Preventing corrosion of roof steel

[MrDetUdom]

We had a dodgy local builder build us a house just over a year ago. Although we definitely have no water leakage, there are already signs of corrosion in the roof steel. Is there anything that can be done to fix/prevent this? I have read in this forum about some red oxide paint, but many people claim it is useless. The builders should have done whatever is needed, but I have zero faith in their ability to get anything right, and it seems like something I need to get fixed up ASAP.

[VocalNeal]

Define "steel" roof. There are a few kinds.

 

Signs of corrosion?

 

You could simply send a painter up there with a spray gun?

Edited January 10, 2019 by VocalNeal

[bankruatsteve]

Corrosion on steel would be rust.  If it's not rust then maybe something else is depositing and probably not to worry.  If it is rust, you need to brush/sand it down and re-prime.  If it has never been primed... ouch.  The red-oxide should be OK but I prefer the grey colored primer.  

[eyecatcher]

You will find most steel only corrodes, rusts away if it is in direct contact with water on a regular basis.

Generally rain storms on a pile of steel every day will do nothing to harm them albeit some minor rusting.

If your steel is grade 2.0 or 2.4 or higher I wouldnt be concerned unless you have a hole in the roof, then you have a new set of problems.

 

I also moved away from red oxide to grey synthetic. I found some cheap enamels dont adhere to it and it peel off in strips quite quickly.

 

[Kwasaki]

Only a year old will not be serious but obviously needs attention.

Where is it rusting ?

What type of roof steel cover is it ?

Where was it bought ? 

 

There are so many alternatives for what can be done, the cheapest and simplest way has already been mentioned.   

As said you treat the material that is on the roof with a suitable product to remedy the situation. 

[CGW]

Doubtless never correctly painted in the first place! primer will not protect steel for very long - its porous, its meant to have a top coat to finish the job and seal the area, primer prepares the area for painting, here finishing the paint job with a topcoat is rarely done. ????