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  1. #1
    Join Date
    Sep 2005
    Location
    Orlando / Daytona, FL
    Posts
    143

    Default Steel tube in/on concrete for fabricated roof on block shed, corrosion?

    I'm building a 12x24 concrete block shed. I would like to build my own 6:12 pitch trusses from 2x3x14ga steel. I know this sounds like a lot of work vs wood but I want something simple that will last forever with no maintenance, so that means no exposed wood eves, i can keep these trusses completely sealed up inside the building and deck over with metal roofing. There is lots of moisture in florida that rots wood over time. The trusses will get concreted into the top lentil blocks of the walls when the cells are filled, and i will weld the trusses to the vertical rebar. Is there any potential for detrimental corrosion over time due to concrete's alkalinity. I know rebar holds up because it forms an oxide layer and is sealed inside the concrete, but this will only be partially sealed since it is at the top.

  2. #2
    Join Date
    Jul 2009
    Location
    Australia
    Posts
    1,031

    Default

    In Australia you would have to have council approval to do this kind of work. The council would require an engineer to design & certify said structure. Here we would cast a hot dipped galz threaded rod into the lintel blocks if the structure was more than 1 kilometre from the sea and a stainless steel threaded hook rod if closer than 1 kilometre.

    Ji
    Grip it and Rip it

  3. #3
    Join Date
    May 2013
    Location
    East Tenn
    Posts
    148

    Default Steel tube in/on concrete for fabricated roof on block shed, corrosion?

    I don think I would surround the truss with concrete. Even if it were galvanized. If I were doing a block wall with metal truss I would;
    A: make sure the top of the two load bearing walls were poured solid and rebar plus at least a 4" cap block as the last course.
    B:have two pieces of angle sandwiching the trusses together held in with tapcons. Two per angle.
    C: crib the shart outta it and metal roof.
    D: have at least a 16" overhang and make some cool soffit for it(keeps the critters out).

    Just my $.2! Hope it turns out well for ya whatever you decide to do. Keep us posted though.

  4. #4
    Join Date
    May 2013
    Location
    East Tenn
    Posts
    148

    Default Steel tube in/on concrete for fabricated roof on block shed, corrosion?

    Don't surround the metal with concrete. Just use some pieces of angle and tapcon them ontop of the last course of cap block. Walls should be filled with rebar and concrete on
    the load bearing walls at least if not all of them. Make sure you use vented soffit so to keep critters out and let the roof vent. Just my $.2.

  5. #5
    Join Date
    Oct 2006
    Location
    Illinois
    Posts
    596

    Default

    The block wall buildings I worked in have 1/2'' thick, 6'' X 8'' , plates for the trusses. The plates have a rebar ''J'' hook about 18 '' long welded to the plate. The plates are set at truss centers and rest on top of wall with the ''J'' hook mortared in.

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