Nearly 70% of all construction jobs that require silt fence do not specify the type of fence that must be used. Save money by using our superior quality non-spec contractors grade silt fence: Economical 36" or 24" width silt fabrics (MISF 150) 1-1/2" x 1-1/2" (Nominal) hardwood stakes Stakes spaced every 10' (10' centers) 11 stakes per 100' fabric