Acoustic Plaster General Installation
In order to guarantee the service life and surface quality of a BASWA Phon acoustic
plaster system and to prevent long-term damage, the substrate to which the system is
bonded must first be checked for five points.
In addition, the following requirements still have to be checked:
• Substrate is free of sintered layers and switch release agents
• The substrate is dust-free, free of cracks, free of impurities and harmful
efflorescence.
• Substrate is dry (residual moisture 3 % by mass) and non-water repellent
1. Adapt the substrate to the required final shape
Flat, parallel or exactly curved: With the adhesive and coating masses as well as
the grinding of the acoustic panels, unevenness of max. 4 mm can be levelled out.
Increased requirements for flatness (Q3), dimensional tolerances and dimensional
accuracy must be met with the substrate.
Prior to use, treat strong formwork offsets and burrs on concrete surfaces (>3 mm)
(peel off, partially level or apply full surface levelling layer). Please note: The levelling
layer must dry completely before the acoustic panels are bonded (lead time of at
least one to two weeks/ or one day drying time per millimeter of levelling plaster).
2. The substrate must be stable
No cracking or movement:
Taking into account the specific properties of the ceiling or wall surface such
as the shape of the structure, material expansion, possible subsidence and/or
deformation of the shell, surfaces can be designed up to the maximum size of
the respective substructure.
The guidelines of the product suppliers of the selected substructure must be
strictly observed. In order to prevent the formation of cracks, expansion joints
caused by design must be incorporated into the BASWA acoustic systems. No
warranty for non-mineral substrates such as OSB, MDF, metal plates, etc.
Formation of expansion or separation joints: For large areas, depending on the
specific properties of the building structure or the construction process, the
formation of separation joints is necessary. The following principle shows how
air circulation to the cavity can be avoided, thus excluding partial contamination.
3. Adhesive tensile strength >25 kg / m2
The substrate to be coated must have an adhesive tensile strength of at least
250 N / m2. If this is not guaranteed, measures must be taken to achieve this
adhesive tensile strength. For suspended ceilings, the spacing of the suspended
structure must be selected so that the entire ceiling structure can support the
additional load of the BASWA acoustic system. Gypsum plasterboards should
preferably be pre-treated with a deep primer due to their tensile strength.
Additional mechanical fastening
For existing ceilings (plaster, paint), the adhesive tensile strength and moisture
sensitivity must be checked beforehand. If the adhesive tensile strength is less than
250 / m2, the defective substrate must be removed accordingly or strengthened
by means of a depth substrate matched to the existing coating.
Additional mechanical fastening of the bonded acoustic panels with the BASWA
fastening rod can only have a supporting effect to prevent third-party damage.
4. The substrate must be airtight
In the case of suspended ceilings, all panel joints must be filled and reinforced in
such a way that a level, stable and closed substrate is created (airtightness!). All
installation penetrations and gaps to connections to components must be sealed
airtight with vapor barrier tape before the acoustic panels are bonded. These seals
prevent air circulation through the open-pore acoustic system (prevention of partial
dust deposits in the final coating). In order to ensure airtightness over the entire
service life of the installation, an adhesive tape should be selected which ensures a
corresponding long-term adhesion (e.g. vapor barrier adhesive tape).
Ageing process with air flows
In the event of leaking connections to suspended surfaces, the air circulates through
the open-pored acoustic system. The dust carried along is filtered in the final coa-
ting and leads to strong partial discolorations over the course of the service life.
5. Calculation and prevention of the dew point
When planning a BASWA Phon acoustic system adjacent to the outer shell of the
building, the dew point must be calculated and checked in advance by a specialist
planner (e.g. at the top floor / outside walls / balcony, terrace undersides / cold
rooms, etc.).
If the dew point is within the BASWA acoustic system, the surface will change
color irregularly within a very short time due to condensation (increased dust
adhesion to the moist coating surface).
Solid ceilings
Due to the minimal loss of room height, combined with excellent acoustic absorp-
tion, the BASWA Phon acoustic systems have proven themselves for use directly
on concrete or existing substrates.
Suspended ceilings
In order to prevent partial contamination of the surface, the system requires a
stable, absolutely airtight ceiling substructure. Commercially available suspension
systems made of metal rails can be used for the substructure. Wooden const-
ructions are not recommended for this purpose. These may form cracks due to
long-term deformation.
A 12.5 mm thick plasterboard or gypsum fiberboard ceiling is suitable as a
suspended base for the BASWA Phon system structure. Gypsum plasterboards
should preferably be pre-treated with a deep primer due to their tensile strength.
In damp rooms, such as swimming pools, wellness areas and adjacent areas, the
substructure must be selected on the basis of structural-physical investigations.
All components of the suspension structure must be corrosion-resistant. Cement
fiber boards or water-repellent dry construction boards, cementitious levelling
plasters intended for this application must be used. The BASWA Phon acoustic
panels must be bonded with BASWA fix C cement adhesive. See application data
sheet for installation of BASWA acoustic systems in damp rooms.
Curved surfaces
In order to produce curved surfaces, the substrate must already correspond to
the final shape.
Acoustic panels are specially scored on the back surface and are adapted to the
substrate on site, glued and grouted. After complete drying, the surface is sanded
to the desired final shape. In the BASWA Phon Classic System (two-layer system),
curved surfaces are always complete with a base and final layer.
For radii > 20 m, convex and concave surfaces can also be planned with a single-
layer system, provided they are not exposed to stray light. Smoothed surfaces are
possible from radii > = 0.5 meters.
Radii < 0.5 meters, e.g. for hollow grooves, are extremely difficult to smooth and
require special tools. We will be happy to advise you on the planning of appropriate
technical details.
BASWA Acoustic Plaster Colors
The choice of colours for the BASWA coating compounds is almost unlimited. The
coating compounds can be coloured in almost any desired shade. After delivery of
a color reference, a color sample is created by BASWA. This must be confirmed
by the architect or client.
In order to achieve colored surfaces, the BASWA coating dimensions are dyed at
the factory to order. The colour formulations are determined individually for each
new colour in the BASWA acoustic AG laboratory; due to the special properties of
the porous surfaces, each color formulation is compared by eye with the original
pattern.
The pigment preparations are mixed into the coating masses without further
addition of additives. The coloured products are then applied on site.
The BASWA Colours colour chart “BC” provides an overview of the colours that have
been most in demand in the past ten years. As usual in interior design, broken and
light colors predominate. With the BASWA acoustic Colors color chart, you can
compile and compare color tones.
Furthermore, all desired colors can be mixed on order according to references
of common color cards or physical samples. Accumulated sample cost will be
applied as a credit towards your final material order cost.
The products are made from natural marble sand. Untreated natural products are
always subject to minimal color variations and can easily influence the basic tone
of the color. The standard white of the BASWA coating dimensions corresponds
approximately to NCS S 0500-N.
Due to the porosity of the surface, finished BASWA Phon surfaces can have very
different effects depending on the incidence of light. Similar to other mineral
systems, a slight cloud formation cannot be excluded with coloured surfaces.
Light reflection of BASWA
Light reflection on surfaces in rooms should be as high as possible, because poor
lighting conditions can lead to fatigue, headaches, poor eyesight and noticeably
reduced productivity at the workplace.
The BASWA acoustic coatings with white surface have an optimal light reflection
between 75 -79%. This enables a high level of light diffusion and thus an even
distribution of light, which can considerably increase well-being. Artificial and
natural light is also used efficiently and can also contribute to energy savings.
The following values refer to measurements carried out according to DIN EN ISO
11664-4 according to CIELAB system.
Surface structures and effects
Surface structures and effects
The smooth finish of the BASWA Phon acoustic systems with their fine, smooth surface
texture supports the design of modern, timeless architecture. Using special installation
techniques, various plaster structures can be imitated, which are often used in the
acoustic renovation of historic buildings.
• Spray application
• Brush Texturing
• Modeling the trowel
Sparkling effects with BASWA Shine
The BASWA Shine surface refinement gives the surface a glittering effect without
significantly impairing its acoustic performance. The mica dispersion BASWA
Shine is used for the subsequent finishing of BASWA acoustic surfaces. It must
be directly illuminated with the help of the lighting concept in order to achieve
the glitter effect.
On request, Quiet Interiors develop special surface effects in cooperation
with customers.