A leaky duct that fills and drains periodically means you do not need to be so fussed about sharp stones in the backfill of soft sand. If he is more of a gardener, the backfill may be soil and random stones, and no form of SWA is guaranteed for that not to compromise the jacket almost immediately, free draining soil or not.
M.
Hello Mike, the S.W.A. duct will be situated under new paving slabs. I am not sure how the duct will drain. It is a double wall type preferred by ex Anglian Water employees.
A leaky duct that fills and drains periodically means you do not need to be so fussed about sharp stones in the backfill of soft sand. If he is more of a gardener, the backfill may be soil and random stones, and no form of SWA is guaranteed for that not to compromise the jacket almost immediately, free draining soil or not.
M.
Hello Mike, the S.W.A. duct will be situated under new paving slabs. I am not sure how the duct will drain. It is a double wall type preferred by ex Anglian Water employees.
