Specialist Cellulose Fibre Installers

Welcome to Cape Insulation.

Cape Insulation installs cellulose fibre made from recycled paper milled with an organic fire retardant and rodent repellent. This creates a safe and effective natural insulation material. A well insulated home will reduce electricity, gas or wood consumption (for heating or cooling).


The cellulose fibre layer will keep up to 89% of the heat generated in your roof out of your house, resulting in your home having a more temperate feel. The more extreme the weather conditions, the more effective the insulation.


The damp, cold air is kept out of your home and any heat is retained, making your home naturally cosier.

Energy Saving:

Insulating your home is a once off investment in natural home comfort and energy savings. A well-insulated home will require substantially less energy to heat or cool your home. The lifetime of energy cost savings, far out way the initial investment in insulation installation. will The cost savings will pay for the insulation and you continue getting a life time of saving energy.

Acoustic Insulation:

Cellulose Fibre is an excellent acoustic insulation. It is three times (3X) denser then fibreglass and absorbs more sound. This is great for metal roofs, wooden floors and noisy rooms.

Fire Retardant:

Cellulose Fibre is tested by the SABS and fire rated B/B1/B. It does not support flame spread. It has proven that it is better to have Cellulose Fibre Insulation if you do have a fire. It will slow a fire down, may contain it too a smaller area and may even help put it out. It is used in wooden homes all across America.

Rodent Repellent:

The same fire retardant dries out the skin of rodents and insects and they cannot nest in it. We have successfully used Cellulose to keep homes rodent free.


The Cellulose is completely non-allergenic. It is just recycled paper and the fire retardant is like an inorganic salt. It is also used in medicine. The Cellulose is also trapped in the roof space.


Cellulose Fibre has a life time guarantee as long as the building and roof stay intact. It may compress slightly but will still keep the stated R-value due to the density.



We specialize in cellulose fibre as it is the most economical, eco-friendly and effective insulation medium for your home.

The combination of recycled paper and the aerated installation method creates an excellent snug fitting insulating layer. The result is a more ambient temperature throughout the year as well as saving electricity, gas or wood consumption.
Real live tests on identical buildings found Cellulose was 36% more airtight and saved 26.4% more energy than fibreglass or blanket type insulation, and kept the building 4 degrees warmer during colder months.

Cellulose fibre insulation for a life time of comfort and energy savings.

Technical Info

The new national building regulations (NBR) SANS 10400 – XA, require all new buildings and alterations to be insulated in order to save energy. (View Document Here)

With the extreme weather we are experiencing and rising energy costs, it makes sense to retrofit insulation on existing buildings. You will live in a better environment and the cost savings mean that the insulation will pay for itself.

Cellulose fibre has been approved by the SABS and fire tested SANS 428 and classified B/B1/2.

Eskom have completed studies on the different climate zones and a R-Value of 3.7 is recommended Down lights, fans and any heat source is protected by a galvanised sleeve.



R Value

Reduction in heat flow %



*The R-value is a measure of the thermal resistance of a material. The R-value given is the total measurement of the roof assemble and insulation combined.

Sound proof : Cellulose Fibre vs Fibreglass

The big burn : Cellulose Fibre vs Fibreglass

Temperature difference : Cellulose Fibre vs Fibreglass

Frequently Asked Questions

Click on the + below for all our answers

What does it cost?

Cellulose is the most economical insulation available.  The cost is dependent on the thickness of the cellulose, square meterage and the number of down light sleeves required.

How much energy will I save?

The City of Cape Town estimates up to 60% of your heating and cooling cost can be saved through insulation. (link to page) Ensure that you insulate your ceiling prior to installing air conditioning or heating as you might find that installation of air conditioners / heating is no longer required due to the efficacy of the cellulose fibre insulation.

How thick should it be?

The new building regulations recommend as a minimum “deemed to satisfy” thickness of between 100 to 135mm thick. This will give you an R-value of 3.7. (link to page)

How much does the temperature change?

The temperature will be a more ambient temperature. During summer months, the heat is prevented from penetrating the ceiling, keeping your home cool.  During winter months, the warmth is kept inside. A house where we installed insulation in Fish Hoek maintains a temperature of around 21 degrees through summer and winter due to the living room/kitchen design and ceiling insulation. The other rooms fluctuate more due to bigger windows.

How long does the installation take?

An average size house (110 square metres) takes approximately four hours. The whole installation process is quiet, quick and clean. The installation process is also owner supervised.

What if I have an air conditioner or fire place?

You will need to use them a lot less often and for  shorter periods. The required temperature is reached quicker and lasts longer once switched off. The effect is also spread further into the home.

Does it need maintenance?

No maintenance required.

I have old insulation that is not working?

Depending on the state of the insulation we can either remove it or spray over it. It is best to remove old fibreglass insulation as it breaks down and the fibres become toxic. We can top up Cellulose that was not installed to the new recommended thickness.

What if it gets wet?

Cellulose can handle small amounts of water as it will naturally dry out. Major leaks may need the insulation to be dried outside and then replaced. Generally all insulation materials trap water and need to be dried out.

I have a lot of wind in my roof?

Wind in the roof is a good thing as your roof needs to breath. Cellulose mats together and can handle a lot of wind. We can put netting if the wind is extreme.

What if there is a fire?

Test proved it is better to have Cellulose insulation as a fire retardant if you did have a fire. It will slow the fire down and may even help contain it. It also gets better with time.

What about allergies and is it safe?

Cellulose is non-allergenic and the fire retardant is also used in medicine.

Does it have a guarantee?

Cellulose comes with a lifetime guarantee as long as the insulation is not disturbed.

Gordon Summerfield, Somerset West
Thought that I would give it a few weeks before getting back to you – thanks for a great job – we have noticed a good drop in in-house temperature, so I can confirm your product works. Thanks once again (it is no easy job in summer!) very glad we decided to do it and for your service.
Grant Momple, Paarl
A quick note from a very satisfied customer out in Paarl. Your insulation works very well. Sometimes I cannot believe that I have not put on the aircon when I compare the cool temperature inside the house compared to outside. A product that I will certainly recommend to friends and colleagues!
Karla Peet, Gardens
I just wanted to say, I really “Love my insulation”… it has made my flat so perfectly temperate and so much more pleasant to be in. I don’t dread coming home anymore.
Nevil Carrington, Fish Hoek
Our house now feels as it has a blanket over it – We are extremely happy!


Free quotes & advice

083 497 6915