State which distance is being measured
Clear span, distance between support centerlines and overall member length describe different dimensions. A product table or calculation uses a particular convention. Keep that convention with the number when comparing beams or panels. Measuring a wide viewing opening does not, by itself, provide every dimension needed to select a supporting member.
Span does not determine capacity alone
Profile, material, orientation, support conditions, connections and loads also matter. A member used successfully over one opening is not automatically suitable for another opening of equal width. Ask the project team to identify the relevant design or product documentation. Avoid selecting a beam from a simple universal span rule without the rest of the assembly.
A practical homeowner example
Two proposed picture-window openings have the same visible width but different roof arrangements. The homeowner asks for the complete design basis instead of assuming they require identical beams.
This is an illustrative planning scenario, not a report of a particular West Coast Screening project.
Questions to bring to an estimate
- Keep the document title, applicable version and project identification together.
- Ask who determines the criteria or approval basis for this particular scope.
- Retain the governing documents and written resolutions of changes.
Frequently asked question
Is a beam's length the same as its span?
Not necessarily. Length includes the whole member, while span relates to its supports under the stated design convention.
Related glossary terms
For the broader vocabulary, return to the pool cage and screen-enclosure glossary.
Authority sources and further reading
Use these sources within their scope. Manufacturer information applies to the identified product; research and general guidance do not establish a rating or an approved repair for an individual project.