Lean-to polycarbonate greenhouse against the house
I am planning to build a lean-to greenhouse on the southwest corner of my house (on the west wall). The house is cavity brick wall with insulation installed. I am wondering whether there will be humidity/mold/moss/rot or any other degrading issues in the greenhouse or the house itself caused by leaning the greenhouse against the house? Are there any recommendations on leaving a gap of air between or inserting some sort of membrane/insulation between house and the greenhouse? Or is it ok to leave the brick wall exposed to the inside of the greenhouse?
thank you very much for any advice or suggestion?