Crack in harling

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Hi. Here's a picture taken after heavy rain. The harling is obviously cracked but I don't know what to make of the wet spot on the brown harling. Above it is a tiny vent(?) of plastic. How serious a problem do I have here d'you think? Thank you.
 

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The "brown harling" could have been the original top coat or it could be the first coat with the later dash rendered on top?
Whatever, the brown harling should have stopped before touching the ground - it needs cutting back from ground contact up to just above the DPC.
Does the heavy dash top coat have a Bell Cast or a stop-bead fitted?
Metal beads can rust & swell - plastic bell casts or beads are best.
Its possible that the "vent" is connected to any beading?

I dont think you have anything serious going on.
 
Render can be classified as either cracked or, if not, it's about to crack.

It's absolutely normal. It's a thin layer of brittle eggshell around a building that expands, contracts and moves a bit now and then.

Worry about it if a lump falls off.
 
The crack may be cracked wall beneath

Rain is running down the frame, into the crack and creating the damp around it.

The vent appears to be a weep vent from a cavity. Are there others along the base of the wall? If so, possibly a cavity tray expelling water from the cavity - the rain that's getting in via the crack?
 
Thank you all. Aye, woody, there are airbricks and these wee vent things a yard or so apart along the length of the house. The vent at the end of the crack has some kind of gunge around it if that's a clue to anything...
 

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I'm guessing they may have put a bead of clear silicone over the weep vent while pebbledashing, to protect it from getting filled or cracked, then peeled it off after, leaving a smear around it.

As the crack is from a corner of the window it probably is a crack in the brick or block below but is just horizontal shrinkage so nothing to worry about. Do you have similar on the inside around doors or windows? Our place has plenty, it's not falling down.

Unrelated, but has your airbrick been sealed up? Was a suspended floor replaced with concrete?
 
Thanks, Ivor. Inside is fine. Most of the airbricks look to have been partially sealed so they're still functional. No floors have been replaced with concrete. I'll have someone come and look. Thanks again.
 
If you have weep vents you have a cavity tray, which would typically be due to design - eg timber frame, damp prevention or a radon barrier.

Any significant weeping from a vent whilst normal is not common. It's a sign of excess water getting into the cavity.
 

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