Andrew Posted September 25, 2019 Share Posted September 25, 2019 Our groundworks are (hopefully) starting really soon and I need to specify the trenches required and what goes in each. By way of background in addition to the main house we have a detached double garage with a 40m2 studio / office space in the roof. This contains a small bathroom with shower. Fortunately the garage is only about 3m away from the ground floor plant room (in the house) at the nearest point, so the plan is to use a single ASHP to run UFH and DHW for the house and garage with an unvented hw cylinder in the plant room (in the house) - mainly to save duplication and keep things simple. All of the drainage for foul water + surface water runs are already specified separately. Current thinking is :- Garage <-> House (plant room) Cold Water Insulated DHW feed Electricity (substantial as incoming mains will be terminated in garage and then run to house - also PV generation on house and garage + possible battery storage in garage) Cat 6 x 12 (ethernet, 4K video, probably more + redundancy) Insulated UFH flow and return UFH control cable (from thermostat - timer / controller will be in house plant room) Gate Pillars <-> House (plant room) Electricity (for electric gates, lighting + intercom) Cat 6 x 4 (one is required for intercom rest for redundancy) Garage -> Packaged Treatment Plant Electricity (for pump) General I also need to think about things like - Sky Dish External Lighting Alarm sounder box External CCTV cameras is it worth trying to bring these out through the foundations or is it best to make penetrations for these at the appropriate places and seal the airtight layer really well then? Is there anything obvious I've forgotten? (more than likely will be) What are the rules for combining service in trenches. I'm pretty sure we can't just dig one big trench between the house and garage and stick everything in!! Any and all thoughts / contributions very gratefully received. Link to comment Share on other sites More sharing options...
nod Posted September 25, 2019 Share Posted September 25, 2019 31 minutes ago, Andrew said: Our groundworks are (hopefully) starting really soon and I need to specify the trenches required and what goes in each. By way of background in addition to the main house we have a detached double garage with a 40m2 studio / office space in the roof. This contains a small bathroom with shower. Fortunately the garage is only about 3m away from the ground floor plant room (in the house) at the nearest point, so the plan is to use a single ASHP to run UFH and DHW for the house and garage with an unvented hw cylinder in the plant room (in the house) - mainly to save duplication and keep things simple. All of the drainage for foul water + surface water runs are already specified separately. Current thinking is :- Garage <-> House (plant room) Cold Water Insulated DHW feed Electricity (substantial as incoming mains will be terminated in garage and then run to house - also PV generation on house and garage + possible battery storage in garage) Cat 6 x 12 (ethernet, 4K video, probably more + redundancy) Insulated UFH flow and return UFH control cable (from thermostat - timer / controller will be in house plant room) Gate Pillars <-> House (plant room) Electricity (for electric gates, lighting + intercom) Cat 6 x 4 (one is required for intercom rest for redundancy) Garage -> Packaged Treatment Plant Electricity (for pump) General I also need to think about things like - Sky Dish External Lighting Alarm sounder box External CCTV cameras is it worth trying to bring these out through the foundations or is it best to make penetrations for these at the appropriate places and seal the airtight layer really well then? Is there anything obvious I've forgotten? (more than likely will be) What are the rules for combining service in trenches. I'm pretty sure we can't just dig one big trench between the house and garage and stick everything in!! Any and all thoughts / contributions very gratefully received. We put electricity gas and water all in one trench and a duct for anything else that may come along later Link to comment Share on other sites More sharing options...
Onoff Posted September 25, 2019 Share Posted September 25, 2019 Find out who your DNO is or water, telecoms etc provider. A pretty, detailed PDF will be on their web site ref service trench requirements. Something like this: http://www.swanage.gov.uk/userfiles/file/Documents prepared by Kehr and Tucker/Mains Trenching Guide Colour 2012.pdf Link to comment Share on other sites More sharing options...
Dreadnaught Posted September 25, 2019 Share Posted September 25, 2019 (edited) I wonder why none of those trenching guides show drain pipes (either waste or storm water) in the shared trench. Can they go in the same trench? Edited September 25, 2019 by Dreadnaught Link to comment Share on other sites More sharing options...
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