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Fixing roof light to Polyurethane covered upstand

Warrentdo
in Skylights & Roof Windows

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I have just covered my flat roof with Ultraflex (Polyurethane).

I have now to seal and fix a roof light onto an upstand (that is covered with Ultraflex).

When installing the Ultraflex roof they recommended to fill any gaps with Polyurethane sealant as the Ultraflex wont bond to Silicone.

With this in mind should I use Polyurethane sealant to stick down the roof light as Silicone wont stick to Polyurethane?

 

Regards,

 

Warren.

Use Sikaflex EBT+ for the seal between the ultraflex on the upstand and the frame. Clean the ultraflex with IPA or Multisolve to make sure it’s squeaky clean first. 

    • Like 1
    • Author

    I've just remembered that I have 10 tubes of Soudaflex 40FC Polyurethane PU Sealant that i could use if ok.

     

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