How do adjust fittings on a upvc window to reduce gap between wind & frame?

you need to replace your hinges also check if there are locking wedges on the hinge side which may not be locating correctly making your gap even bigger.to check this remove one wedge

angus
September 2008

also check your hinges have not snapped at the top

rex
September 2008

also check that your hinges haven`t snapped at the top

tristian
September 2008

check your hinges! your hinges sit inside a groove and if they`re not a tight fit then over time they will slip forward as they are only secured with small screws (i have seen this before.) you may need to drill an extra couple of holes through the hinge and re-fix but be wary that the hinge runs on a slider and you don`t want the sliding block to hit the new screws.
also your gasket (rubber) may have compressed and may need changing.
5mm does seem alot.

tristian
September 2008