Metal Roofs Need Maintenance? A Homeowner's Care Guide

How much maintenance does a metal roof really need?

Almost none. Unlike asphalt, an aluminum roof has no granules to shed and no coating to reapply, and unlike steel it has no rust to fight. There is no annual sealing, no repainting, and no scheduled service. The little upkeep it does benefit from is the same common-sense care any roof appreciates — keeping it clear of debris and clean — done mostly from the ground.

The simple care routine

A few easy habits keep an aluminum roof looking and performing its best. Keep gutters and downspouts clear so water drains freely; remove leaves, branches, and debris from valleys and around penetrations; rinse off dirt, pollen, or coastal salt spray a couple of times a year with a hose and a well-diluted, non-abrasive detergent using a long-handled soft brush; and trim back overhanging branches that rub the finish or drop debris. All of this can be done from the ground — for anything requiring roof access, hire a professional.

What to avoid

A few things can harm any metal roof: high-pressure washers (which can drive water under panels and mar the finish), walking on the roof unnecessarily (both a safety and a cosmetic risk), and contact with dissimilar metals or incompatible fasteners, which can trigger galvanic corrosion. Also avoid letting incompatible drainage — copper runoff onto aluminum, for example — sit on the surface. Interlock's installation uses compatible aluminum and stainless components specifically to prevent these issues.

Condensation vs. a real leak

If you see moisture in the attic, do not assume the roof is leaking. On a properly installed metal roof, interior moisture is often condensation caused by high humidity and inadequate ventilation — warm, moist indoor air meeting a cold roof deck. The fix is ventilation and vapor control, not roof repair. If you are unsure, have a professional check attic airflow and insulation before concluding it is a leak.

Step by step

1. Clear gutters and downspouts once or twice a year so water drains freely.
2. Remove leaves, branches, and debris from valleys and around roof penetrations — from the ground where possible.
3. Rinse dirt, pollen, or salt spray with a hose and a well-diluted, non-abrasive detergent using a long-handled soft brush.
4. Trim overhanging branches that rub the finish or drop debris onto the roof.
5. Check attic ventilation periodically to prevent condensation, and address any moisture at its source.