Awww what a bummer, no other takers! Looks like Steve Nadeau has taken this round and won the prize!! Good Job Steve!!
Your answer to question 1 was a much less common issue than I have for the answer but it is nonetheless a very real possibility. Your answer was a flashback many years ago and the only easily verifiable cause of high interior humidity levels I have encountered. That house was covered over with trees, on the sides with shrubs, AND ivy growing from ground to over the eaves on almost the entire house. It was like a sauna inside on the Summer day I inspected and plenty of mold growth and other moisture problems.
Your answer for #3 is also more in depth than I was expecting but a sign of good framing!
You definitely know the calculations for attic ventilation but used the 1/150 calculation instead and left out the last step of halving the required number of vents. However you get this right since you know the calculations needed.
These are the answers I have for the questions.
1. Why is “transpiration” an important concept for Home Inspectors no matter what part of the country you live in?
A. Transpiration (shortened description) is the process where a plant will absorb water from the surrounding soil through its roots and then eventually emitting water vapor through stomata in its leaves and in its stems and flowers. Some vegetation can emit more than others. For example a large, mature oak tree can emit 100 gallons a day where a maple tree over 50 gallons a day. Taking this much water out of the soil around a home’s foundation and/or retaining walls can create significant issues in areas with expansive soils. In all areas (expansive soils or otherwise) this can rob the soil of moisture needed to grow ground cover. A lack of ground cover can contribute to erosion of soils around foundations and retaining walls.
2. When creating isolation joints between flatwork and foundation what type of material should be used as a spacer between concrete pours?
A. A compressible material should be used between pours to allow concrete to move slightly if needed and prevent damage to either pour side. These materials can be asphalt impregnated fiber sheeting or one of the other compressible products used for this purpose. A good description for this can be found on the ConcreteNetwork site https://www.concretenetwork.com/concrete-joints/isolation-joints.html .
3. What must be performed if a purlin vertical brace exceeds 8 Feet in length?
A. The vertical brace must itself also be braced. This is specified in the IRC section R802.4.5.
R802.4.5 Purlins. Installation of purlins to reduce the span of rafters is permitted as shown in Figure R802.4.5. Purlins shall be sized not less than the required size of the rafters that they support. Purlins shall be continuous and shall be supported by 2-inch by 4-inch (51 mm by 102 mm) braces installed to bearing walls at a slope not less than 45 degrees (0.79 rad) from the horizontal. The braces shall be spaced not more than 4 feet (1219 mm) on center and the unbraced length of braces shall not exceed 8 feet (2438 mm).
4. When asphalt shingles are packaged they are equipped with a thin strip (typically a polyester film) that is placed on the top shingle side. What is the purpose of this strip and how should it be dealt with during shingle installation on the roof?
A. The placement of this strip coincides with the location of the shingles self sealing strip on its bottom. Its purpose is to prevent the shingles from sealing together prior to installation. When properly installed these thin packing strips should not be visible and should not cause issues with the shingles sealing down. As a result they do not have to be removed and can be left in place. National Roofing Contractors Association (NRCA) Roofing Manual: Steep Slope Roofing Systems is your guide for this item.
5. For proper attic ventilation of 1/300 (building code based alternative to minimum ventilation) of a 3000 Sq. Ft. attic, with a 7/12 Pitch roof, how many 6” X 16” soffit vents with 42” of Net Free Area each are required and how many static/passive vents near the ridge with 61” of Net Free Area each are required?
A. Why try to calculate something like this??? Instead use the Air Vent calculator found on their site at http://airvent.com/ventilation-resources/attic-ventilation-calculator. You can download a PC based spread sheet or if you want on site answers they even offer an app for smart phones. The answer is 21 total soffit vents and 14 total static/passive vents using the Air Vent calculator and 18 Soffit vents and 12 Passive vents (rounded up) when calculating manually. Keep in mind that the 1/150 or 1/300 are the minimum ventilation and as can be seen Air Vent calculates slightly higher which is completely acceptable to do.
Extra credit question. This question will be used as the fifth correct answer if nobody answers all five above but does answer four of the five, or as a determination of the winner if more than one person answers all five above.
6. What are the six finish levels for gypsum board and why is it important to know these?
A. The six finish levels, along with a great deal of important information can be found in the USG The Gypsum Construction Handbook, Chapter 5, found here https://www.usg.com/content/usgcom/en_CA_east/resource-center/gypsum-construction-handbook.html . Also on this site there is much more valuable information to be had! It is important to know how gypsum is applied and finished so that you can advise a client if a visible installation defect can possibly be corrected without a total removal and replacement of the gypsum board.