Insulating a Flat Roof, Podium or Terrace

Creating energy efficient roofs

Effectively insulating a roof improves the energy efficiency of the building, reducing running costs,
and has positive effects to the environment. There are different insulation options for constructing
a warm roof where the insulation is within the waterproofing system, or inverted roof when the insulation is positioned above the waterproofing system. 

The thermal property of insulation is a significant contributor towards reducing the carbon emissions associated with the heating and cooling of buildings. The solution for each project is unique to the building and its requirements.

The insulation for flat roofs is commonly produced as rigid boards making them easy to handle and install with the variety of waterproofing types and systems. Ordinarily, polyisocyanurate (PIR) insulation is used within warm roof construction as it has excellent dimensional stability and compressive strength, which enables it to withstand foot traffic without depression. Within an inverted roof construction the insulation needs to be able to endure a ‘buried’ scenario beneath ballast or a green roof without detriment to its properties or insulating capability; and so forms of polystyrene are utilised.

Bauder warm roof insulation

BauderPIR is efficient, strong, inert, polyisocyanurate rigid foam insulation with good compressive strength making it  suitable for all kinds of load bearing decks in warm roof construction. Available in flatboard and tapered fabrication.

BauderVIP is a vacuum insulation panels designed to provide high thermal performance in areas with limited installation
height requiring the thinnest solution, such as in balconies and terraces or to mitigate changes to parapet heights in  refurbishment projects. Suited for warm roofs and as a rigid encased panel for inverted roof construction.

BauderROCK is our mineral fibre insulation with proven acoustic and fire resistance properties and utilised within warm roofs in flatboard and tapered options, and as an upstand board for inverted roofs.

BauderGLAS is a cellular glass insulation with high compressive performance. The unfaced boards achieve Euroclass A1 rating, as a faced insulation Euroclass E rating is achieved. Used for inverted roof construction and for warm roofs in flatboard and tapered fabrication.


Fire performance of warm roof insulations

Within a warm roof waterproofing system for TS1187 Test 4, the insulation, be it mineral wool, cellular glass or PIR, is not directly exposed and is therefore determined by the performance of the cap sheet and its system classification; thus these insulants all conform to Building Regulations in the same way – not one achieving a higher rating than the other.

Bauder inverted roof insulation

BauderJFRI is a high performance, lightweight, rigid expanded polystyrene (EPS) insulation in different grades for
inverted roof construction that is resistant to the passage of water and will not degrade with regular wetting.

BauderXPS is a CO2 blown extruded polystyrene insulation with a closed cell structure which makes it impervious to moisture for inverted roof construction.

We also offer non-combustible insulations, BauderGLAS inverted insulation which achieves Euroclass A1 rating, and BauderROCK NC 56mm which achieves Euroclass A2-s1,d0.

Inverted insulation is always ballasted to stabilise it against wind uplift and flotation which can comprise items such as pebbles, paving, screed or a green roof. 

Fire performance of inverted insulations

Bauder inverted insulation is specified in buried scenarios and are fully covered with paving slabs etc and meet current Building Regulations without testing, again with the exception of being used in the construction of a 'Specified Attachment'.