The fabric has a coating on the material to make it roll better. After 24-48 hours, this will break down and the water will go through normally. Competitive products will add a chemical to improve this water flow initially.  SRW does not add this chemical to keep it clean and free of unwanted materials. This chemical is called a surfactant and is only temporary. Once the fabric is installed and dirt and debris come in contact with the fabric, it reduces the tendency of the fabric to resist absorption. Installation of one side over the other does not have an impact on performance. If you would like to test the ability of the fabric to allow water to flow through, I would suggest adding a little dish washing soap to the fabric and rub it in.  Dish soap is also a surfactant and this is to show you that the fabric will allow water to flow properly once it is installed.  It is not necessary to add this to the entire application since installation on top of soil will have the same effect once your landscaping is installed over the top.