Search for question

find a source for an appropriate R-value to complete the calculation (make sure you quote your source!). Be sure to include a legible sketch/drawing of the wall section with each problem! 3. Calculate the R-value for a simple residential framed home (cavity portion only), using vinyl siding, Tyvek Homewrap, 2" OSB sheathing, 2x6 walls filled with fiberglass batts, and 2"drywall. 4. Calculate the R-value for a residential framed home (cavity portion only), using cedar bevel siding, a vented rain screen (strapping with air gap), 2" of XPS foam continuous insulation,7/16" Zip^TM sheathing, 2x4 walls with mineral wool (Roxul™M) cavity insulation, and 1/2" GWB drywall. 5. Now calculate the R-value through the framing of the above wall, then determine the effective R-value, using a solid wood coverage ratio of 22%. Calculate the percent loss in R-value from the cavity portion to the overall effective value (see Video #2 on Canvas for an example).

Fig: 1

Fig: 2

Fig: 3

Fig: 4