As the Polish law says we give 3 years of warranty on our constructions. A customer, can pass the waterproofing of wood (which is a DIN 68.800 norm) but it has to be signed on contract.
The wood in this case is delivered without any cover. Wood is a natural product which has irregular structure. It keeps some of the wetness depending on conditions of environment. Because of this it is natural that some gaps can show during drying processes and it can not be the cause of complaint. Bale buildings have high immunity for fire because of using an elements with massive diameter. Every bale is an unique element with individual properties.