Hi Zoe,
Your questions have been addressed through the support ticket. However, I thought it would be helpful to post my answer here.
1/ From my understanding, the approach that you are taking is appropriate since you would still need to account for module A5 (reused materials (e.g. bricks) are stockpiled and will be reconstructed) in the LCA of the new proposed building. You may also find the modelling method in this support post useful.
2/ I think you are right that the recycling of material is relevant to the LCA of old buildings. You can find the default recycling method and rate for each type of material under End of Life Disposal / Recovery Methods of “Edit Material” tab. We recently released this multi-disposal methods feature that gives eTool users the ability to model a wide variety of disposal/End-of-Life scenarios. A new support post about this feature will be soon published so watch this space.
