Many people hear the words “paper insulation” and immediately assume it must burn like ordinary paper. That sounds logical, but it is not accurate when talking about correctly manufactured cellulose fibre insulation used in South African ceilings.
Cellulose fibre insulation is made mainly from recycled paper, but it is not the same as loose newspaper in your roof. Reputable South African cellulose insulation products are treated with fire-retardant mineral compounds such as borax, boric acid and other inorganic salts. These additives help the material resist ignition, slow combustion and reduce flame spread.
Hoax: Cellulose insulation burns like ordinary paper
This is misleading.
Untreated paper burns easily. Treated cellulose fibre insulation behaves differently. When exposed to flame, properly treated cellulose insulation is designed to char rather than flare up like loose paper. The fire-retardant treatment helps prevent the material from supporting flame spread.
In South Africa, fire performance should not be judged by opinion or marketing claims. It should be checked against local fire testing and classification standards such as SANS 428, SANS 53501-1 and SANS 10400-T.
Fact: South African cellulose insulation products are fire-tested
According to the TIPSASA Fire Register, both Eco Insulation and Thermguard Cellulose Fibre are listed as tested cellulose fibre insulation products with a SANS 428 classification of B/B1/2 for horizontal applications and a SANS 53501-1 classified at B-S2,d0
This means the correct claim is not that cellulose insulation “cannot burn” under any possible condition. The correct South African claim is that compliant cellulose fibre insulation is fire-retarded and classified not to support flame spread when installed and used according to its tested application.
Fact: Fire-retardant treatment matters
Eco Insulation states that its cellulose fibre insulation is made from recycled newspapers and treated with inorganic salts, borax and boric acid. Thermguard also refers to borate treatment as the reason its cellulose insulation achieves the required SANS 428 & 53501-1 fire-retardant classification.
This treatment is what separates tested cellulose fibre insulation from ordinary paper.
Hoax: Cellulose insulation causes pests
Correctly treated cellulose fibre insulation can help deter pests. Borate-based treatments are commonly used in cellulose insulation because they assist with fire retardancy and also make the material less attractive to insects and rodents.
This does not mean insulation is a complete pest-control system. If a roof already has rats, mice, birds or other pests, the entry points must still be closed and the infestation must be dealt with properly.
Fact: Cellulose insulation can help with mould resistance, but it is not a waterproofing product
Borate-treated cellulose fibre has mould-inhibiting properties, but no insulation product should be exposed to ongoing roof leaks or damp conditions. If the ceiling or roof cavity has water ingress, that problem must be repaired first.
Good insulation performance depends on correct installation, adequate roof ventilation, dry conditions and the correct installed thickness for the required R-value.
Fact: South African compliance matters
For South African homes, cellulose fibre ceiling insulation should be assessed against:
SANS 428 & 53501-1 fire performance requirements
SANS 10400-T fire protection requirements
SANS 10400-XA energy-efficiency requirements
The correct R-value for the relevant South African climatic zone
Valid product testing or certification from a reputable manufacturer or installer
What homeowners should check before installing cellulose insulation
Before choosing a cellulose fibre insulation product, ask the installer for:
The product fire classification
Proof of SANS 428 & 53501-1 testing
The installed thickness and R-value
Confirmation that the product is suitable for your climatic zone
Installer experience and warranty details
Whether the product is listed by TIPSASA or supported by recognised South African test documentation
Final verdict
The claim that “paper insulation burns like paper” is a hoax when applied to properly treated and tested cellulose fibre insulation.
The more accurate fact is this: cellulose fibre insulation is made from recycled paper, but reputable South African products are treated with fire-retardant mineral salts and tested to local & in some cases international fire standards. They are designed to resist ignition, char under flame exposure, not melt and not support flame spread when correctly installed.
However, avoid exaggerated claims such as “it cannot burn”. The safer and more factual wording is: compliant cellulose fibre insulation is fire-retarded, tested and classified for use in South African roof and ceiling applications.
