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ICF Prep for services


Adam2

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Am about to pour our first floor. It's a semi basement with no drainage so just thinking about providing electricity for exterior lights and a power run down to the garden. Don't want to drill through 200mm of concrete so thinking to put 3 steel conduits about 10mm dia through the walls now. 1 each for 2 external wall lights and 1 for power to garden. Is this best or should I do 1 conduit maybe 20mm and install conduit in the external eps ?

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Always drill after. Conduit cast in during a point can get bent or moved and then you need to re-drill anyway. The other issue is always light placement - until you know what the outside looks like, you may want to move the outside lights about so that is much easier to do if you haven’t been constrained by conduits already installed. 
 

32mm dry core diamond bits aren’t expensive for what you get and can be used with an ordinary SDS drill.  That is more than adequate to get most services into a house and can be sleeved with waste pipe and sealed without too much issue. 20mm conduit ideally needs a 22mm SDS bit but is easily drilled with a standard bit. 

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