Can you put a new commercial roof over an old one?

Yes, if the building has only one existing roof and it's dry and sound. Code allows one recover. Your local building department still has to approve it.

How many roof layers does building code allow?

The IBC allows two layers in total: the original roof and one recover. If the roof already has two or more layers, code requires a tear-off to the deck.

Is a roof recover cheaper than a tear-off?

Usually, yes. A recover skips demolition and disposal costs. However, wet insulation, deck repairs, or wind uplift upgrades can erase those savings.

Does a roof recover need a permit?

In most jurisdictions, yes. Reroofing typically requires a permit, and that includes a recover. Check with your local building department before work starts.

Can you recover a roof with wet insulation?

Not if the wet insulation leaves the roof unfit as a base. Still, crews can sometimes remove small wet areas first. Widespread saturation almost always means a full tear-off.

Who decides if my roof qualifies for a recover?

The authority having jurisdiction, usually your local building official, decides. That office enforces the code edition your area adopted, plus any local amendments.

low slope roofing Archives - North American Roofing

September 29, 2026

September 29, 2026

Roof Recover vs. Tear-Off: What Building Code Allows

Can You Install a New Roof Over an Existing One? Building code allows one recover over one existing roof. If your building already has two roofs, […]