Condensate pipe help needed please

jefaz07

PJ_queen said:

So my boiler is in the middle of the house and condensate pipe goes out onto flat roof. As my flat roof is rubberized I don’t want the slightly alkaline condensate pooling on the rubber so it goes along the wall and onto downpipe. This run is about 8 feet.

about once a year it freezes which is a pain as it switches boiler off and every year I tell my self to sort it and now I am trying to.

This pipe is 22mm diameter and as the hole to the inside is fairly low it doesn’t have much fall on it which again doesn’t help with freezing.

if I somehow change the pipe to 32 mm will this maybe cure the freezing? Failing that as I have an upstanding on the edge of my roof my other brill idea was to run the pipe sort of diagonally across the roof so the condensate falls directly into a downpipe which will make the fall a bit better. I have been to b and an and screw fix to find  a push fit connection which will do this diagonal 45  degree angle but they don’t do it. 

I admit to being very diy challenged but would welcome any suggestions. 

You will need a solvent 45 degree fitting which are readily available. The size is actually 21.5mm not 22. If, of course, it is actually overflow pipe. 

WIAWSNB

The use of what appears to be a push-fit union on that length, suggests the pipe could be normal 22mm plumbing pipe.

Regardless, I agree that making that run in larger waste pipe would be a good move. If it has a slight, continuous fall all along its length, chances are - with added insulation - it'll be fine.

But, if a steeper diagonal run can be made, avoiding the parapet height, then that should fully remove any risk. I'd still be tempted to do it in 35mm waste pipe, and insulate it, tobsuretobesure.