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Product variation and calculation of averages The insulation board is provided in several dimensions and thicknesses. Please use the conversion table below for other sizes than the declared unit. Product description Thermodren is a board which is for insulation and drainage outside on the cellar wall. The horisontal and vertical holes in the board makes sure that the water from the outside get into the holes and down into the drainage pipes. The holes also make sure that the cellar wall keeps dry. The board can also be delivered with a non voven textile to prevent small particles to clog up the holes. Thermodren can also be used for on blue/green roofs and terrace.