R49 is equal to 13 settled inches of cellulose insulation. If the insulation has not settled yet then it should be between 15-16" deep.
12 inches
10 inches corresponds to about R-38.
Regular 10". High density which is more expensive 8"
You can do one of two things. Firstly, you could erect a second wall outside the house. Of course there are many instances where this would not be feasible. In such cases, one would have to baton the walls from the interior to create a cavity, which would then be filled with some form of material with a high insulation rating i.e. fibreglass wool or rigid insulation boards. To provide further insulation, special plasterboard (drywall) can be purchased with higher insulation ratings than regular plasterboard. However, using these thicker boards would further encroach on the room in question, which might not be very desirable at all since the batons would already take a couple inches away. Alternatively use an External Wall Insulation system.
200 cubic feet.
depending on the length it is around 3--7 Kilos
In the U K 250 millimeters /10 inches is the required limit so if you 5 inches just now you will have to add 5 inches on top the nearest size to that is 150 mm/ 6 inches
Typically, companies handle their own insulation. There are many types of insulation, pipe, wall, and attic insulation are just a few. Construction companies, and plumbers usually do their own installation of insulation.
There are various acrylic glues made specifically for this. Many can be bought at local Plastics and Fibreglass suppliers.
There Are Many Good Soundproofing Insulation Materials, but Insulation and Mass-Load Vinyl Seem to Be the Best. Mass-Loaded Vinyl and Insulation Are Good for Filling Gaps.
Depends how big insulation rolls are.