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Learn more about Multipor boards: https://www.xella.pl/pl_PL/Multipor-m... The junction of the window frame and the wall is a place where thermal bridges can occur. This can be prevented by proper window installation and additional insulation of the splays. Multipor 3 cm boards are the best method of insulating window splays in both new and renovated houses. Contact us: 801 122 227 Reliable contractors, architects and a compendium of knowledge in one place https://building-companion.pl/