Question

3. Calculate the U-factor of the 2 by 4 stud wall shown above. The studs are 16 in. OC (off-center). There is 3.5 in. mineral fiber batt insulation (R-13) in the stud space. The inside finish is 0.5 in. gypsum wall board; the outside is finished with rigid foam insulating sheathing (R-4) and 0.5 in. by 8 in. wood bevel lapped siding. The insulated cavity occupies approximately 75% of the transmission area; the studs, plates, and sills occupy 21%; and the headers occupy 4%. Remember that 2 x 4 studs are actually 1½ x 3½. If the outside conditions are 20 F and 70% humidity while the inside conditions are 70 F and 50% humidity, where is the most likely location for condensation to form? 1. Outside surface 2. Wood bevel lapped siding 3. Sheathing (rigid foam insulation) 4. Mineral fiber batt insulation 5. Wood Stud 6. Gypsum Wallboard 7. Inside Surface

          3. Calculate the U-factor of the 2 by 4 stud wall
shown above. The studs are 16 in. OC (off-center).
There is 3.5 in. mineral fiber batt insulation (R-13)
in the stud space. The inside finish is 0.5 in.
gypsum wall board; the outside is finished with
rigid foam insulating sheathing (R-4) and 0.5 in. by
8 in. wood bevel lapped siding. The insulated
cavity occupies approximately 75% of the
transmission area; the studs, plates, and sills
occupy 21%; and the headers occupy 4%.
Remember that 2 x 4 studs are actually 1½ x 3½.
If the outside conditions are 20 F and 70%
humidity while the inside conditions are 70 F and
50% humidity, where is the most likely location
for condensation to form?
1. Outside surface
2. Wood bevel lapped siding
3. Sheathing (rigid foam insulation)
4. Mineral fiber batt insulation
5. Wood Stud
6. Gypsum Wallboard
7. Inside Surface

3. Calculate the U-factor of the 2 by 4 stud wall
shown above. The studs are 16 in. OC (off-center).
There is 3.5 in. mineral fiber batt insulation (R-13)
in the stud space. The inside finish is 0.5 in.
gypsum wall board; the outside is finished with
rigid foam insulating sheathing (R-4) and 0.5 in. by
8 in. wood bevel lapped siding. The insulated
cavity occupies approximately 75% of the
transmission area; the studs, plates, and sills
occupy 21%; and the headers occupy 4%.
Remember that 2 x 4 studs are actually 1½ x 3½.
If the outside conditions are 20 F and 70%
humidity while the inside conditions are 70 F and
50% humidity, where is the most likely location
for condensation to form?
1. Outside surface
2. Wood bevel lapped siding
3. Sheathing (rigid foam insulation)
4. Mineral fiber batt insulation
5. Wood Stud
6. Gypsum Wallboard
7. Inside Surface

Added by Jeffrey D.

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