STRONGSVILLE, Ohio -- Strongsville schools spent more than $1.1 million through the first two weeks of a teachers strike, according to figures the Strongsville Education Association shared Thursday after obtaining documents through a public-records request.

The teachers union estimates that the tab, which includes the cost of substitute teachers, will surpass $1.8 million by Saturday, the end of the strike's fourth week.

At a rate of $175 a day for each substitute teacher, the school district will spend $550,000 through four weeks, according to the union. The district also pays an additional $30 a day per substitute to the company that provides the replacements. That 20 percent fee is expected to cost the district an estimated $110,000 through Saturday.

Strongsville School District Treasurer Debbie Herrmann, Superintendent John Krupinski and school board President David Frazee were unavailable to confirm the union's figures.

The teachers said they received the documents after the 8th Ohio District Court of Appeals forced the district to provide them in response to a public-records request. The records include invoices from Huffmaster -- the company providing strike services -- and detail how much money the district is spending to keep the schools open.

Among the other estimated expenditures through four weeks are $338,000 for security officers, $87,000 for rented vehicles and $183,000 for lodging.

In a recent Plain Dealer story, Herrmann said the district paid $150,000 for substitutes during the second week of the strike, while the striking teachers typically earn about $460,000 in a week.

Although that alone represents a savings of $310,000, Herrmann and Krupinski both balked at calling the lower cost of substitutes a savings.

Tad Colbeck, an Ohio Education Association representative working with the striking teachers, said Herrmann's estimate of $460,000 is probably low, and he questioned whether she included insurance and retirement system costs in the total.

Both sides met Tuesday in Independence for nearly 12 hours with a federal mediator, but they emerged saying no progress has been made toward a solution and that no further negotiations have been scheduled.