Triassic Posted February 12, 2018 Share Posted February 12, 2018 I’ve had the basement dug out into a hillside and I’ve just started levelling ready to install the insulated raft foundation. Before I do that, I need to install a foul drain to serve a bathroom, along with a spur to the storeroom containing the thermal store. The problem I have is that we hit limestone bedrock, so I’ll need to chisel out a slot around 20m long into which the Darin will go. What is the minimum depth the Building Inspector is likely to find acceptable? Link to comment Share on other sites More sharing options...
ToughButterCup Posted February 12, 2018 Share Posted February 12, 2018 3 minutes ago, Triassic said: [..] . The problem I have is that we hit limestone bedrock, so I’ll need to chisel out a slot around 20m long into which the Darin will go. [...] Oooooooooofffffff Link to comment Share on other sites More sharing options...
PeterW Posted February 12, 2018 Share Posted February 12, 2018 50mm bed of pea gravel is fine Link to comment Share on other sites More sharing options...
Ian Posted February 12, 2018 Share Posted February 12, 2018 33 minutes ago, Triassic said: What is the minimum depth the Building Inspector is likely to find acceptable? There's no minimum depth as far as I know however you'd need to check with your BCO. If it's very shallow they may want you to surround the drain in concrete with movement joints at each pipe joint Link to comment Share on other sites More sharing options...
MikeSharp01 Posted February 12, 2018 Share Posted February 12, 2018 I have a friend with an explosives licence - she might be able to 'create' a feature in which to run the pipe! Link to comment Share on other sites More sharing options...
Triassic Posted February 13, 2018 Author Share Posted February 13, 2018 Just to clarify, the ground surface is limestone bedrock, how deep into the rock would I need to dig ? Link to comment Share on other sites More sharing options...
PeterW Posted February 13, 2018 Share Posted February 13, 2018 If you are less than 200mm below the surface to the top of the pipe, from memory I think you need to encase in concrete. http://www.marleyplumbinganddrainage.com/media/5423/pipe-laying.pdf Link to comment Share on other sites More sharing options...
Triassic Posted February 23, 2018 Author Share Posted February 23, 2018 Had a helpful conversation with our Building Control guy, he’s happy with 50mm of concrete cover over the pipe encased in rock. Link to comment Share on other sites More sharing options...
Triassic Posted March 8, 2018 Author Share Posted March 8, 2018 (edited) Just one further question. I was thinking of running a drain from my thermal store to the sewer 12 metres away. Is this OK run in 40mm waste pipe, is 40mm big enough? Edited March 8, 2018 by Triassic Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now