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StructuralEng, Consultant

Category: Structural Engineering

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Experience: Structural Engineer

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I am looking into enlarging a 34" opening into a wider 72" double door a

Customer Question

Hello, I am looking into enlarging a 34" opening into a wider 72" double door and want to add an adequate lintel. Wall is masonry, made of two layers of brick with Lime mortar (150 year-old wall). There are two floors above, I calculated the total uniform load over the 72" opening to be about 10,000 to 12,000 pounds (about 5000 kg) for both brick layers. I am looking to add two steel lintels (ideally an angle since it is easier to install, otherwise a channel) for each layer of brick. Would be 8 foot long total, with 6 foot span. I am thinking of using a lintel 5 to 6 inches deep (high) and 3 to 3.5 inches wide (2 inches if a channel), with 5/16 to 3/8 thickness. Is that a reasonable approach? Thanks for you help.

While I suspect this is an automatically generated answer, please let me know what the questions are. I should add that the floor joists are not bearing on the wall to be opened, as they run parallel to it.

Sure! I estimate it to be about 22 feet at most, probably closer to 20 feet: 2 feet above the lintel before the next floor, then 9-10 feet for each of the remaining floors above. I can give a precise measure tomorrow if needed. I used 100-130pcf to calculate the uniform load of up to 12,000 lbs based on these 22 feet height over the lintel. I am curious if my reasoning was correct.