INSULATION BUILT TO LAST 50+ YEARS.
Insulation for those who look
beyond the lowest price.
Natural. Vapour-open. Healthy.
For homeowners, contractors and architects who choose comfort, health and sustainable performance - and don't just look for the lowest price.
FIRST CHECK IF THIS FITS YOU...
Not sure? Browse our knowledge base.
Our biobased insulation materials
We work with natural materials that breathe, regulate moisture and keep your home healthy. The only logical choice for Dutch brick houses, which are vapour-open by nature.
Onze materialen
Honest is honest
When is biobased not the right choice?
If you're looking for the cheapest solution
If insulation is purely a cost item
If you want a quick, standard solution
No problem - then we are not the right partner. We're happy to give you honest advice or refer you to a good alternative.
Commercial & larger projects
Larger project? Sharp pricing, expertly delivered.
From 200 m² we blow in biobased insulation for between €25 and €30 / m² excl. VAT (labour and materials). Prep work and finishing (vapour-open membranes, battens and finish layers) we can take care of as well.
One point of contact, tight planning and a healthy building that lasts for decades.
info@isoleerbewust.nlHonest pricing upfront
What does biobased insulation actually cost?
No "from" prices, but realistic ranges excl. VAT - visible right away.
Roof insulation
€55 – €250 / m²
interior or exterior
Floor insulation
€35 – €70 / m²
crawl space or on top of floor
Facade insulation
€80 – €160 / m²
interior or exterior
Minimum project size: €2,300 (blow-in) · €4,950 (full package basic) · €5,800 (full package plus) - excl. VAT.
Yes, that is 10–20% more than an average glass wool quote. Read what to look out for in quotes
The honest comparison
Biobased vs. glass wool vs. PIR
| Biobased | Glass wool | PIR | |
|---|---|---|---|
| Price | 10–20% more expensive | Cheapest | Currently more expensive than biobased |
| Insulation value (Rd) | λ ≈ 0.036–0.046 W/mK | λ ≈ 0.032–0.040 W/mK | λ ≈ 0.022 W/mK - highest Rd per cm |
| Summer comfort | High phase shift (10–12 hrs) | Low buffering (4–5 hrs) | Low buffering (3–4 hrs) |
| Moisture regulation | Buffers & releases moisture | No buffering | Vapour-tight - risk of trapping moisture |
| Fire behaviour | Class B/E - meets standard | Class A1 - non-combustible | Class B/E - meets standard |
| Sustainability & health | Stores CO₂, biodegradable | High production energy | Petroleum-based, hardly recycled |
Price
10–20% more expensive
Cheapest
Currently more expensive than biobased
Insulation value (Rd)
λ ≈ 0.036–0.046 W/mK
λ ≈ 0.032–0.040 W/mK
λ ≈ 0.022 W/mK - highest Rd per cm
Summer comfort
High phase shift (10–12 hrs)
Low buffering (4–5 hrs)
Low buffering (3–4 hrs)
Moisture regulation
Buffers & releases moisture
No buffering
Vapour-tight - risk of trapping moisture
Fire behaviour
Class B/E - meets standard
Class A1 - non-combustible
Class B/E - meets standard
Sustainability & health
Stores CO₂, biodegradable
High production energy
Petroleum-based, hardly recycled
Hiring the wrong insulation
company is costly. A choice you can't afford to make.
There are plenty of companies that spray rubbish into your walls, don't care about airtightness and ignore moisture management in your construction. You only notice the consequences years later. When it's too late.
Choosing the wrong company leads to:
Insulation material that sags after a few years and no longer insulates
Moisture problems and mould due to a sealed, non-breathable construction
No airtight sealing, causing heat to escape through gaps and seams
Chemical materials in your home that worsen indoor air quality
We don't come by right away. And that's exactly why our projects actually work.
Most insulation projects go wrong before the execution even starts. We make sure you understand what you're doing first.
Price indication & understanding
First, discover online what your home needs, what it costs and why materials differ. No surprises later.
Home inspection
A specialist visits your home, assesses the situation and prepares an advisory report with build-up, material and an honest price indication.
Execution & aftercare
We manage the execution with dedicated installation partners who work to our standards. You have a dedicated project manager as your point of contact - and we remain available, even after completion.
What this gives you
- ✓ Better choices through upfront insight
- ✓ Less risk of mistakes
- ✓ Better performance from your insulation
Our reviews
"Isoleerbewust insulated our roof fantastically with wood fibre. The difference in comfort is enormous — cool in summer, warm in winter. True craftsmanship."
Arash Aazami - Rotterdam
Featured projects
A selection of our recent insulation projects with natural materials.
Blow-in project — Esther
The private client did all the preparatory work themselves. We blew in the entire roof and parts of the walls with cellulose insulation in one day.
Exterior roof insulation — Amersfoort
In Amersfoort we insulated the roof from the outside with semi-rigid wood fibre boards, and installed new fascia boards and roof tiles.
Pitched roof straw blow-in insulation
Commissioned by Fullhouse BV we insulated 2,500 m² of pitched roof of former herring warehouses in Vlaardingen with 40 tonnes of Bioblow straw.
Knowledge centre
Latest articles
Laat dampopen isolatie vocht door?
Veel mensen denken dat dampopen isolatie vocht binnenlaat en zo schimmel veroorzaakt. Het tegendeel is waar. Dampopen gaat over waterdamp, niet over regen of tocht, en een goede dampopen opbouw is gewoon luchtdicht. Dit artikel legt het verschil uit tussen het dauwpunt, de temperatuur waarbij vocht neerslaat, en het condensatievlak, de plek in je muur of dak waar dat gebeurt. Je leest waarom natuurlijke materialen vocht bufferen en laten terugdrogen in plaats van opsluiten, en met welke vier vragen je een installateur ontmaskert die het verschil niet kent.
5 min
Honest answers to the questions you actually have
Curious what insulation
can do for your home?
Take the free insulation check and receive a personal insight within 2 minutes.