Roof jointing is a process that is used to create a weather-tight seal between dissimilar roof coverings. This means, for example, if you have a slate roof and want to add some interlocking tile on top of it, JMCC Roofing will come in and install the necessary joints so that water doesn`t leak through your new tiles. JMCC Roofing also does this for all sorts of other different combinations like when you want to put plain tiles over existing tiles or change their pattern of them.