Expert: Michael Curry - 1/17/2011

Question
QUESTION: Okay, I am totally confused. Was going to blow in insulation in a couple of bedrooms I'm working on in my 1906 house. Looking around a bit it seems there are several reasons not to do it.
I have removed the trim and am reclaiming it. I plan to drywall the whole room and add 1/2" jamb extensions to the doors and windows. New and updated electric prior to drywall then shoot the original trim back on. Have new custom Marvin widows I am installing as well.
The whole insulation thing recommended, or not? What about a house wrap product over the plaster and lath and then drywall? The insulation advice out there ranges from don't do it all to hard packed cellulose to slow expanding foam to............again, I'm confused!

ANSWER: Hi Brent,

What exactly are you thinking of insulating - blow in is attic usually? Why would you not want to insulate?

---------- FOLLOW-UP ----------

QUESTION: Hi Micheal,

I insulated the attic a few years ago when I added a dormer on the third floor. Went in through the knee walls.
I'm wondering about blowing in the side walls on the second floor from the inside but there are mixed messages about whether it is appropriate or not regarding moisture and payback. What is your opinion?

Thanks. Brent

Answer
Hi Brent,

Insulation doesn't usually cause any moisture problems as it breathes. The walls should be filled with bats (and then 6mil plastic for vapor barrier), as blown in will settle. I guess if you're not removing the drywall/plaster that will be hard to do. Any insulation is better than none.