Water can cause considerable damage to your home. There are various ways that rainwater can damage your home. For one, rain can curl under the eaves of the roof and down siding, causing mold and damage to paint. Rain that pools near your foundation can seep into the basement if it isn't properly sealed.
well, sidings are the boards either plastic or wood or any other materials overlapping together, rain drops are not supposed to seep in and cause mold unless the sidings lost its original integrity. same as long as the foundation is solid, it will be able to block the rain water