It is because the sliding movement of your windows can result in adhesive draught strips to come loose relatively swiftly.  Metal and plastic strips with wipers or 'V-strips' are often much better suited to casement windows in lieu of sash windows.  "Stick on draught

The installation can be done in phases to unfold the price, and you’ll get started viewing Added benefits inside your Strength costs right away. As well as, the rather swift installation procedure suggests minimum disruption towards your daily life. Since secondary glazing is so Expense