Location of plastic ducting in walls?

[lastbuilders]

Hi,

I am putting in a HRV system in my self build which means that I have some plastic pipes running down the external and internal walls. My plasterer is starting next week and I wanted to check if there is any standard way of marking where the pipes are in the walls for the future? I took pictures of the walls b4 the plasterboard was put up but maybe there is a more common/better way of marking these? Also, is there anyway of protecting the pipes?

Lastbuilders

 

[simp]

I was going to suggest something like this:-
Bosch PDO Multi
http://tinyurl.com/nyzso
But it doesn't detect plastic...

 

[lastbuilders]

I saw one of them in B&Q at the weekend but as you have said it won't detect plasic. Maybe I can run a wire alongside the plastic???

Lastbuilders

 

[simp]

Are you securing the plastic pipes to battens? The PDO would detect the battens... But yes, it strikes me that wires would work
I'm sure that there's a standard builder's trick for this - which someone more knowledgeable than me can share...

 

[z102]

You could fix (with a bit of tape) a galvanised cheap wire (or copper) onto the ducting. Galvanised wire because it would'nt rust even in the long term. Usually a drawing (or photo)is sufficient, but sticking to the standards plus a photo is even better. "The standards" are the ideal distances to openings, floors, corners, the right angles etc...buy a book about the issue.
Once the ducts are filled with a cable they're detectable anyhow, as the Simp said so already.
More important are burried junction boxes. For these they use (on the continent at least) lids that come with a red, thin, half stiff polyethylene thread sticking out.The plasterer can overplaster them but the thread comes jumping back through the wet plaster, sticking out of the wall/plaster waiting for the electrician.