Insulating the perimeter of an existing opening?

[shbrooks]

We’re attempting to renovate our house which was built in the mid 90s.  Having stripped the wallpaper, we found a lot of the plaster around the door was cracked and fell away and we’re now left with some quite large/deep holes to fill (2”/2”).  I can’t see daylight though them but can feel the cold air coming through.  The front door is still in place and we don’t plan to replace it at this stage.

 

I need to repair the plasterwork around the door, and could use expanding foam, but don’t believe it will provide the best levels of insulation.  Are there any alternative products that can fill and insulate deep holes around the perimeter of existing openings whilst the door/window is still in place?

 

Thanks

[Moonshine]

How about.

 

20-25mm PIR boards? cut to size with a knife and wedge / fix in, expanding foam around the gaps.

 

When dry cut the expanding foam flush, and plaster over.

 

A photo would help

[jfb]

if you use expanding foam around doors make sure you brace the frame or use some low expanding foam.

[Big Jimbo]

In my opinion expanding foam will be better than trying to cut, and stuff anything else in there.

[shbrooks]

Thank for your comments. Here's a few photos.

[shbrooks]

[Simplysimon]

as a lot of the damage is in the area where the door fixings are, are they well fixed or using the plaster as adhesive and could it be the opening and closing of the door is cracking the plaster? if well fixed i'd look at removing all the plaster next the door, insulating and replastering