De or het isolering?

The correct Dutch article is:

de isolering

  • English: insulation, isolation
  • Plural: de isoleringen
Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) 1. het isoleren, de isolatie 2. (techniek) het materiaal dat isoleert

How to use isolering

the insulationde isolering
this insulationdeze isolering
that insulationdie isolering
our insulationonze isolering
your insulationjouw isolering
every insulationelke isolering
which insulation?welke isolering?
a big insulation / the big insulationeen grote isolering, de grote isolering
the insulation (plural)de isoleringen, deze isoleringen

Dutch words ending in isolering

warmte-isolering

In compound words, the last part decides the article. See the rule

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).