Concrete Roof Insulation or Inverted Roof Insulation Products & Solutions 

Polystyrene Product Company Are Leading National Suppliers Of Polystyrene Concrete Roof Insulation or Inverted Roof Insulation Products In South Africa. Speak To Us Today!

What Is Concrete Slab Roof Insulation? 

Concrete Roof Insulation, Also Known As Inverted Roof Insulation.


It Is When A Layer Of Insulation Is Placed On Top Of Your (Already Waterproofed) Concrete Slab To Insulate The Concrete Slab And Building From The Sun And Cold And To Protect The Waterproofing From Deteriorating In The Sun.


The Picture Above, Taken On The Cape Town Convention Centre Roof, Shows How The Roof Insulation Is Installed.


Inverted Concrete Roof Insulation Is An Excellent Way To Insulate Concrete Roof Buildings In South Africa.

Roof Insulation For Your Concrete Slab Is An Important Aspect Of Your Build!

Why Is Concrete Roof Insulation So Important?

Concrete Slabs Can Get Very Hot & Very Cold

Concrete Roof Insulation Is Both Important And A Building Requirement In South Africa. 


In South Africa We Have Hot Summers And Cold Winters. 


Consider That When It Is 40 Degrees Outside And The Sun Is Baking On The Concrete Roof Slab, The Slab Is Absorbing That Heat Making It Extremely Hot.

This Heat Is Transferred Into The The Slab And The Into The Interior Of Home And Buildings Significantly Changing The Comfort Levels Of The Building.


Without A Good Insulation Layer Above The Concrete Roof Slab, The Only Way To Combat This Heat Is To Have Hard Working Cooling Systems Inside The Building.


The Inverse Happens When It Is Very Cold.

Insulation Reduces Internal HVAC Costs

What Is Required In Terms Of The SANS 10400 XA Building Regulations?

Roof Insulation Requirements Per Region In South Africa Are Based On The Climatic Zones

There Are Many Cost Effective Insulation Products Suitable For This Application. 

Call Us If You Need Help!

Thermal Insulation Requirements

R-Values Per Region

Johannesburg, Bloemfontein:

Zone 1 | R-Value = 3.7

Pretoria, Polokwane:

Zone 2 | R-Value = 3.2

Makhado (Luois Trichardt), Nelspruit:

Zone 3 | R-Value = 2.7

Cape Town, Port Elizabeth:

Zone 4 | R-Value = 3.7

East London, Durban, Richards Bay:

Zone 5 | R-Value = 2.7

Upington, Kimberley:

Zone 6 | R-Value = 3.7

How Do You Install Concrete Roof Insulation?

Installation Is Actually Very Simple! 

Step 1:

The Concrete Slab Is Cast

Step 2:

A Screed-To-Fall Layer Is Cast On Top Of The Slab (For Run-Off.)


Step 3:

The Polystyrene Sheets Are Cut And Tightly Packed On Top Of The Waterproofing Layer.

Step 4:

A Filter Fabric Is Placed On The Polystyrene And Then A 50mm Layer Of Stone Is Placed On Top Of The Filter Fabric To Ballast It.

Which Thermal Insulation Products Are Suitable For Concrete Roof Insulation?

Recent Large Projects

We Have Supplied Many Large Roof Construction Project But The Cape Town Convention Centre Roof Extention Is One Of Our Favourites!