ISO 10848-2 — Laboratory measurement of flanking transmission of airborne and impact sound between adjoining rooms
Flanking is the reason a wall that tested at Rw 55 in a laboratory delivers far less on site: sound arrives through the floor, ceiling and adjoining structure rather than through the wall. This measurement quantifies that indirect path for a junction rather than for an element, which is what makes a laboratory number predictive of real building performance. Traceable, outside our accredited scope.
At a glance
- Standard
- ISO 10848-2
- Published by
- International Organization for Standardization
- Title
- Laboratory measurement of flanking transmission of airborne and impact sound between adjoining rooms
- Status at ALT
- Traceable — outside the accredited scope
Accreditation status
This standard sits outside ALT’s accredited scope. The measurement is made to the method with traceable reference equipment, and the report says so plainly — it does not carry the accreditation mark. If your specification, regulator or customer requires an accredited result, tell us before you book and we will say whether we can meet it.
Before you commit to this standard
Two things decide whether a result to this standard will be accepted: whether the measurement was made by a laboratory whose scope covers it, and whether the specimen and conditions matched what the standard actually requires. A number produced outside either of those is not wrong, but it is not evidence either.
If you are not certain which standard your specification calls for — and specifications frequently name a superseded edition, or name an ISO standard where the ASTM equivalent is what the market expects — send us the clause and we will tell you what it means in practice before you spend anything.
Standards usually specified alongside it
| Standard | What ALT does with it | Status |
|---|---|---|
| ASTM E90 Laboratory measurement of airborne sound transmission loss of building partitions and elements | Full-size partition transmission loss in the reverberation room pair, rated as STC to ASTM E413. | Traceable — not in accredited scope |
| ISO 10140-2 Laboratory measurement of sound insulation of building elements — Airborne sound insulation | The ISO route to the same result, rated as Rw to ISO 717-1. Choose this when your buyer specifies ISO or EN. | Traceable — not in accredited scope |
| ASTM E413 Classification for rating sound insulation | Converts the measured transmission loss curve into the single-number STC rating. | Traceable — not in accredited scope |
| ISO 717-1 Rating of sound insulation — Airborne sound insulation | Single-number rating Rw with spectrum adaptation terms C and Ctr. | Traceable — not in accredited scope |