Am considering Marshall's Drystack cladding for cladding a porch. However all the online installation info I have been able to find refers to installation on a block brick garden wall only whereas one of my walls is stud and OSB. Marshalls do refer to using internally on a stud wall (emphasising that the product has not been tested on this substrate) but I am unsure about using the supplied Sika adhesive on OSB. Would it not be better using a good powdered tile adhesive? Has anybody used this Marshalls (or similar) system?