Chasing some info regarding concreting up against a fence - our concreter has suggested we place blueboard against the fence so the concrete can be poured directly up to it without damaging the fence (or for future replacements etc).
But this being the case - what happens to the gap behind the blueboard in between the fence? Wont this just fill up with water? And cause rust and other types of damage to the fence?
Ive attached a couple of pics for reference, can someone please suggest an option to do with the water, or if there are any other ideas instead of blueboard?
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Cheers