Ledge brace doors with two ledges

[bsr]

Hi, I'm making 1800 x 750 shed doors. Ledge and brace. They will be hung with two heavy duty hook and band hinges. The planking, ledges and brace are all made from 6x1.

Do I need a third ledge if I'm using two hinges? What does it achieve? Is it mostly to stop the planking bowing?

Thanks

 

[DAZB]

With a door that narrow it is fine with 2 ledges although adding another to the centre would strengthen it and also give you a solid point for a lock or hasp and staple position.