For projects in Bulgaria
School and classroom acoustics in Bulgaria
Hard floors, bare walls and long corridors that amplify everything. Children with developing language, and anyone with a hearing difficulty, lose more from a live classroom than adults do, which is why intelligibility is the target rather than quiet. School buildings are hard surfaced with long corridors and gymnasiums serving as halls.
- Classroom RT
- A number, set against room volume, achieved mostly at the ceiling.
- Corridor spill
- Long hard circulation feeds every room off it. Treating the corridor helps every classroom at once.
- Halls and gyms
- Dual use rooms carrying speech, music and sport, where durability decides the product.
- Quote
- From a plan and a section, within 48 hours
01 / The material
What this material is and where it earns its place in Bulgaria
Hard floors, bare walls and long corridors that amplify everything. Children with developing language, and anyone with a hearing difficulty, lose more from a live classroom than adults do, which is why intelligibility is the target rather than quiet.
School buildings are hard surfaced with long corridors and gymnasiums serving as halls.
Work reaching us from Bulgaria is mostly coastal and ski resorts, offices and service centres, panel block housing, schools, hospitals.
- Two seasons, two deadlines Coastal work finishes before summer and mountain work before winter. Real dates matter more than a marginally better price.
- Panel block housing Prefabricated concrete blocks pass speech and footfall between flats through thin, well connected elements. Surface treatment does nothing.
- Service centre floors Large rooms full of people on calls, where speech privacy rather than echo is the actual problem.
- Classroom RT A number, set against room volume, achieved mostly at the ceiling.
Full specification
Thickness, density, NRC by frequency, fire class, standard sizes and build-up detail for school acoustics are on the main product page. This page covers what that means for a project in Bulgaria.
02 / The build-up
The build-up, layer by layer
-
Layer 1
PET felt acoustic panels
A rigid non-woven panel pressed from 100% polyester fibre, a large part of it recycled. In Bulgaria, district heating and split units, with condensers on facades and in courtyards.
Direct to wall. Panel bonded or mechanically fixed flat to the substrate. Simplest, and the weakest at low frequency.
-
Layer 2
Wood wool acoustic panels
Wood fibre bound into a rigid board with an open texture. In Bulgaria, church buildings and civic halls are stone volumes with long decay times.
With a porous backing. Board over mineral backing where the room needs more than the board alone gives.
-
Layer 3
Acoustic carpet and rugs
A tile carpet with a dense polyester face on a felt backing. In Bulgaria, school buildings are hard surfaced with long corridors and gymnasiums serving as halls.
Zoned. Carpet in the circulation and meeting zones, hard floor elsewhere, so the treatment sits where the noise is made.
Architects working in Bulgaria usually need the build-up before the product. We will draw the section and mark what does the work. See how we support architects.
03 / Local conditions
What we see driving Bulgaria briefs
- Two seasons, two deadlines
Coastal work finishes before summer and mountain work before winter. Real dates matter more than a marginally better price.
- Panel block housing
Prefabricated concrete blocks pass speech and footfall between flats through thin, well connected elements. Surface treatment does nothing.
- Service centre floors
Large rooms full of people on calls, where speech privacy rather than echo is the actual problem.
- Black Sea ports, then road
Varna and Burgas both serve the country well. We quote the sea leg and the inland leg separately.
- Assembly and performance rooms
Church buildings and civic halls are stone volumes with long decay times.
- School and campus buildings
School buildings are hard surfaced with long corridors and gymnasiums serving as halls.
04 / Room by room
What each space in a Bulgaria project needs
-
Classroom RT
A number, set against room volume, achieved mostly at the ceiling. Coastal work finishes before summer and mountain work before winter. Real dates matter more than a marginally better price.
- Wood wool acoustic panels, 1200 x 600 mm
- Acoustic panels, 1800 x 900 mm, image printed into the felt rather than onto a facing
- Acoustic carpet and rugs, High density polyester
-
Corridor spill
Long hard circulation feeds every room off it. Treating the corridor helps every classroom at once. Prefabricated concrete blocks pass speech and footfall between flats through thin, well connected elements. Surface treatment does nothing.
- Wood wool acoustic panels, 20 mm
- Acoustic panels, Cut pattern in PET felt, adds visual rhythm without changing the absorber
- Acoustic carpet and rugs, Felt
-
Halls and gyms
Dual use rooms carrying speech, music and sport, where durability decides the product. Large rooms full of people on calls, where speech privacy rather than echo is the actual problem.
- Wood wool acoustic panels, 400 kg per cubic metre
- Acoustic panels, ASTM C423
- Acoustic carpet and rugs, 64 sq ft per pack
Interior designers tend to arrive with the look already decided. We will tell you which finish gets there without losing the acoustics. See how we work with interior designers.
04 / Climate and durability
Why the climate in Bulgaria changes the material, not the target
Bulgaria is cold winters and warm summers, with a wide annual temperature range, and that narrows the material list before acoustics is discussed.
A wide annual swing stresses adhesive fixings and moves timber. Mechanical fixing beats adhesive alone, and PET felt is stable across the range.
The failure we design against here is adhesive failure and timber movement across the annual swing.
If a consultant has set the target, we will quote against their figures rather than ours, and stay out of the scope they own. More on working with acoustic consultants.
06 / Read this first
Six mistakes that turn into a second fit-out
-
Panels at child height where they get damaged
This is the one that comes back as a second fit-out rather than a snag.
-
Treating one classroom and leaving the corridor
Small on the drawing, expensive on site, and almost always found after handover.
-
Choosing a product that cannot take a football
Noise with a source is fixed at the source. Treating the receiving room is the expensive way to get a small result.
-
Treating it as a generic Bulgaria job
Coastal work finishes before summer and mountain work before winter. Real dates matter more than a marginally better price.
05 / Route to site
Getting it to Bulgaria, with real dates
| Ships from | Palwal, Haryana, India |
|---|---|
| Arrives at | Varna or Burgas, then road inland |
| Dispatch | 4 to 7 working days |
| Freight | Sea via Varna or Burgas |
| Support | Drawings, build-ups, BOQ and material that arrives complete |
Standard items dispatch in 4 to 7 working days. Grooved panels and custom colours take longer, and we say so before you order, not after.
Sea freight into Varna or Burgas, then road inland. Air freight for samples and urgent quantities.
Questions from Bulgaria projects
What makes school and classroom acoustics different in Bulgaria?
School buildings are hard surfaced with long corridors and gymnasiums serving as halls. Coastal work finishes before summer and mountain work before winter. Real dates matter more than a marginally better price.
Where should the budget go first on a Bulgaria project?
Classroom RT. A number, set against room volume, achieved mostly at the ceiling. Corridor spill. Long hard circulation feeds every room off it. Treating the corridor helps every classroom at once.
Do you have an office or installation team in Bulgaria?
No. We manufacture in India and supply into Bulgaria. We give you drawings, build-ups, a BOQ and material that arrives complete, and we will tell you plainly when a job needs a local contractor we cannot be.
How does material get to a Bulgaria site?
ships from: Palwal, Haryana, India, arrives at: Varna or Burgas, then road inland, dispatch: 4 to 7 working days. Standard items dispatch in 4 to 7 working days. Grooved panels and custom colours take longer, and we say so before you order, not after.
What goes wrong most often on this kind of project?
Panels at child height where they get damaged. Treating one classroom and leaving the corridor.
What do you need from us to quote?
A plan, a section through the critical partition or ceiling, and what the room is for. From that we can give a build-up and a BOQ rather than a price per square foot.
Next step
Drawings in, BOQ and a delivered date out
We quote from drawings, not from a square foot rate. Send a plan and the section through the critical wall or ceiling and you will get something you can actually build from.