tvrulesme Posted February 19, 2023 Share Posted February 19, 2023 We're in the process of planning an extension and part of the building works will be to sort out some landscaping issues as well as some internal damp problems caused by high exterior ground levels. The site is complicated, overall it slopes quite a lot and the detached garage is 465mm above the house. We are trying to achieve: Lower the patio ground levels. I've dug a trial trench around the property and the internal damp now seems to be under control Have a multi level patio as the whole site slopes downwards but we want the areas to be usable for a seating area Finished surface to be yorkstone pavers which will finish a minimum of 150mm below DPC and floor levels All existing rainwater connects to combined waste and BCO has agreed that future rainwater can also join to this as there is no place for a soakaway or any other alternative The building is grade II listed and they are very fussy about changing anything in the existing structure but have agreed to allow channel or french drainage Drainage will most likely be ACO Hexdrain Current plan is the below which looks complicated but makes every effort to move the water away from the old damp house towards the garage which is much (465mm) higher so will be way below DPC. Some pictures to show the site Trial trench around property to reduce damp Looking towards where the new extention between the two buildings will be Upper Patio with gates Just looking for advice on whether this makes sense or if I am over-complicating it with my nerves over the damp issues? Link to comment Share on other sites More sharing options...
tvrulesme Posted February 19, 2023 Author Share Posted February 19, 2023 Option 2. Much simpler but requires me having faith in the channel drain's ability to take the water away from the wall Link to comment Share on other sites More sharing options...
ETC Posted February 19, 2023 Share Posted February 19, 2023 1 Link to comment Share on other sites More sharing options...
tvrulesme Posted February 19, 2023 Author Share Posted February 19, 2023 35 minutes ago, ETC said: Thanks so much @ETC. Can't believe I didn't think about that. Presumably I could use this and still connect a small section of channel drain to the section by the driveway to prevent me having to also dig that part up? Link to comment Share on other sites More sharing options...
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