Corrosion on metal deck
Corrosion on metal deck
(OP)
In a recent site observation I noticed some rusting on the underside of an existing metal deck. The existing roof system is 5" concrete(overall thickness) over an unknown metal deck thickness. Our office is taking the stance that without proper testing of the deck it would need to be replaced. There is no way we can tell how the deck will perform in a loaded condition. I am seeing resistance from the contractor on replacing the deck. The contractor is wanting to grind the metal deck, prime, and paint. Grinding would reduce the properties of the deck and without qualified personnel, if they exist, to perform the proper grinding we are in jeopardy of ruining the deck further. It is my understanding the existing roof surface will be replaced thus reducing the risk of water infilltration. Does anyone know of a product that could be applied to the underside of the deck after is is cleaned to preserve it properties, and or make it stronger. I am thinking in similarities, in concrete rennovation fiber wrap can be used. Your information will be greatly appreciated.
RE: Corrosion on metal deck
if the corrosion is signifant and the metal is flaking off, you could recommend removing and replacing the section that is damaged. depends on how severe the corrosion is.
based on your statement that you don't know the deck thickness, this is an existing building? any structural drawings to know if the slab is reinforced? it may be possible the slab can span without relying on the deck. the deck may be considered a temporary formwork.
RE: Corrosion on metal deck
http://www.fyfeco.com/
RE: Corrosion on metal deck
In this existing building, the deck is reinforced with mesh. However I am hesitant to check if the slab itself can span the gaps. We all know that the mesh gets pushed down to the bottom of the deck most times, even if we specify that it gets chaired and has the appropriate cover. From a positive moment standpoint it is helpful but what if we do not have the cover beneath the mesh and hence the development. There realy is no way to know.
Thanks for the info archeng.
RE: Corrosion on metal deck
RE: Corrosion on metal deck
RE: Corrosion on metal deck
RE: Corrosion on metal deck