The cathedral was built 100 years ago
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A crane is being brought in to take pictures of crumbling stonework at Truro Cathedral.
Architects will use the evidence gathered on Thursday to put together a bid for funding to English Heritage.
More than £3m is needed to restore the 100-year-old building.
The cathedral's architect Maggie Davis says some parts are more in need of work than others.
Latest survey
"The bulk of the cathedral is granite, but all the dressings are bathstone and bathstone doesn't really like the climate in Truro.
"We need to identify the problem, to look at the scope of the work and to discuss the implications with English Heritage."
Ms Davis will be hoisted up in the cherry-picker so she can find out exactly what needs doing to the West front and Western towers.
The latest survey of the Cathedral says it will take 10 to15 years to bring the building up to scratch.
The whole restoration is likely to cost around £3.6m.
The West front alone will need just under £1m spent on it.