Up 20% since September, are James Hardie shares a good buy today?

James Hardie Industries PLC (ASX: JHX) shares are slipping today.

Shares in the S&P/ASX 200 Index (ASX: XJO) building materials company closed yesterday trading for $32.80. In afternoon trade on Tuesday, shares are changing hands for $32.71 apiece, down 0.3%.

For some…