I'm running plastic pipe in the ceiling, and dropping down a short tail in copper prior to re-boarding and plastering. The tail will be about 6" - so not a huge amount of pipe between the blow torch and the plastic joint. Is this likely to end in tears? Should I use copper for the final section in the ceiling as well, so that I get more like
18" of pipe between blow torch and plastic, or am I wasting my time?
Can't you pre-assemble the copper bits and do all the blow-torching before connecting it to the plastic section?
Or have a compression joint between the plastic and the bit you need to solder? And, of course, undo it for the soldering process. Maybe 6" and precise location means this is not possible.
My reading of this is that you need to connect to the copper while it is connected to the plastic. I'd suggest one of the "copper" push fit fittings which, while a bit bulky, are much less conspicuous than a compression fitting or a plastic push fit.
If it was the "other way up" you would probably get away with it if the plastic pipe and the bottom of the copper was full of water, and your soldering was quick. But this way round, both conduction and convection are against you.
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