Hargrove Inspection Services can provide consulting and green verification services for the NGBS.  We are also an ENERGYSTAR partner and have a HERS rater on staff.  Read on to learn about our services for builders!

+ Duct and Envelope Tightness (DET) Verification

Builders Inspection Photo | Hargrove Inspections Augusta GAIn January 2011, Georgia officially adopted the 2009 Energy code (IECC).  While the prescriptive requirements of the new code have been in effect since day one, Duct and Envelope Tightness (DET) testing was given a waiver, but is now required for all homes permitted after July 1, 2011.

The tightness of the building’s envelope is tested by using a blower door.  The apparatus is set up in an exterior doorway, with all exterior doors and windows closed, and all interior doors opened.  The home is then depressurized to -50 Paschals, and the amount of leakage is recorded (CFM@50).  By using the volume of the home, the ACH@50 is then calculated, and the home passes the code requirement if the ACH@50 is less than 7.

Additionally, the HVAC ducts are tested at the rough-in stage for total leakage (must be less than 6 CFM leakage per 100 sq. ft. for the system to pass), or the duct leakage outside of the building’s conditioned area is tested at the completion of construction (must be less than 8 CFM per 100 sq. ft. for the system to pass).  There are several testing methods; the test method performed by GHIS is by using a Duct Blaster along with the blower door post-construction, testing the duct leakage to the outdoors.

+ HERS Ratings

HERS (Home Energy Rating Systems) ratings performed by RESNET-certified Home Energy Raters provide a standardized evaluation of a home’s energy efficiency by calculating the relative energy use index, called the HERS Index.  A HERS® Index of 100 represents the energy use of the “American Standard Building” and an index of 0 (zero) indicates that the Proposed Building uses no net purchased energy (a Zero Energy Building).  In short, a HERS rating is a more complex evaluation of the home compared to a simple energy audit.

+ Thermography

Hargrove Inspection Services is now offering the latest in home inspection technology!

With the use of an Infrared Camera, we can now:

  • Locate damaged or missing insulation.
  • Detect moisture in the building’s envelope.
  • Locate air leaks in walls, floors, ceilings, and around doors and windows.
  • Perform an energy audit locating heat loss causing high utility bills.

Here’s how it works: An Infrared Camera produces thermal images.  All objects emit infrared radiation as a result of their temperature.  An Infrared Camera has the ability to produce an image of invisible infrared light emitted by objects due to heat or lack of heat, otherwise known as an object’s Thermal Condition.  The camera produces a picture similar to a television picture of heat radiation. In layman’s terms, an IR Camera can ‘see’ where the naked eye cannot!

There are countless other uses of Thermography.  Our military uses it for surveillance. Firefighters use the camera to locate people in burning buildings and it has security applications as well.