If01-02-Solid Timber Joists
Internal Timber Floors
If01
Product: Acoustic Joist Roll
Description: Glass wool insulation fitted
between timber joists
If02
Product: Rocksilk Flexible Slab
Description: Rock mineral wool insulation
fitted between timber joists
Advantages
- Acoustic Joist Roll/Rocksilk Flexible Slab provides improved
acoustic performance with no increase in floor depth
- Minimal increase in weight of floor
- Acoustic Joist Roll/Rocksilk Flexible Slab friction fits
between joists
- The floor system offers a high level of thermal insulation
stopping heat flow between storeys
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Products
Acoustic Joist Roll is a flexible,
resilient, roll of glass mineral wool.
Rocksilk Flexible Slab is a flexible stone mineral
wool slab designed for friction fitting.
Typical construction
Timber or metal joisted floor with 12.5mm plasterboard ceiling
and 100mm Acoustic Joist Roll or 100mm Rocksilk Flexible Slab
between the joists. Floor deck to be timber or wood based board
with a minimum mass of 15 kg/m2, e.g. 22mm
chipboard.
Performance
Acoustic performance
The construction complies with internal floor type C in Approved
Document E2.
Fire performance
Acoustic Joist Roll and Rocksilk Flexible Slab are classified as
Euroclass A1 to BS EN ISO 13501-1.
Density
- Acoustic Joist Roll has a density of 10
kg/m3
- Rocksilk Flexible Slab has a density in excess of 10
kg/m3
| Typical specification |
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Acoustic Joist Roll*/Rocksilk Flexible Slab*, 100mm thick, to be
placed between the floor joists. (*Delete as appropriate) The
ceiling and floor deck to be as specified by the designer.
Alternatively, consult the National Building Specifications
(NBS) based on Standard Version P10/240. It contains a set of
proprietary clauses, which are edited versions written by Knauf
Insulation.
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| If02 is an alternative solution to If01. It replaces Acoustic
Joist Roll with Rocksilk Flexible Slab. It has the benefit of being
supplied in slab format and may be easier to install than Acoustic
Joist Roll. If02 |