Jul 19, 2020 9:18 pm
We are builing in a zone deemed "severe" with regards to coastal corrosion.
We are within 200m or breaking surf.
According to NCC 126.96.36.199 , and if im not woring, structural steel needs to be coated to the following table(please see attached).
Our steelwork came out to site fabricated in zincalume steel , welds not even painted - had to really push them to paint and it appears they sent a labourer out with a can of spray paint to do the job, only on the welds. Before the walls even go on rust is leaking out and down the steelwork (no doubt later out the bottom of the wall and all over the outdoor tiles).
Im unsure if these locations the steel is located is deemed internal or external. But at the very least we are " severe - internal".
Regardless it seems like they need to be finished to a minimum standard, as per the below attached table.
They are not done to this standard.
, nonetheless, even internal for "severe" coastal locations requires a minimum corrosion protection to the steel work.
Re: structural steel and corrosion4
Jul 19, 2020 11:55 pm
is that a welded bracing panel? It will probably be ok once enclosed. Can you go there and throw some primer on it for piece of mind?
yeah i put some cold gal on it but NCC specifies more than that.
job was already stopped for a month when all the big I beams turned up painted with a single layer of red oxide paint when it was supposed to be hot dip galvanised (was exterior stuff). Then they told me it was hot dipped but painted over. I scraped it back and found this wasn't the case. So things totally held up for a month now back on track - and now this again.
Re: structural steel and corrosion5
Jul 20, 2020 12:27 am
Its definitely wrong, I would put something in writing to them ASAP that it doesn't comply as per the National Construction Code
yep already did that once, sent them the table as i attached in the orignal post and all of the bigger structural steel was pulled out (after initially refusing before i sent the NCC table) and sent for dipping. but they said they werent going to do the welded z bracings as they were going to paint in accordance.
the annoying thing is, when they did this (sent bigger steel beams for dipping), it stopped the job for a month, all the structural timber (tillings smart beams) and battens and ply bracing just sat on the ground for a month and got rained on and then covered in more salt for a month. all the smart beams were just left laying on their sides uncovered. i had to go to site and cover them all up myself. sent them an email about it with photos but no response.
now the Z bracings i mentioned in this post are built in dunno how they would get them out to do them properly (if that is what is required).
dunno why wen they sent the other 4 tonne of steel back for dipping they just didnt do these z bracing supports too.
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