The US housing market is stumbling, which makes two of Canada’s top lumber producers, West Fraser Timber Co. and Canfor Corp., to suffer from a lower demand from the US.  According to Bloomberg, the US housing starts dropped 8.8% in March and its weakness can’t support the lumber prices at its current levels. The US is the biggest market for Vancouver-based Canfor and West Fraser, which manage timberlands in British Columbia that supply softwood such as Spruce-Pine-Fir, a widely used material used to construct house walls and roofs.  Moreover, the ...