If the insulation is fiberglass this can be dangerous as the fibers can be inhaled causing lung.
Gaps between window frames and walls inside.
On your home s exterior caulking windows is needed in the same places.
The unfinished frame can leave the insulation inside the wall around the window frame exposed.
But if done incorrectly it can lend a sloppy amateurish look.
Come spring add or replace weatherstripping for a longer lasting fix.
If your gaps are even larger you may wish to consider using expanding foam.
They may be caused by natural settling of the house cracking existing mortar or just by bad workmanship when the window was fitted.
In either case gaps around a window frame are not good and can lead to damp penetrating the internal walls window frames and beyond.
Gaps where the window trim meets the window frame inside the window.
Gaps can appear around any type of window frame on a house of any age.
Caulk seals the gaps between the window trim and the siding on your house.
When you re looking to fill in the gaps around your window frames you will probably find that there are several different options available.
For large exterior gaps mainly ones wider than one centimetre you may be better off using mortar.
Caulking windows to give them a finished look inside and out and seal out leaks and drafts is a fairly common diy task.