From the Post:
Replacing marble front could be an option
First Canadian Place
Matthew Coutts, National Post
Published: Friday, May 18, 2007
The owners of First Canadian Place did not rule out replacing the building's entire marble cladding yesterday, something a similar Chicago skyscraper did after marble panels started dropping to the streets below.
Engineers have been inspecting the 72-storey building since a 140 kilogram marble tile fell from the 60th floor on Tuesday, to determine what has to be done to make the tower safe. Among the options: Replacing the building's 44,000 marble tiles.
"I can't really speculate on any long term or short term solution until our engineers report in. We'll be coming up with a plan of action, but don't have any specifics yet," said Melissa Coley, a vice-president at Brookfield Properties.
First Canadian Place, completed in 1975, was one of two marble- clad skyscrapers designed by architect Edward Durell Stone to finish construction in the '70s. The other, Chicago's Standard Oil building, now named the Aon Center, was completed in 1973 and began having issues with its marble exterior almost immediately. In 1990 the task of replacing 43,000 marble tiles with granite ones began. It cost US$80-million.
The buildings' exterior shells, Italian carrara marble, are rarely used in construction because of how poorly they stand up to the elements, said Harry Stinson, Toronto's best-known real estate developer, who manages the nearby One King West condo/ hotel.
"Water is the worst enemy to a building. If it penetrates into the skin of the building, into the marble, in behind the marble, the marble will absorb moisture. With any material that absorbs water, over time, situation are likely going to arise," he said.
"It is a grand material, but I think its use is best confined to an ornamental base of the building. To do an extremely tall building all in marble cladding is historically not a good thing to do."
The marble tiles are about 18 inches by 36 inches and one and a quarter inches thick. They are inspected frequently by Brookfield Properties to ensure they are holding up to natural wear and tear.
"Twice a year they did an audit of the panels. They've been replacing panels as they thought appropriate to change. Over the last couple of years they've been replacing panels," said Jim Laughlin, Toronto's deputy chief building official.
Although Brookfield had itself identified hundreds of the panels as potential hazards, Mr. Laughlin said the city was not aware of any potential risk until they were alerted on Tuesday night, at which point they ordered First Canadian Place to make the area safe.
"They're active in assessing the panels that are remaining in order to determine very quickly if there are any at all that have any similar characteristics to the one that got dislodged and fell," he said. "We still consider the building to be in an unsafe condition."
King Street remained closed to traffic yesterday, and will remain so until the city is satisfied the area is secure, he said: "If there are any [tiles] left that are any potential risk, they'll replace them immediately. When they can verify for us that everything is in a safe condition then we'll open up King Street."
Engineers have not suggested replacing all of the panels, and the city has not requested it.
"I don't think it's necessary. [The engineers] have not made any indication of replacing all the panels," Mr. Laughlin said.
Mr. Stinson said he would think now is the time to make a change similar to what happened in Chicago.
"They could do the very extensive process of removing every panel and refastening it. I think if they're going to go to that extent they would probably be better off to put different panels on instead of a slab of white marble," he said.
"I think it would be an opportune time to put some new material on that building or else the same thing's going to happen."
First Canadian Place was bought by Brookfield Properties 18 months ago from Philip Reichmann's O & Y Corp. It is home to the Toronto Stock Exchange and the head office of the Bank of Montreal.
© National Post 2007