I AM REPLACING WINDOWS IN MY 2 DORMERS,THE NEW WINDOWS ARE SMALLER THAN THE ORIGINAL,..I AM HAVING TO BUILD A NEW STUD WALL TO MAKE THE OPENING SMALLER. THE STUD AND THE EXTERIOR ARE NO PROBLEM BUT WHEN INSULATING ETC WHERE ARE THE VENTILATION GAPS TO BE? BETWEEN THE INSULATION AND EXT BOARD? BETWEEN THE INSULATION AND PLASTERBOARD? BETWEEN THE EXT BOARD AND CLADDING?
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