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Insulation is the most practical and cost-effective way to make a building more energy efficient, keeping it cooler in summer and warmer in winter, and providing substantial savings in heating and cooling costs. Proper thermal insulation is also one of the key requirements for passive buildings, a construction concept that aims at reducing the building’s overall ecological footprint.

Of the many different insulation products available on the market, rigid polyisocyanurate (PIR) boards are among the most efficient in terms of thermal performance per millimeter. This means that a thin and lightweight PIR board can achieve an insulation value equivalent to other thicker, heavier insulation products.

The Elevate RESISTA AK insulation board for flat roofs consists of a closed-cell polyisocyanurate (PIR) foam core laminated on both sides to a gastight multi-layered aluminium complex. It provides outstanding and stable thermal resistance, dimensional stability and compressive strength, which translates into a long lasting superior performance.

RESISTA AK boards are available flat or tapered with straight or rebate edges, in thicknesses ranging from 30 to 240 mm. They can be installed over wooden, concrete and metal roof decks, both on new-build and refurbishment projects, regardless of the roof slope.

RESISTA AK is compatible with a wide variety of waterproofing membranes and adhesives and is suitable for use on mechanically fastened, fully adhered and ballasted single-ply roofing systems.


Proper water evacuation is a crucial requirement for flat roofs. Finished substrates should be designed providing a fall for positive drainage, as per local codes, to avoid ponding water at drain outlets and roof penetrations. The use of tapered insulation boards may be a solution when the roof structure does not provide the adequate slope. RESISTA AK tapered boards provide a slope of 2%

Features and benefits

Superior thermal resistance

RESISTA AK has the same thermal performance as thicker (and heavier) insulation materials.


Wind uplift performance

Foam and facer have been designed for optimum adhesion in case of a fully adhered membrane application. 


High compressive strength

The board provides good walkability, making it an excellent choice for roofing applications where dead and/or live loads are expected.


Good reaction to fire

Boards do not smolder, melt or drip and they do not promote fire propagation.


Safe and easy handling

Boards do not have sharp edges and can be easily cut into different sizes thanks to the printed grid.



Easy to transport, hoist and install. Helps reduce the roof total weight, as well as installation time and costs.



When installed correctly, RESISTA AK will last for the lifetime of the building.



The board’s foam technology uses a HCFC-free blowing agent with a low GWP (Global Warming Potential) and zero ODP (Ozone Depletion Potential).




  • CE as per EN 13165
  • Manufactured in an ISO 9001 and ISO 14001 certified factory


RESISTA AK insulation boards are typically sold in bundles composed of a number of boards dependent upon their thickness. Tapered boards are supplied with a roof plan and indicated numbering.


RESISTA AK insulation boards must be installed using fasteners and plates or approved insulation adhesives. For detailed installation information, please refer to the Installation Guidelines or the Technical Information Sheets.