Easy - You insulate where there would be an ADVERSE effect with regards to temperature if you DIDN'T insulate the wall (or floor or celing, for that matter.)
If you want to heat one room and cool another room that's butt-up against it, then insulate. If the rooms are to be ALWAYS at the same temperature, don't insulate the wall.
My best to ya and hope this helps.
Jay J -Moderator
PS: If you want to spend that $$$, then consider sound-proofing material. THAT might prove useful ...
PPS: God Bless America!
However, for sound insulation purposes, insulation in all walls is worthwhile. It is relatively cheap compared to other building expenses and you will thank yourself for insulating your bedroom or den from your kids room when they are teenagers!
what kind of insulation should we use behind the dry...
Conservatory subloor and insulation exposed to rain ...
OSB vs insulation board behind brick
- 15 Old House Features We Shouldn't Abandon
- 17 Tiny Bathrooms We Love
- 16 Designs for a Low-Cost DIY Coffee Table
- Insanely Easy 60-Minute Home Improvements
- 12 Sheds You Could Live (or Work) In
- Assembly Required: 15 DIY Kit Homes
- 30 Things Every Adult Should Know How to Do
- 10 Surprisingly Simple Woodworking Projects
- 7 Surprising Other Uses for Mayonnaise
- 9 Ways to Make Your TV Look at Home
- 9 Totally Amazing Mobile Home Makeovers
- 11 Lessons to Learn from AirBnB's Tiniest Homes
- 10 DIY Ways to Redo Your Wall—Without Paint
- 8 Smart Shoe Racks You Can Make Today
- 7 Easy Budget-Friendly Backyard Makeovers
- Worth It: 8 Renovations That Pay You Back
- 7 House Sounds Never to Ignore
- Watch These 10 Home Trends Take Off in 2015
- 11 Things Never to Keep in Your Bedroom
- 12 Places You Never Clean—But Should!