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I googled "floor framing" and got lots of results. The following (img_1) is the simpler one.

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According to the anotations in the image, there are 7 joists, 2 bearers, 6 stumps, right?

Consider the following image (img_2), is this another floor framing system?

enter image description here

what is the difference between joist splices and floor joists?

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Joists are just that, members that carry the sub-flooring or ceiling. A joist splicing occurs where the length of span of the floor is longer than the joists are capable of supporting so a beam or "girder" is placed under the ends of the joists. Joists from either side of the support beam overhang the beam some and overlap with their companion coming from the other side. This picture shows the concept:

enter image description here

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  • Thanks for your answer. Is my understanding (there are 7 joists, 2 bearers, 6 stumps) about img_1 right?
    – zghqh
    Jan 30, 2020 at 10:31
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    @zghqh - Yeah. Seems like we both count up the items in the diagram the same.
    – Michael Karas ♦
    Jan 30, 2020 at 10:35
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    Thank you! Your example get me a better understanding. There are 4 joists in total in your example, 2 joists and their splicing, is my understanding right?
    – zghqh
    Jan 30, 2020 at 10:45
  • @zghqh the "splice" is the area of overlap between the two joists that meet over the girder. Yes, in this image, there are 4 joists and 2 splices. I would, however, refer to each spliced pair as a joist. Yes, they're offset, but they more-or-less work together as one.
    – FreeMan
    Jan 30, 2020 at 14:24

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