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What to use to install a granite window sill on Styrodur – mortar or foam?

Asked 9 months ago.
Active 9 months ago.
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  • styrodur
  • window sill
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How do you install granite window sills on Styrodur boards? In my case, the window sills in the concrete basement are made of Styrodur, since Styrodur was used as the formwork. Are granite window sills now installed on Styrodur in a mortar layer or with installation foam?

asked 9 months ago
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155unobtrusiveB
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We have soffit that is backed with Styrodur. Like all other window sills, it is also in a mortar layer.

answered 9 months ago
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482dg
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Before applying the Styrodur mortar, sand it again lightly (60 grit sanding mesh or similar) and then it will adhere.

answered 9 months ago
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138Finn Bohler
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