Technical knowledge · HUB · REV 2026-10-06
Technical library
The library answers “what is this?” and “when does it fail?”. A service page answers “what do we do on the project?”. One does not replace the other.
What this gate is
Each technical essay: definition, why it matters, principle, measurement, unit, design, application, limit, common mistake, example, neighbouring parameters, questions, sources.
A numeric example explains a formula. It is not your hall’s target. If your number matches it, coincidence is not approval.
What is published now
RT60
RT60
STI
STI
Isolation or treatment
Isolation or treatment
Sightline
Sightline
When to open this gate
Before writing a number into a specification
Before writing a number into a specification
When two contractors disagree on one word
When two contractors disagree on one word
Not instead of measurement
Not instead of measurement
How to read the subject
- 01
Start at the definition and stop at the limits section.
- 02
Open the calculator, if there is one, only to apply the formula.
- 03
Return to the service page for the scope of work.
- 04
Write in the brief what you will measure.
What this gate does not do
Copying the example
Copying the example
Mixing RT60 with STI
Mixing RT60 with STI
Quoting the label “good” with no method
Quoting the label “good” with no method
Questions designers and owners ask
Do the essays replace the standard?
Do the essays replace the standard?
Where is the glossary?
Where is the glossary?
Will the library grow?
Will the library grow?
Who reviews the text?
Who reviews the text?
In which language do I search?
In which language do I search?
Technical sources
- ISO 3382-1
ISO 3382-1
- IEC 60268-16
IEC 60268-16
- Sightline literature
Sightline literature
Last editorial review: 2026-10-06. Review means the text was checked, not that a project was measured.
Turn the question into a brief
A study starts from room volume, use, and existing condition, not from a product name. Fill the brief and copy it.
Project study form