Just seeing if it's feasible to leave my sunroom roof as is and : 1 cover it with rubber sheet stuck on :2 fill the underside with celotex then cover with upvc soffit boards. Basically to save stripping it all and rebuilding with extra joists to take the weight of boarding and felt. It's 4m long by 2m and a simple lean to @ the back of the garage to under the eaves of the bungalow. Work could be done from above off a Youngmans supported on the garage and a tower scaffold. Over to you guys and thanks in advance.