Sounds like a Flysch formation, but there are many variations of it; rock mass properties are markedly anisotropic, usually 2 preferential directions are used in description: parallel to bedding and normal to it.
As Geopavetraffic says, your problems are not clear. That kind of bedrock may be weak, very weak, strong, very strong if massive and well cemented sandstone. Response to groundwater and weathering varies accordingly.
Foundation is a one-storey log-hut or a highway pile?