Parapet Repairs - Best Techniques - Thermal Cracking ?

[rideforever]

Hi

2 years ago a crack along the roof line party wall was repaired with some filling and painting over the masonry with some waterproof membrane.

At the time I was wondering if this was a bodge job - after all why didn't they just redo the masonry ?

Now it has cracked open again causing much damage.

Why did this happen ? is it that the waterproof coating does not allow the wall to breathe, and so water trapped in the wall, expands destructively in cold weather ?

Is this membrane technique actually total rubbish ?

Any advice is appreciated ?

Untitled

• rideforever
• 4 Jan 2014
• 3

Untitled

• rideforever
• 4 Jan 2014
• 1

Untitled

• rideforever
• 4 Jan 2014
• 3

 

[Alastairreid]

If the render was knackered before he painted it he should have hacked it off and redone it.

Waste of time and money painting it.

Not a very good set up you have there between the valley, roof, and parapet! It will choke every time a pigeon takes a dump.