What is Brimstone? Vastern Timber is proud to offer the Brimstone range of British thermally modified timber (TMT). Sourced exclusively from English and Welsh timber, Brimstone products are ideal for cladding, decking, external joinery and outdoor furniture. The Brimstone range is a great fit for Vastern Timber as the company continues to promote British … Continue reading Brimstone, British Thermally-Modified Timber