BERKELEY, Calif. — The apartment balcony that collapsed last week, killing six college students, injuring seven others and shocking the country of Ireland, had significant dry rot, as did the similar cantilever balcony below, according to a city of Berkeley analysis released Tuesday.

Based on the report, the city plans to recommend to the City Council new and modified regulations to enhance the safety of all current and future buildings, according to a city news release. The changes would require stricter materials, inspection and ventilation standards for balconies and areas exposed to weather.

If passed, property owners of R-1 and R-2 residential structures in the city would be required to inspect any weather-exposed balconies, decks, landings and more for dry rot or other damage.

Going forward, owners would have to pay for an expert to clear such areas every five years and provide proof of completion to the Housing Code Enforcement Office.

“The purpose of this analysis is to identify potential contributing factors to this tragedy, so that the city of Berkeley can take proactive measures to prevent future such events through changes to its local codes,” wrote the city’s building and safety manager, Alex Roshal, in a 10-page memo Tuesday to the director of planning and development and other city officials.

The letter gave the most thorough description to date of what may have led to the balcony’s collapse, stopping short of citing dry rot as the cause but confirming what many experts had already concluded — that water infiltration compromised the structural integrity of the balcony.

The five Irish students and a young woman with both Irish and American citizenship were killed June 16 when the fifth-story balcony they were standing on during a birthday party at the Library Gardens apartment complex suddenly gave way.