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Three exterior walls

Our house is 1970's cedar, block and plaster exterior. We have three exterior walls that are horizontal cedar that require painting. Last painted green about 15 years ago. One has easy access and is maximum 3 metres high the other two are up to 5 metres high. Would need scaffolding or long boom cherry picker??. We have choosen an off white dulux paint. We also have interior rooms that require painting.