Читать книгу Garden Mosaics - Emma Biggs - Страница 20

For exterior locations you must use an exterior-grade board that can be either MDF or plywood (1). Because timber is a material that expands and contracts according to temperature and humidity, a highly flexible adhesive such as BAL Flex, or similar, is required. To reduce the amount of movement large boards should be braced at the back with battens of timber treated with preservative and screwed across the diagonals. The back of all timber boards should be protected from moisture with several coats of exterior paint or varnish.