DIY Insulation - Questions

New to these forums and new to renovating.

I'm replacing the plasterboard in a few rooms of my house and want to insulate the external walls before putting on new plasterboard.

I have 2 large rolls of roof insulation (R1.8 glasswool which has the wool on one side and silver sarking on the other. It is the stuff they put between a tin roof and the beams they are being screwed to) which were left over from a recent roof replacement. Can I use this in my walls? I know it isn't ideal but it will save me a bit of money.

If I can use this roofing insulation should the silver side be facing the external or internal side? Would it be fine to just use a staple gun and staple it to the external wall (it isn't stiff like batts, it comes in a large roll (13000mm x 1200mm x 75mm))?

My house's exterior is weatherboard, I will need to buy a 1 bag of insulation batts. Should I use a silver sarking between the external wall and the insulation to avoid condensation affecting the insulation? Again for the batts can I use a staple gun or should they be stacked and held in place with packing tape?

thanks


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