Definition & Meaning of Level Span Chart
A level span chart is a crucial tool used in construction and engineering to determine the appropriate size and spacing of beams, joists, or other structural elements. It provides guidelines based on the load requirements of a particular structure, ensuring safety and compliance with building codes. The chart typically includes various dimensions and load capacities, allowing builders to select the right materials for their projects.
For example, an LVL (laminated veneer lumber) span chart may list different spans for beams based on the load they need to support. This information is vital for architects and builders to design safe and effective structures.
How to Use the Level Span Chart
Using a level span chart involves several steps to ensure accurate application. First, identify the type of load your structure will support, whether it is a live load (like people and furniture) or a dead load (the weight of the structure itself). Next, measure the span between supports, which is the distance the beam will cover without additional support.
Once you have this information, locate the appropriate section of the chart that corresponds to your beam type and load requirements. For instance, if using a double LVL beam for a roof, find the row that matches the span and live load to determine the minimum beam size required.
How to Obtain the Level Span Chart
Level span charts can be obtained from various sources, including construction codes, engineering handbooks, and manufacturers of structural materials. Many lumber suppliers provide these charts as part of their product documentation. Additionally, online resources and software tools can offer digital versions of these charts for easy access.
For example, a local lumber yard may have printed copies available, or you can find a PDF version on a manufacturer's website. Ensure that the chart you use is up-to-date and complies with local building codes.
How to Fill Out the Level Span Chart
Filling out a level span chart typically involves entering specific project details such as the type of material, span length, and load requirements. Start by selecting the correct chart based on the material you are using, such as LVL or Microlam. Next, input the span length and the anticipated loads.
For example, if you are using a 2x12 LVL beam for a residential project, you would find the corresponding row for that beam size, then note the maximum allowable span for the specified load. This process ensures that your selections meet safety standards.
Examples of Using the Level Span Chart
Consider a scenario where a homeowner is building a deck. The builder would first determine the total weight the deck must support, including furniture and occupants. Using the level span chart, they can select the appropriate size of LVL beams based on the calculated load and the distance between support posts.
Another example involves constructing a roof. A contractor might refer to the level span chart to decide on the size of beams needed to support the weight of roofing materials and snow load. This ensures that the structure can withstand environmental stresses.
Key Elements of the Level Span Chart
Several key elements are essential for understanding a level span chart. These include:
- Span Length: The distance between supports that the beam will cover.
- Load Types: Differentiation between live loads and dead loads.
- Beam Size: The dimensions of the beam, such as thickness and width.
- Material Type: The specific type of lumber or engineered wood being used.
Each of these elements plays a critical role in ensuring that the structure is safe and meets building regulations.
Who Typically Uses the Level Span Chart
Level span charts are primarily used by construction professionals, including architects, engineers, and builders. They are also valuable for DIY homeowners undertaking their own construction projects. Understanding how to read and apply the chart can help ensure that structures are built safely and effectively.
For instance, a contractor may use the chart to determine the correct beam size for a new home, while a homeowner might consult it when building a shed or deck.
Important Terms Related to Level Span Chart
Several important terms are associated with level span charts that can enhance understanding:
- LVL: Laminated veneer lumber, a type of engineered wood.
- Microlam: A brand of engineered wood similar to LVL.
- Span: The distance between two supports.
- Load Capacity: The maximum weight a beam can support.
Familiarity with these terms can help users effectively interpret and utilize the level span chart.
Legal Use of the Level Span Chart
Legal use of a level span chart is essential for compliance with local building codes and regulations. Builders must ensure that the spans and load capacities outlined in the chart meet the requirements set forth by local authorities. Failure to adhere to these guidelines can result in penalties or unsafe structures.
For example, a contractor may need to submit their plans, including the level span chart data, for approval before beginning construction. This process ensures that all safety standards are met.
