De or het dakverdieping?

The correct Dutch article is:

de dakverdieping

Rule Words ending in -ing: almost always de. See the rule

How to use dakverdieping

the dakverdiepingde dakverdieping
this dakverdiepingdeze dakverdieping
that dakverdiepingdie dakverdieping
our dakverdiepingonze dakverdieping
your dakverdiepingjouw dakverdieping
every dakverdiepingelke dakverdieping
which dakverdieping?welke dakverdieping?
a big dakverdieping / the big dakverdiepingeen grote dakverdieping, de grote dakverdieping