FONODAN BJ – Acoustic Insulation for Downpipes
FONODAN BJ is a two layer product made of a self-adhesive high density bitumen membrane thermally bonded to a cross-linked polyethylene. FONODAN BJ acoustically works providing the acoustic mass of the tube body and removing resonant frequencies.
Application
- Increases insulation in the noisiest area of the downpipe, such as junctions and elbows.
- Reduces noise from siphon pipes and sagging pipes inside false ceilings.
- Specially designed to minimise noise from drainage pipes in all types of buildings.
Advantages & Benefits
- Double reinforcement at bends and junctions increases acoustic performance.
- Easy and quick to install.
- High resistance to tearing.
- Prevents mould growth in the insulation.
- Insertion loss IL>17 dBA (complete system).
- Low thickness, easily adapts to the downpipe.
Instruction for Use
Preliminary operations
- For any self-adhesive product to work, the surface must be dry and clean. Therefore, once the downpipe has been installed, a damp cloth should be wiped over the surface and left to dry before applying the product.
- The product should be cut on a clean surface to prevent the polyethylene from dusting.
- The application temperature is more than 10º C, therefore, in winter it must be taken into account that the product has a lot of inertia and it takes time to reach the application temperature.
Laying FONODAN BJ
- Cut the roll of FONODAN BJ to the length of the downpipe or in sections between 80 cm and 1 ml for the convenience of the applicator.
- Separate the release film and present it to the downpipe.
- Press the FONODAN BJ, first in the centre, then on one side until it is perfectly adhered and finally on the other side so that it is at least 3 cm above the glued side.
- When laying the next section, make sure that there is a 3 cm overlap over the already installed section.
- Rework the gluing at the overlap.
- For safety and durability reasons, we recommend placing an electrician’s flange approximately every 50 cm, making it coincide with the overlaps of each section.
- The elbow and the junction will then be reinforced with Fonodan 130 tape, following the same criteria.
- The siphon pipe and the drainage pipes that are hanging down through the false ceiling will be lined with Fonodan 70 strip.
- Finally, the downpipe is fastened to the structure by means of steel flanges with neoprene incorporated.
Size
- Length (m): 10
- Width (m): 0.42
- Colour: Yellow
- Thickness (mm): 4
- Thickness (mm) ~ Standard: EN 1923
- Surface (m²): 4.2
- Product code: 610207
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