Inverted roof insulation
In an inverted roof construction, the principal thermal insulation layer is located not only above the roof structure but also above the waterproofing, resulting in the waterproofing, structural deck and support structure being at a temperature close to that of the interior of the building. No vapour control layer is required.
Minimum levels of insulation required in flat roof constructions are governed by Building Regulations. These levels are rising on an ever-increasing scale as the Government strives to meet its targets for reducing CO2 emissions.
We have different types of inverted insulation depending on your project's requirements and budget.
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Spotlight on Inverted Insulation
Inverted Roof Insulation is robust. It has to be, it will be exposed to all weathers for the life of the building. It is also cost-effective and specified within a flat roof situation, especially for podium decks and plazas.
Let's take a look at inverted insulation and the properties and characteristics of these products.
Inverted insulations come in different types, expanded polystyrene (EPS), extruded polystyrene (XPS), cellar glass and vacuum insulation panels (VIP). Each have their own attributes to enable the specifier to meet the needs of the project. Your Bauder area technical manager will take you through the correct selection for your project taking into accounts budget, thicknesses and fire performance.
Inverted insulation is exposed to moisture – unlike warm roof insulation that is encapsulated by waterproofing layers – and therefore needs to tolerate moisture, with any change in performance being accepted and accounted for by increasing the thickness of the insulation and incorporating a WFRL.
Within the standard, clause 4.6.2.2 – Inverted Roofs, BS 6229 suggests that it is prudent to increase the design thickness of the thermal insulation of an inverted roof where a Water Flow Reducing Layer (WFRL) is being relied upon by “not less than 10%”.
Within the standard, clause 4.6.2.2 – Inverted Roofs, BS 6229 suggests that it is prudent to increase the design thickness of the thermal insulation of an inverted roof where a Water Flow Reducing Layer (WFRL) is being relied upon by “not less than 10%”.
Bauder inverted insulation is specified in buried scenarios and are therefore fully covered with paving slabs, a green roof finish, pebble ballast etc and meet current Building Regulations without testing, with the exception of being used in the construction of a 'Specified Attachment'.
The layer is loose-laid directly atop the inverted insulation to reduce the passage of rainwater to the waterproofed deck, enabling the greater part of drainage to take place at the WFRL level. The WFRL is resistant to liquid water but permeable to water vapour to allow any moisture vapour to disperse.
Contact us today about your project
Each project is unique in its requirements, and we have lots of resources and examples of our work available to help guide you. If you are looking for an inverted flat roof solution for your project, then get in touch with our team to discuss your project’s individual needs.