Boiler vertical flue

330d

My boiler is in my loft and therefore has a vertical flue that exits through the house tiled roof.

I have noticed I can see some daylight around the flue where it exits the roof. I presume this isn't right? Surely it should be a tight fitting around the tiles?

Bendy_House

Do you mean daylight in a 'circle' immediately around the flue pipe? If so, that's clearly wrong, and I presume the rubber gasket which usually forms a seal there is perished or torn (or missing...)

If you mean that you can see daylight at a low angle between the slates/tiles around where the flue exits, that might be ok provided you are seeing that gap in the downwards direction, as you would, say, between 2 slates that lie on top of one another, but have a natural little air gap there.

330d

It's the second scanerio you mention. But I wouldn't say at a low angle as I can see it during climbing the ladder into the loft.

I don't think it's letting in water but it's making my loft cold which is a concern as I use it for storage plus the hot water cylinder is up there.

Looking at photos on Google, it appears the aluminium flashing around the flue is not moulded around the tile.

Bendy_House

You have a draughty loft? It's cold up there?!

You lucky lucky b.....

Ahem. That's what a loft should be like - cold and draughty - and hence dry.

If the flashing is overlapping the tiles below it well enough, and the usual proof is no water coming in, then don't worry about it.

Oh, and your loft eaves should also be draughty, even if you cannot see any actual gaps. That's how it should be.