What Is a Floor Joist? Overview, Span, Size, and More
![What Is a Floor Joist? Overview, Span, Size, and More](https://www.thespruce.com/thmb/0MQHBwXD1tCBo-PWfDOHoEyjKT0=/4000x0/filters:no_upscale():max_bytes(150000):strip_icc()/SPR-floor-joist-spans-1821626-hero-76e829c7892144c9b673511ec275ad51_2-9aebdbd6d1944f36ad836e05dcc8dbfe.jpg)
Learn everything you need to know about floor joist spans. This guide discusses floor joist spans, along with sizing, span tables, and types of wood.
Can Joists be Trimmed to Create a Lowered Floor? - Fine Homebuilding
![](https://www.shedking.net/images/10x12-floor-layout2.jpg)
CC Spacing
![](https://images.finehomebuilding.com/app/uploads/2021/09/13160607/021302022-main.jpg)
The Science of Simple Spans - Fine Homebuilding
![](https://i.ytimg.com/vi/cMvbRjbBnz0/maxresdefault.jpg)
How To Calculate Construction Standard Lumber For Floor Joist Using Old Carpenter's Math Formula
![](https://contentgrid.homedepot-static.com/hdus/en_US/DTCCOMNEW/Articles/THHD-Pro-FloorJoistSpacing-Section4-Diagram-WF-3683001.png)
Floor Joist Spacing - The Home Depot
![](https://img.ehowcdn.com/-/cppd/137/225/fotolia_863300_XS.jpg)
Engineered Floor Joist Span Specifications
Load & Opening Charts — Trimjoist
![](http://www.the-house-plans-guide.com/images/structural/joist-span-calculator.jpg)
Floor Joist Span Tables—Calculator
![](https://dimensionsguide.s3.amazonaws.com/08-BUILDINGS/CONCRETE-FLOOR-SYSTEMS/CONCRETE-FLOOR-ONE-WAY-JOIST-SLAB/Dimensions-Buildings-Concrete-Floor-Systems-One-Way-Joist-Slab.jpg)
Concrete Floor - One-Way, Joist Slab Dimensions & Drawings
![](https://www.yumpu.com/en/image/facebook/12370319.jpg)
Seasoned Floor Joists - Timber.net.au
![](https://mtcopeland.com/wp-content/uploads/2021/10/Screen-Shot-2021-09-28-at-3.45.00-PM-1.png)
What Is a Joist? - MT Copeland
![](https://i.stack.imgur.com/KqhP2.gif)
bathroom - Adding more floor joists in a crawlspace. Originals are 5' OC and need more support - Home Improvement Stack Exchange
![](https://cdnassets.hw.net/8c/e1/b5af0fa14d5ab30fd90f24e2e16d/tmp6074-2etmp-tcm71-1470553.jpg)
How To Get the Bounce Out of Floors
![](https://clearcalcs-prod2-cms.s3.amazonaws.com/BLOG_floor_joist_overview_0_00d6abfa97.png)
A Practical Guide to Timber Floor Joist Design in Residential Construction
![](https://uploads-cdn.omnicalculator.com/images/floor_joist/16-inches_on-center_spacing.png?width=425&enlarge=0&format=jpeg)
Floor Joist Calculator