Timbers to What? Need more information please, plus a picture wouldn't hurt.
What and where are you replacing?
Need more info please. Replace t timbers where?
Would you repeat your question with more details so that we may help you to do your project the best way.
Hello, Could you add some more information about timber replacement or post a picture to give us a better idea of your issue. That will help us all for the best suggestion suggestions and recommendations.