Insulate roof windows - this is how it works

Especially in the roof area, insulation is an important factor for savings in heating costs. Therefore, everyone can imagine how crucial the right insulation is to a skylight. Here we show what to look for.

Insert insulation around the skylight

If one has bought a finished set of windows and interior trim from a well-known manufacturer, usually notes are attached, as the insulation should look indoors. For home improvement, however, it is important how the insulation for a skylight in a self-built panel has to look.

Insulate the roof window step by step

Insulating around the new skylight is often associated with some fumbling. We therefore use strips, narrow boards or thin slats as aids. So you better see where the path goes and sloping places can be isolated.

  • insulation
  • vapor barrier
  • Adhesive tape for vapor barrier
  • Groins / thin slats
  • Nails / screws

Insulate roof windows - this is how it works: windows

  • saw
  • knife
  • ruler
  • stapler
  • hammer
  • screwdriver

1. Install underbody for fairing

The substructure to which the gypsum plaster boards or the wooden cladding are to be attached must first be cut to size. This Unterlattung must later be exactly correct, otherwise the whole range of clothing later skewed.

2. Cut the vapor barrier

The vapor barrier is cut to size and attached to one side. Then fill the cavity with insulation and secure it by tacking the vapor barrier. Of course, this is necessary only at the oblique spaces.

3. Seal the vapor barrier

The vapor barrier must now be taped clean at all seams and edges. To do this, use a special adhesive tape with aluminum foil.

4. Install the panel

Now you can screw or nail the cladding on the battens, as needed.

Tips & Tricks

If you have very unusual gaps on your skylight, you can make sausages from the vapor barrier film, the insulation and the appropriate adhesive tape.

These can push you into inaccessible joints. Before that, however, a normal insulation should still be attached.

Video Board: Insulation in windows works!