If your garage is 8’ high, one roll will fill 4 area between the studs. So how many stud bays do you have....? Two 18’ walls and a17’ wall will have 53’ of total wall length, divided by 1.3 (16”/12”) gives you 40.75, or 41 bays. So you might be able to do it with 10 rolls, but I would buy at least 11.
If you are installing in a side wall, you should use the product designed for wall construction. 2X4 you may use R11, R13 or R15. 2X6 you may use R19 and R21. If you are installing in your attic as a floor application, you will want to achieve a higher R value as heat rises. You may use loose fill, batts or rolls for attic floor installation.
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If your rom is 8’ high, just take the total circumference of the room 36 (8+8+10+10) and divide by 1.33 (this is the 16” stud spacing in feet) and you get 27 spaces between the studs. A roll will fill 4 spaces so 27/4= 6.7, so you will need 7 rolls.
yes, but you cannot leave insulation exposed.
17X28 = 476 sq ft. 476/40(sq. ft. in roll) = 12 rolls You may want to look at R13K15X94 batts as they are pre cut to 8' so there is no cutting. You would need 5 bags at 116.25 sq. ft. Pre cut batts result in less labor to install. For your ceiling, recommendation would be R30 - R49 depending on your local codes.
Please check with your HVAC company on my best method for this.
If this is electrical wire, yes you can install insulation with electrical wire. Please be sure to split the batt and have the insulation behind and in front of the wire for best installation practices.
i could be left uncovered but i would not recommend painting it over because its paper and paint would not loog good on it!