Based on the formula for calculating the R-value of adjacently installed materials, and referring to the R-Value page of the PHPP, provide the working method and final R-value for a wall that the following components sited adjacently moving from the exterior to interior as follows: A 6” concrete exterior wall 2’-0” thickness of straw bale laid on edge 4” stud at 2’ centers with no insulation between 1 layer of 5/8” drywall to form the interior face Assume that the Exterior Surface Film Resistance is for a screened location (i.e. that there is some kind of exterior shading that is not part of the thermal make up of the wall – this could be a tree, an adjacent house or some intentional shading structure, low less likely for an ‘opaque wall’) and that the Interior Surface Film Resistance is for a upward heat flow. 2. Assuming that this gives an indication of the R-value for the envelope generally, would this be appropriate in R-value terms as a starting point for any passive house projects in North America, and if so, in what part of the country / climate zones? 3. Draw a simple freehand section through the wall that shows an estimate of change in temperature through the various components of the wall. Note the interior and exterior sides, and assume the exterior is ‘cold’ and the interior is ‘warm’. No actual quantitative temperature data is required, but the section should be to scale. 4. Name one benefit of this suggested wall make up. 5. Name one disadvantage of this suggested wall make up where space is limited and what you might adjust without losing the benefit of the answer to 3. above. 6. In 20 words describe the mechanism for an internal thermal environment to be lost to the exterior OTHER than by thermal transmittance of adjacent materials, and list a highly performing material that would limit the phenomenon being so much of an issue. 7. Name a material that has a high resistance to thermal transmittance (R-value) but a low impermeability, listing both R and Perm value. 8. Name a material that has a low resistance to thermal transmittance (R-value) but a high impermeability, listing both R and Perm value.
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