Is there any way to insulate basement walls without tearing the drywall down?
Our home has a finished basement, but the walls are not insulated. Basement is heated (forced hot air) and has drop ceilings and dry wall.
While one could drill holes in each bay and dense pack those areas with cellulose or fiberglass - that would generally not be a good idea.
- The main reason for that is, if any water managed to seep in through the walls you would end up with a moldy rotting mess.
- The only product that should be used where it would contact the exterior basement walls is closed cell foam and to my knowledge they do not have a pourable version.
If you have not done so already and want to lower your heating needs - look up and deal with the rim joist area with all those penetrations.
The next stop would be up towards the attic - air sealing and insulating those areas.
For more information:
Read "What's the best way to insulate the underground walls in our basement?" a Q&A answered by Michael Holcomb.