Tomorrow I will be installing the land drain round our slab base and was wondering if I need to wrap the perforated land drain pipe (solid 110mm pipe with a seam of drilled holes) with geotextile or not? The slab design does not call for it but given we are on clay it may stop the silt from getting into the pipe but will it clog up the holes. I will bed the pipe in pea shingle but again this is not called for in the slab design as the whole thing is encased in type 1. Any thoughts anyone?