Problem inside my roof gable wall (now with better video)

stator

So I've drilled a hole in the gable end wall in my loft. I'm looking for the source of some water dribbling down and hitting my back door on the ground level. I've stuck a crappy endoscoping camera through the hole in the inside leaf wall of the gable end, and so what I see should be the outside leaf wall of the gable end. Both walls are poured concrete. Poking the camera straight in, all I see is a concrete wall on the other side of the cavity gap, as expected.
After twisting the camera to the left a bit, I start to see this mess:


*deleted crap videos, see further down for decent quality video


Any thoughts :eek:

stuart45

Is it a Laing easyform construction?

jk0

Could it be a bee or wasp nest?

teneighty

It's very difficult to tell but it looks like the concrete to the outer leaf has spalled and a large chunk of concrete has become detached and fallen in to the cavity. Are they exposed reinforcement bars you can see from about 2:30 onwards?

Hopefully I'm wrong as I cannot see how you could repair that.

stator

stuart45 wrote: »

Is it a Laing easyform construction?

Indeed it is

stuart45

I'm no expert with this type of construction, but I have heard that the steel reinforcement above and below the windows can rust causing the concrete to spall as suggested by teneighty.

I would guess that any repairs would require the defective parts removed and rebuilt in blockwork.

stator

This is the location of where I drilled the hole for the camera:

stator

teneighty wrote: »

It's very difficult to tell but it looks like the concrete to the outer leaf has spalled and a large chunk of concrete has become detached and fallen in to the cavity. Are they exposed reinforcement bars you can see from about 2:30 onwards?

Hopefully I'm wrong as I cannot see how you could repair that.

That's my worry. I'm not sure why there would be reinforcement bars in this part of the wall.

I had also wondered if it could be a wall tie, but it looks like it's 'inside' the wall.

The bit from 2:30 is the same as the whole video to be honest, Just trying to wriggle the camera around to get some idea of what I'm looking at, but failed



I've ordered a better camera off Amazon

stator

stuart45 wrote: »

I'm no expert with this type of construction, but I have heard that the steel reinforcement above and below the windows can rust causing the concrete to spall as suggested by teneighty.

I would guess that any repairs would require the defective parts removed and rebuilt in blockwork.

Yes but we aren't near any windows, so the location of any steel seems odd to me

stuart45

I think the steel goes around the building as a band, so it's not just over the windows.

EssexExile

http://www.collier-stevens.co.uk/surveyors-blog/2011/laing-easi-form-housing/