S & B Services LLC
Inspected Once, Inspected Right!
Thermal-Scan Services and Fees
Thermographic surveys of residential structures for insulation and infiltration (air-leaks) are performed base on the recommendations of ASTM C 1060 – 90.
The following criteria should be followed in order to provide the client with a meaningful analysis of the structure:
1.It is preferred that the survey be conducted from the interior of the structure and there should be at least a difference of 18 deg F temperature between the interior and exterior (ambient) surfaces of the structure being measured for at least 4 hours which would suggest that the survey be accomplished in the morning and indoor temperature should be increased as necessary.
- Note: For a meaningful analysis, every effort should be made to ensure there is clear, visual access to exterior wall and ceiling surfaces.
2.Exterior surveys can be accomplished provided the following criteria can be met:
- At night or before sunrise where the surfaces have not been exposed to solar radiation for at least 3 hours;
- Should not be conducted when the wind speed is greater than 15 mph;
- Should only be accomplished when the surface is dry.
3.The client should identify specific areas of concern where extensive investigation may require additional time outside the normal time span to conduct the survey.
Results of the survey will be published on a professionally prepared report. Results may typically show the following characteristics which are offered only as a guideline to the client:
1.Intact Insulation—as seen from the warm side of the construction: dark parallel lines, representing the framing; uniformly lighter areas between the framing lines, representing the insulation. As seen from the cool side of the construction: the framing lines are light. The areas containing insulation are uniformly dark.
2.Insulation Missing Completely—as seen from the warm side of the construction: light parallel lines, representing the framing; darker areas between the framing lines, representing the empty space between framing members. Convection may be visible in vertical framing, as evidenced by a gradient from dark (cooler) at the bottom of the space to light (warmer) at the top. As seen from the cool side of the construction: the framing lines are dark, the areas between framing are light and convection is still lighter at the top of vertical spaces.
3.Insulation Partially Missing—the dominant effect is as described as above, except that missing insulation shows as a well-defined dark region, as seen from the warm side and as a light region as seen from the cool side.
4.Other Thermal Patterns—irregular variation of the thermal pattern in the spaces between framing members may indicate a combination of possible causes, including varying density of insulation, convection or air leakage, moisture, or thermal bridges. A partial list of examples follows:
- Variable density insulation often allows air leakage and convection and thereby creates intruding areas of surface temperature variation.
- Areas where insulation contains significant moisture conduct heat much more readily than dry insulation or no insulation. Within the moist region there may be a mottled and diffused thermal pattern. Temperature variations within the pattern are not extreme.
- Thermal bridges may be caused by the presence of fasteners or framing members.
- Air leakage, (infiltration) usually at joints and junctions (wall corners, floor to wall/ceiling to wall connections, door/window frames) in the building envelope, typically produces irregular shapes with uneven boundaries and large temperature variations. Air leakage can be detected thermographically when air of a different temperature than the surface viewed comes from the side of the envelope opposite the observer.
- Indoor temperatures may vary from room to room. This can result in large areas showing brighter than others, as seen during an exterior survey. Independent verification of indoor temperatures can determine whether such variations are due to variations in indoor temperatures or to differences in the thermal qualities of the envelope.
- If an object has been removed from a surface, there may be a thermal signature where the object insulated the surface. This effect diminishes with time after removal of the object.
FEES
HOME ENERGY SURVEY
UP TO 2,000 SQFT:
$250.00
$250.002,000 SQFT - 3,000 SQFT: $350.00
$350.00EACH ADDITIONAL 500 SQFT: $50.00
$50.00MISCELLANEOUS SURVEY
ELECTRICAL, MOISTURE ETC.$100.00/HR
$100.00/HR(Above prices includes report detailing deficient areas.)
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