Pyrotek Soundlag
Soundlag 8025C 29 mm, 1350 mm x 3 m roll (4.05 m²)
$211.00
Sale price
$211.00
Regular price
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Pyrotek Soundlag
$211.00
Sale price
$211.00
Regular price
GST inclusive
Opening Offer: 5% off orders over $1,000, 7% over $2,500, 10% over $4,000. Ends 30 November. Offer details
How many do you need?
Measure the wall, ceiling or roof area and take about 10% off for studs, joists and purlins.
You need
Which covers
Total
Dispatch: Most orders are processed the same day. Metro delivery: Usually 1–3 business days. We do our best to get most items out on the next business day.
Delivery to VIC and NSW: $55 in metro Melbourne and metro Sydney, $99 in the outer ring around both cities, $149 anywhere else in the two states · Local pickup from Epping, VIC by arrangement · Shipping details
Pyrotek Soundlag is a composite acoustic lagging: a reinforced foil faced mass loaded vinyl barrier bonded to a blue convoluted foam decoupling layer. It wraps wastewater pipes, valves, fan housings and ductwork to cut breakout noise. Two grades, both in 1350 mm x 3 m rolls of 4.05 m².
Which grade
Soundlag 4525C is 25 mm thick with a 5 kg/m² barrier. Pyrotek offer it for NCC F5.6 compliance, and their results show it suitable with 10 mm or thicker plasterboard in a habitable room and without a ceiling in a non-habitable room. Insertion loss is 25 dB(A) single layer, 29 dB(A) doubled. The 8000 series grade, Soundlag 8025C, is 29 mm with a heavier 8 kg/m² barrier and is listed for duct lagging, HVAC, fan housings, heat pumps and waste and stormwater pipes.
What the ratings cover
Rw figures in the table belong to the bare barrier layer, not a lagged pipe, and the 8 kg/m² result was tested on Pyrotek's Wavebar. The Class 0 rating covers the foil facing only. Pyrotek's NCC results point to test reports, so check the tested set-up before relying on them.
On site
Lag only after pressure testing, on a clean dry pipe. Pyrotek size the wrap as π x (OD + 2 x thickness) x 1.03 to 1.1, allowing 20% compression on the convoluted foam. Cut from the foil faced barrier side. Overlap every join and seal it with Tape ALR or equivalent, because the smallest gap at a joint loses performance. Full figures are in the table below.
Technical data
Pyrotek Soundlag 4525C technical data sheet (PDF)Sizes stocked
| Grade | Thickness | Barrier weight | Roll size | Coverage | Product code |
|---|---|---|---|---|---|
| Soundlag 8025C | 29 mm | 8 kg/m² | 1350 mm x 3 m | 4.05 m² | 17054058-2 |
| Soundlag 4525C | 25 mm | 5 kg/m² | 1350 mm x 3 m | 4.05 m² | 17054073-7 |
Acoustic
| Insertion loss, 4525C single layer | 25 dB(A) (report ATF750B) |
|---|---|
| Insertion loss, 4525C double layer | 29 dB(A) (report nss22253b) |
| NCC BCA Volume 1 F5.6, habitable room, 4525C | Suitable with ≥10 mm plasterboard (report Lt 002 20161709) |
| NCC BCA Volume 1 F5.6, non-habitable room, 4525C | Suitable without ceiling (report Lt 01 r02 2010167) |
| Rw+Ctr, 4525C | Meets Rw+Ctr 40 for habitable and Rw+Ctr 25 for non-habitable rooms (Pyrotek brochure); the habitable result is with ≥10 mm plasterboard |
| AAAC rating, 4525C | 6 Star Rating (report PKA-A186) |
| Transmission loss, 4525C barrier layer only | Rw 28, STC 28 |
| Transmission loss, 8 kg/m² barrier layer only | Rw 31, STC 31 (tested as Wavebar, report 264a) |
Rw belongs to the bare barrier layer, not a lagged pipe, and Pyrotek's NCC results point to test reports, so check the tested set-up.
Fire
| AS/NZS 1530.3, 8025C | 0, 0, 0, 5 (report 20-004854) |
|---|---|
| AS/NZS 1530.3, 4525C | 0, 0, 0, 1 (report 16-004295) |
| ISO 5660 fire hazard properties, 4525C | Group 3 (report FH5997-01-3) |
| Foil facing, both grades | Class 0 (BS 476 Part 6 and Part 7) |
The four AS/NZS 1530.3 figures are ignitability, flame propagation, heat release and smoke release, and Class 0 covers the foil facing only.
Thermal and temperature
| Thermal conductivity, both grades | 0.0476 W/mK (ASTM C518) |
|---|---|
| Operating temperature, 4525C | -40 to 100 °C continuous, -40 to 120 °C intermittent |
Soundlag is sold for noise control, so treat the conductivity as a reference figure rather than an insulation rating.
Material and handling
| Construction | Reinforced foil faced mass loaded vinyl (MLV) barrier bonded to a decoupling layer |
|---|---|
| Decoupling layer, both grades | Blue convoluted foam |
| Roll weight, 8025C | 34 kg |
| Tolerances, 8025C | Length ±1%, width -0/+5 mm, thickness ±3 mm, weight ±10% |
| Tolerances, 4525C | Length ±1%, width -0/+5 mm, thickness ±5 mm, weight ±10% |
| Jointing tape | Tape ALR or equivalent |
Compliance and warranty
| VOC, 4525C | TVOC emissions below the Green Star threshold of 0.5 mg/m²/hr (ASTM D5116) |
|---|---|
| Warranty | Ten years |
| Origin | Australian made |
Fitting notes
Lag the pipe only after pressure testing is complete, with the surface clean and dry. Work out the wrap width as π x (pipe outside diameter + 2 x lagging thickness) x 1.03 to 1.1 for the overlap, allowing 20% compression on the convoluted foam thickness. Cut from the foil faced barrier side with a knife or scissors. Overlap every join and seal it with Tape ALR or an equivalent reinforced aluminium tape. Stripping the foam from the overlap edge gives a better acoustic seal. Coverage must be continuous, because the smallest gap at a joint loses performance.
Figures are taken from the Pyrotek technical data sheets for Soundlag 4525C (411IP, Aug-26-EN-411IP) and the Soundlag 8000 Series (418IP, Apr-25-EN-418IP), the Pyrotek Soundlag brochure (May 2026) and the Soundlag pipe lagging installation guide (401-1IG, August 2019). The 4525C data sheet is linked above. Pyrotek can change specifications without notice, so check the current sheet before specifying on a job.
Common questions
Which grade do I need for pipes running past bedrooms?
Soundlag 4525C, because it is the grade Pyrotek publish NCC BCA Volume 1 F5.6 results for. Those results show it suitable in a habitable room with 10 mm or thicker plasterboard, and without a ceiling in a non-habitable room. Check the referenced report for the tested set-up.
What is the difference between 8025C and 4525C?
Soundlag 8025C is 29 mm thick with an 8 kg/m² barrier and is Pyrotek's 8000 series grade for duct lagging, HVAC, fan housings, heat pumps and waste and stormwater pipes. Soundlag 4525C is 25 mm thick with a 5 kg/m² barrier and carries Pyrotek's NCC F5.6 results. Both have a blue convoluted foam decoupling layer.
How much does one roll cover?
Each roll is 1350 mm x 3 m, which is 4.05 m². On pipework, size each wrap with Pyrotek's formula, π x (outside diameter + 2 x thickness) x 1.03 to 1.1, and allow 20% compression on the foam.
Is the Rw 31 figure for Soundlag 8025C?
No. Rw 31 is Pyrotek's result for an 8 kg/m² barrier layer on its own, tested as Wavebar, and Rw 28 is the 4525C barrier layer on its own. Neither figure is the rating of a lagged pipe.
Is Soundlag fire rated?
Both grades have a Class 0 foil facing to BS 476 Parts 6 and 7, which covers the facing rather than the whole composite. Under AS/NZS 1530.3, 4525C scores 0, 0, 0, 1 and 8025C scores 0, 0, 0, 5. Soundlag 4525C is also Group 3 under ISO 5660.
Can it be used on ductwork?
Yes. Pyrotek list duct lagging, HVAC and fan housings among the uses for the 8000 series, which includes 8025C, and publish a separate Soundlag HVAC and ducting installation guide.
Cannot see your question? Ask our team and we will get you an answer.
Answers use the Pyrotek technical data sheets for Soundlag 4525C (411IP) and the Soundlag 8000 Series (418IP), the Soundlag brochure (May 2026) and the Soundlag installation guides 401-1IG and 401-2IG.
