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Really yes, I wonderd if he was one of few that didn't air test or if it was the norm. Is the reasoning behind it as once the joints taped it may disguise a leak on the final tightness test?

He says he trusts his soldered joints

Well im.a plumber gas engineer I work with doesnt. But I no from my viper book. Studying nvq level 3 that you should.

Di most people air test gas pipes to 0.5 bar before tapeing and or concealing covered pipe work.

Yes

Thanks can it run say 2.5 meters in 22mm or do longer runs need doing in 32mm?

if running a 22mm condensate pipe internally inside is there a maximum distance were you need to take it up to 32mm?

Or is both as good?

Central Heating Pipework Layout by CAESAR32 posted 20 Mar 2016 at 9:16 PM would it be ok piped like that, or would it be best to tee off separately of the main run for each rad?

Will the central heating be ok heating off the main 22mm run and flowing in to the branch of a 15mm tee and splitting both ways with a rad to pick up off both legs of the tee?

Sound ok?

IMG_20160311_163628 by CAESAR32 posted 13 Mar 2016 at 8:31 PM Like that but a rad either side of the main run in the same joist section. Suppose I could drop down to a 15mm tee. Flowing in the branch of the tee and splitting off both ways.

Centrall Heating by CAESAR32 posted 13 Mar 2016 at 8:16 PMCentrall Heating by CAESAR32 posted 13 Mar 2016 at 8:16 PM this is the lay out I have

Will 15mm pipe be ok supplying a 1300 p plus and a 600 single rad. Or should I tee off the main run twice?

I am concerned as the rads on the solid walls are dropped in 10mm from 15mm supplying pipes above. Were as the one rad on the stud wall has 15mm pipe dropped down the stud wall and only going to 10mm on the elbow that exits the stud wall.

Were as the rest of the rads are on solid walls I have dropped 10mm so can be plaster over. This ok?

The first fix is totally in copper