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  1. Nitsugua

    rare bolt head mark

    Hi, here's a picture of a broken cap scew involved in an accident. We will call it the "F" bolt. Other bolts around are SS ASTM F593. Unfortunately, this only one does not have a stadard mark and nobody around know about it. Many manufacturer's charts have been viewed and no clue appears...
  2. Nitsugua

    BENT BAR IDENTIFICATION

    We are curently evaluating a 1958 concrete floor. So far, I'm not old anough to understand original drawings. My question is about bent rebars and there identification. Even with a hook or any othe king of bendig, there is a code I dont understand. For exemple, bottom bars (positive...
  3. Nitsugua

    fire rating of ceilling

    I'm investigating on a fire in a two story retirement house. The attic was the main way for the fire to communicate to other locations in the same building, starting from an individual room at the second floor. Canadian Construction Code indicate that, for that particular room, a 30 minutes...

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