Get some expandable foam filler from you hardware. It seals the gap from airflow, water, vermin and is a good base to render on to. In some countries they only use it to seal the windows, without any water barriers. Be careful not to get it on your fingers. It is extremely sticky. Mask off the sides before you spray in into the gap.Hope this helps. Alfred Botha - www.gapdesign.com.au
gap design
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