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Best approach for fixing failed 110mm waste drain
Anonymous user 01/03/2024 - 2.59 PM
Hi there, Another day, anther question! ;) Back once again to ask for your sound suggestions please - this time regarding repairing/replacing failed drainage..... We are purchasing a house, with a 14m drain length (between manholes) running adjacent to the side of house, which has failed in several areas over 4m near 1 manhole (confirmed via CCTV survey). These are old clay pipes (probably dating back to house construction in 1930s), which sit under a 1m wide concrete pathway (few inches thick i'd imagine), and 2m of this pipework also runs under a small raised porch. We'd prefer not to rip up the porch, but maybe ok with removing the concrete pathway if needed. This drain is a private waste one (ie - not shared) This needs replacing as the leak is causing soil 'heave' (clay soil), so we wanted the ground drying up before we see if any house foundation work is required to address cracking We're looking for the best approach. So would love to hear your thoughts on how we proceed. Our initial thoughts were 1) short term fix via drain sleeve patching, to prevent further water leaking & allow the soil to drain properly 2) once clay soil has dried, see what groundwork may be needed for house foundations (hoping to drill holes for resin injection, but worried about drilling through pipes) 3) Then get pipework properly addressed long term using pvc pipes, via trenchless replacement. As we may build an extension over it, we want a durable solution Does anyone think this is a suitable approach, or have other suggestions? Also, does anyone know the rough cost £/m for trenchless techniques like moling or pipe bursting? Any advice from you guys as to which option you'd choose, approach to fixing it, or rough costs would be most invaluable Many thanks for your time :) Mark
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3 Answers
Anonymous user
A.F. Complete Building