It will be regularised and treated timber used for internal work like kits, joists, roofs etc. Treated but not suitable for ground contact....can't remember the name of the treatment.
Looks great, i'm planning on doing the same rear extension to my house in the next year or so. Also i too will do most of the work myself with the exception of electrics and a few other bits. What size is the rear extension, how long has that part taken and do you mind sharing a rough idea of cost?
I've been asked by someone to floor a section of their loft so they can get up to store some boxes, suitcases, christmas decs etc (nothing too heavy tho).
The roof is metal sheeting of some sort and the trusses are metal poles bolted at the top and fixed on to timber battens below which make...