(Reuters) – Britain’s top homebuilder Barratt Developments Plc on Wednesday joined rivals in signing a government-mooted pledge to remove flammable roof coverings from buildings, which came into focus after the deadly Grenfell Tower fire in London in 2017. Barratt, which signed the pledge a day after rivals Persimmon and Taylor Wimpey, said it expects an expense of about 350 million-400 million pounds ($458.2 million-$523.7 million) to make the fire safety-related changes after it reviewed its buildings above 11 metres high built over the last 30 years in England, Scotland and Wales. The remov…