News & Advice

Building codes generally do not recommend more than two shingles layers on a roof for safety and structural reasons.

Building codes and manufacturer recommendations might restrict the number of shingle layers for a few different reasons…

1. Weight – Each layer of shingles adds significant weight to the roof structure. Excessive weight can strain the roof framing and compromise its integrity, leading to sagging, structural damage, or even collapse.
2. Durability – Multiple layers of shingles can trap heat and moisture, accelerating the deterioration of the roofing materials. This can result in premature aging, curling, cracking, and leaks.
3. Fire Hazard – Additional layers of shingles increase the potential fire hazard. In the event of a fire, multiple layers can contribute to the spread of flames and make firefighting efforts more challenging.
4. Aesthetics – Adding multiple shingles layers can create an uneven surface and affect the roof’s appearance. It may also make it more difficult to install new roofing materials properly in the future.

If your roof has multiple layers of shingles and requires replacement, talk to a licensed roofing contractor to assess the roof’s condition and determine the appropriate course of action.