Why cover perforated drain with a filter?
What I see and read says that a perforated drain ships be covered with a sock or landscape fabric. Since filters clog logic says they will eventually clog creating an expensive repair. Have these filter fabrics been in use long enough to prove they don’t clog? I would rather leave out the fabric and ensure the pipe can be flushed.
Replies
So you'd rather have the pipe fill with silt??
Shouldn't just be the pipe
The filter fabric, should enclose a bedding of cleen draining granular material in which the pipe is bedded.
The fabric is to prevent the movement of fines. Soem people think this is to prevent sediments clogging the drain pipe.
I was taught that it was to prevent the fines from migrating into the fileter bed, and causing subsidence of the surface due to volume loss at depth.
Realisticly if the envelope is designed correctly the filter fabric will probably never clog. There shouldn't be enough velocity to carry much sediment at all.