De or het dakhelling?

The correct Dutch article is:

de dakhelling

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

How to use dakhelling

the dakhellingde dakhelling
this dakhellingdeze dakhelling
that dakhellingdie dakhelling
our dakhellingonze dakhelling
your dakhellingjouw dakhelling
every dakhellingelke dakhelling
which dakhelling?welke dakhelling?
a big dakhelling / the big dakhellingeen grote dakhelling, de grote dakhelling