Thermo-Floc Blow-In insulation is fiberglass loose-fill insulation with a vegetable-based binder that can be used as wet or dry blow-in ceiling and cavity insulation. 


Thermo-Floc R-values


  • Thermal Conductivity (W/m.K of 0.04515)
  • Thermal Resistance (R-value of 2.21m2.K/W) at 100mm
  • Thermal Resistance (R-value of 2.55m2.K/W) at 115mm
  • Thermal Resistance (R-value of 2.99m2.K/W) at 135mm
  • Thermal Resistance (R-value of 3.32m2.K/W) at 150mm


Thermo-Floc Loose-Fill Insulation


This loose fill insulation has thermal and acoustical performance, easy installation, environmental protection and the personal well-being of occupant’s post-installation. Thermo-Floc Blow-In ceiling and cavity insulation can be bonded with a motionless, odour-free air-setting binder to seal and control the movement of fibres during the installation process. They say the binder does not affect the colour or performance of the product.

Thermo-Floc Blow-In fiberglass Insulation is a type of insulation made of small glass fibers that are blown or poured into a space to provide thermal insulation.

There are some disadvantages to using Thermo-Floc loose-fill fiberglass insulation. Here are some of the main disadvantages:


  • NOT SABS APPROVED – only tested
  • This is a brand-new product (1- 2 years old) that hasn’t been tested in roofs for very long.
  • Settling: Over time, loose-fill fiberglass insulation can settle, reducing its effectiveness and leaving gaps in the insulation that can allow air to escape or enter, decreasing the overall energy efficiency of the building.
  • Installation: Installing loose-fill fiberglass insulation can be more difficult than other types of insulation and requires specialized equipment and expertise.
  • It’s also a very light loose fill product which won’t be good in South African roofs because most roofs aren’t sealed properly and the smallest draft could blow the product around.
  • Lower R-value of 3.32 than both Knauf and Aerolite which have a 3.38 and you need a 150mm installed to compete with the 135mm of both the other products.
  • Thermo-Floc Blow-In Insulation is only SABS tested and NOT approved. This means the product was only tested once for performance. Approved products are tested on a regular basis to make sure that samples consistently hold the same R-values, densities, and fire ratings.


We recommend sticking with tried and tested products like Knauf and Aerolite.


Thermo-Floc Blow-In Insulation SABS Testing


The acceptance of a sample for test and the issue of a test report are subject to SABS conditions of test, which are the following:


  1. If published or reproduced by the client, a test report shall be reproduced in full, i.e. the reproductions shall contain the printed as well as the typed parts of the report, nothing excerpted.
  2. A test report relates only to a sample submitted for the actual test. It furnishes or implies NO guarantee whatsoever in respect of a similar sample that has not been tested by the SABS.
  3. This report does not imply that the user has obtained pre-approval to apply the SABS certification mark nor does it imply approval by SABS, of the quality and/or performance of the sample that has been tested. No person my falsely claim or declare that any commodity, product or service complies with a South African National Standard or other publication of the SABS.
  4. While every endeavour will be made to ensure that a test is representative and accurately performed, and that a report is accurate in the quoted results and conclusions drawn from the test, in terms of the Standards Act, SABS or its officers shall not be liable for anything done or omitted in good faith when error made in carrying test.