Sacrificial wood for temporary roof

[LSB]

We are DIY Self building in 3 phases, over many years.

Phase 1 walls are finished with a temp roof, made from the old barn roofing sheets with the final posi joists as this is a separate roof.

 

We are now looking at doing the same for phase 2, but we don't want the final posi-joists as the whole roof needs to be done in one hit.

 

Does anyone know a good place to get 4*2 timber for joists that will ultimately become firewood.

they do need to be long long, one side is 4m and the other side 6m. 

I will need about 25 of each length.

These are partly to brace the walls until we are ready for whole roof and partly to allow us to store equipment which is currently in another part of the barn.

 

Any suggestions greatly received.

 

TIA Jill