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Flat roof insulation with STYROFOAM / ROOFMATE

    The performance and longevity of flat roofs depends upon many factors, including the  position of the insulation within the construction. If insulation is placed below the  structural deck (cold roof construction) the structure remains cold and there is a  considerable risk of condensation; for that reason cold deck roofs are not  recommended and are now seldom used. Insulation placed above the structural deck  and beneath the waterproof layer (warm roof construction) reduces the risk of  condensation but, because the waterproof layer is thermally isolated from the rest of  the roof construction, it is exposed to wide temperature fluctuations with consequent  increased risk of premature failure (Figure 01).

   The inverted roof concept overcomes the problem by placing thermal insulation above  the waterproof layer, maintaining it at an even temperature close to that of the building  interior and protecting it from the damaging effects of UV radiation and from mechanical   damage. The insulation protects the water proof covering from:

   
  • wide temperature variations +80 to -20° C.
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  • degradation from weathering.
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  • mechanical damage during construction, use and maintenance. The waterproof layer acts as a total vapour control layer and, being on the warm side of the insulation, is maintained above dewpoint temperature so the risk of condensation is minimised. The inverted roof concept has other benefits.
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     The Insulation can be:

       
  • installed in any weather.
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  • added to, without stripping the waterproof layer.
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  • easily lifted and replaced/re-used if the building is altered.
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     The insulation for an inverted roof must:
       
  • resist water absorption.
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  • be unaffected by freeze/thaw cycling.
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  • withstand surface traffic.
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  • protect the waterproof layer long term.
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  • be ballasted to prevent floatation.
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  • be protected from UV and mechanical damage.

  •   The inverted roof insulation system has been proven successful for more than 35  years.
     
      Insulation of inverted flat roofs with STYROFOAM / ROOFMATE  
     
      The system is applicable for all types of flat roofs:
  • non-accessible roof with gravel of light-weight ballast
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  • terrace, vehicle accessed roof deck
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  • green-roof, roof garden
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  • flat roof refurbishment – plus-roof concept.

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    Figure 02 Inverted roof with aggregate Ballast   Figure 04 Inverted green roof
     
    Figure 03 Inverted roof with paving ballast   Figure 05 Renovation of flat roofs
         
         
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