I hired Brand Insulation to insulate my old and cold double brick house. The house was built in the 1920's and is extremely cold in the winter.
They insulated the main floor by drilling through the brick on the outside of the house. However, for the second floor they stated they couldn't go from the outside due to equipment limitations, and instead needed to drill holes on the inside. This was truly unfortunate as it created more work for me to patch up holes and repaint / touch up the rooms effected.
The result is the main floor is noticeably less drafty, its warmer, and much more comfortable. The upper floor is still pretty cold, but in defense of the product, there are large drafty windows upstairs, and my attic requires more insulation as well in order to fully judge the success of the job.
Overall, I'm very satisfied, and I'm sure when I replace my upper windows and insulate my attic, I will notice it is much warmer.
The guys were excellent, hard working, and friendly.