I have got a lean-to conservatory on one side of the house. There are a couple of water leaks from where it joins to the wall it has been installed against. I suppose the easiest repair is to get some crawling boards onto the roof and reseal between conservatory and roof. It is about 5m long and there is a long wooden batten against the wall, which the roof rests on, but how will this be fastened to the wall? Thanks.