Dr. Richard B. Thibadeau, 92, a psychiatrist who was the founder and director of the Cedarcroft Sanitarium in Silver Spring and the LeDeau Gardens nursing home in Kensington, died of kidney failure Wednesday at Suburban Hospital in Bethesda.

Dr. Thrbadeau was born in Atlanta and grew up there and in Washington. He graduated from the National Pharmacy College here in 1907 and from Georgetown University medical school in 1926.

He became a psychiatrist and for the next 14 years he was on the faculty of the Georgetown medical school. He also established a private practice and for seven years was an assistant psychiatric examiner in the courts here.

In 1940, he built the Cedarcroft Sanitarium and ran it until 1961. In 1955, he established LeDeau Gardens. He sold his interest in that facility in 1967, when he retired.

His first wife, the former Marie Elizabeth Nies, died in 1974.

Survivors include his wife, the former Lena Dunkum of Germantown; four sons, Louis E. of San Francisco, Dr. A. Frank of Silver Spring, Dr. Joseph H. of Washington, and Dr. Robert T. of Rockville; two daughters, Marion T. Eppard of Silver Spring, and Jeanne T. Herlong of Bethesda; 25 grandchildren, 32 great-grandchildren, and two great-great-grandchildren.