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1. What is the least amount of slope a shingle roof can have?

A minimum of 2 inches in 12 inches slope is required along with doubling the felt layers underneath.

2. How deep and wide must my house footings be?

That depends on the number of stories the house will be. A minimum of 12”inches deep for all footings and the width will be determined by the amount of stories, 12” inches for a single story, 15” inches for a two story and 23” inches for a three story. This is based on a soil bearing capacity of 1500(psf). Other factors such as brick siding and type of foundation walls could change requirements to slightly larger widths.

3. What rooms require arc-fault circuit protection in a dwelling?

Den/recreation rooms, bedrooms, sunrooms, closets, hallways or similar rooms or areas.

4. What is the minimum size required for a commercial kitchen grease trap?

1500 gallons is the minimum.

Commercial Kitchen Grease Trap Diagram

5. How is the number of plumbing fixtures calculated for a commercial project?

First the occupancy classification must be determined, as set forth by the applicable building code. Using the occupancy classification, the minimum fixture count can now be calculated using the applicable plumbing code.

6. What is the minimum size service disconnect required for a dwelling?

100 amperes 3 wire.

7. What is the minimum distance required between commercial intake and exhaust openings?

There must be at least a 10 foot separation between intake and exhaust openings.

8. Can plastic duct be used as a clothes dryer exhaust duct?

No, dryer exhaust duct must be made of metal and shall have a smooth interior surface. However transition ducts, not exceeding 8 feet in length may be used inside the dryer/laundry room and shall not be concealed within construction. (Transition duct; is a flexible connector used as a transition between the dryer outlet and the connection point to the exhaust duct system. Transition ducts must be listed and labeled for the use; transition ducts are currently listed to comply with UL 2158A).

9. Why is the gas pipe inside my house required to be larger in diameter than the one from the supplier?

Pressure used by gas service delivery companies are typically pounds per square inch, (psi). Pressure is reduced by a regulator to typically less than ¼ psi where the pipe enters the home; therefore larger size piping must be installed to accommodate the volume needed to operate appliances.

10. What is the minimum depth required for buried (yard) gas piping?

12 inches. However gas piping is generally not allowed to be installed in or under a building slab.