I need some advice on my single brick conservatory that is attached to the back of my house that i want to convert into "an indoor" living area. What I mean by this is that I have upvc doors into it now and I want to take them down to open up the space. Rather than build another single block on the inside and insulate is there anything on the market that is a lot thiner and then plaster over the top, I then intend to either put a proper sloping roof with velux windows in or was hoping there is a insulated noise free from rain plastic type roofing.