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Home Project FYI. Your Home Project Information and Idea Place - Help and Ideas For Your Home Remodeling Project

The Limitations of a Home Inspection

Home Inspection Limitations

As Per The InterNACHI Standards of Practice For a Home Inspection

The Home Inspection Defined

A general home inspection is a visual inspection for system and major accessible component defects and safety issues. The home inspection is not technically exhaustive. A “general home inspection” and a “home inspection” are the same thing.
A home inspection is designed to reflect, as accurately as possible, the visible condition of the home at the time of the inspection. Conditions at a home for sale can change radically in only a day or two, so a home inspection is not meant to guarantee what condition a home will be in when the transaction closes. It’s not uncommon for conditions to change between the time of the home inspection and the closing date.

Above:  an overloaded outlet with no cover

It’s a Visual Home Inspection

A “visual” home inspection means that a home inspection report is limited to describing conditions in those parts of a home that an inspector can see during the inspection. Obviously, parts of the home that are permanently hidden by wall, ceiling and floor coverings are excluded, but so are parts of the home that were inaccessible during the inspection for some other reason. Some reasons might include lack of an access point, such as a door or hatch, or a locked access point, or because an occupant’s belongings blocked access, or because of dangerous or unsanitary conditions.

There can be many more reasons. The point is that if an inspector can’t see a portion of the home, the inspector can’t assume responsibility for ensuring that a safe and proper condition exists or that systems are operating properly in that hidden space.

Safety During a Home Inspection

Safety can be a matter of perception. Some conditions, such as exposed electrical wiring, are obviously unsafe. Other conditions, such as the presence of mold, aren’t as clear-cut.

In the example of the possible existence of mold, it’s difficult to accurately call it out during a general home inspection because mold sometimes grows in places where it can’t be readily seen, such as inside walls, making its discovery beyond the scope of the inspection.  Also, the dangers to human health are from the inhalation of spores from indoor air.

Most people with healthy immune systems have little or no problem with inhaling spores. A few people whose immune systems are compromised by lung disease, asthma or allergies can develop serious or even fatal fungal infections from mold spore levels that wouldn’t affect most people. Every home has mold and mold colonies can grow very quickly, given the right conditions. Mold can be a safety concern, but it often isn’t. The dangers represented by mold are a controversial subject. Other potential safety issues also fall into this category.

Above:  the cutting torch and gutter system of roof drainage management

System Defects Found During a Home Inspection

Although the majority of the inspection is visual, the InterNACHI Standards of Practice do require inspectors to operate space and water heating equipment, and air-conditioning equipment, if it can be done without damaging the equipment.

We will also examine the major accessible components of certain systems as required by the Standards of Practice. Furnace air filters are one example.

A home inspection is not technically exhaustive, meaning that systems or components will not be disassembled as part of the inspection. For example, an inspector will not partially disassemble a furnace to more accurately check the condition of the heat exchanger. Inspectors typically disclaim heat exchangers.

Hazardous Materials Found During a Home Inspection

Asbestos, mold, lead, water purity, and other environmental issues or potential hazards typically require a specialist inspection, and may additionally require laboratory analysis.

Home Inspectors are Generalists

Home inspectors are not experts in every home system but are generalists trained to recognize evidence of potential problems in the different home systems and their major components. Inspectors need to know when a problem is serious enough to recommend a specialist inspection. Recommendations are often made for a qualified contractor, such as a plumber or electrician, and sometimes for a structural engineer.

Above:  the result of subfloor movement

Inspector Qualifications

Very few home inspectors have been in the inspection industry for their entire working lives. According to an InterNACHI poll, about half the home inspectors have a background in the building trades. Those with a construction background started with a general idea of the systems and components that they might find installed, as well as how those systems age and fail.

This doesn’t mean that inspectors with a background in something other than the building trades are not qualified – only that they started in the inspection industry at a relative disadvantage. Building the skills and developing the judgment to consistently recognize and interpret evidence correctly and make appropriate recommendations are things that can be improved with practice and continuing education.

 

Above:  improper electrical splice

Managing Expectations of The Home Inspection

Part of a home inspector’s job is to manage the expectations of their client. This is especially true when a client has never dealt with a home inspector before. Explaining the limitations of a home inspection to a client will help them develop realistic expectations concerning what to expect from a home inspection report, and what lies beyond the scope of the inspection.

When a home buyer is interviewing inspectors, the buyer should ask about how the inspector handles special safety concerns.

Disclaimers are portions of an inspection agreement or report in which an inspector notifies the client that the inspector will not accept the responsibility for confirming the condition of a portion of the home or of a particular system or component.

Creating realistic expectations in a client’s mind will help prevent misunderstandings and promote smooth real estate transactions.
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Dryer Vent Safety

Clothes Dryer Vent and Preventing Fires

A Clothes dryer evaporates the water from wet clothing by blowing hot air past them while they tumble inside a spinning drum. Heat is provided by an electrical heating element or gas burner. Some heavy garment loads can contain more than a gallon of water which, during the drying process, will become airborne water vapor and leave the clothes dryer and home through an exhaust duct (more commonly known as a dryer vent).

A dryer vent that exhausts moist air and water vapor to the home exterior has a number of requirements:

  1. The clothes dryer vent should be connected. The connection is usually behind the dryer but may be beneath it. Look carefully to make sure it’s actually connected!
  2. It should not be restricted. Dryer vents are often made from flexible plastic or metal duct, which may be easily kinked or crushed where they exit the dryer and enter the wall or floor. This is often a problem since dryers tend to be tucked away into small areas with little room to work. Vent hardware is available which is designed to turn 90° in a limited space without restricting the flow of exhaust air. Restrictions should be noted in the inspector’s report. Airflow restrictions are a potential fire hazard!
  3. One of the reasons that restrictions are a potential fire hazard is that, along with water vapor evaporated out of wet clothes, the exhaust stream carries lint – highly flammable particles of clothing made of cotton and polyester. Lint can accumulate in an exhaust duct, reducing the dryer’s ability to expel heated water vapor, which then accumulates as heat energy within the machine. As the dryer overheats, mechanical failures can trigger sparks, which can cause lint trapped in the dryer vent to burst into flames. This condition can cause the whole house to burst into flames! Fires generally originate within the dryer but spread by escaping through the ventilation duct, incinerating trapped lint, and following its path into the building wall.

House fires caused by dryers are far more common than are generally believed, a fact that can be appreciated upon reviewing statistics from the National Fire Protection Agency. Fires caused by dryers in 2005 were responsible for approximately 13,775 house fires, 418 injuries, 15 deaths, and $196 million in property damage. Most of these incidents occur in residences and are the result of improper lint cleanup and maintenance. Fortunately, these fires are very easy to prevent.
The recommendations outlined below reflect International Residential Code (IRC) SECTION M1502 CLOTHES DRYER EXHAUST guidelines:

M1502.5 Duct construction.
Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces, with joints running in the direction of air flow. Exhaust ducts shall not be connected with sheet-metal screws or fastening means which extend into the duct.

This means that the flexible, ribbed vents used in the past should no longer be used. They should be noted as a potential fire hazard if observed during an inspection.

M1502.6 Duct length.
The maximum length of a clothes dryer exhaust duct shall not exceed 25 feet (7,620 mm) from the dryer location to the wall or roof termination. The maximum length of the duct shall be reduced 2.5 feet (762 mm) for each 45-degree (0.8 rad) bend, and 5 feet (1,524 mm) for each 90-degree (1.6 rad) bend. The maximum length of the exhaust duct does not include the transition duct.

This means that vents should also be as straight as possible and cannot be longer than 25 feet. Any 90-degree turns in the vent reduce this 25-foot number by 5 feet, since these turns restrict airflow.
A couple of exceptions exist:

  1. The IRC will defer to the manufacturer’s instruction, so if the manufacturer’s recommendation permits a longer exhaust vent, that’s acceptable. An inspector probably won’t have the manufacturer’s recommendations, and even if they do, confirming compliance with them exceeds the scope of a General Home Inspection.
  2. The IRC will allow large radius bends to be installed to reduce restrictions at turns, but confirming compliance requires performing engineering calculation in accordance with the ASHRAE Fundamentals Handbook, which definitely lies beyond the scope of a General Home Inspection!
M1502.2 Duct termination.
Exhaust ducts shall terminate on the outside of the building or shall be in accordance with the dryer manufacturer’s installation instructions. Exhaust ducts shall terminate not less than 3 feet (914 mm) in any direction from openings into buildings. Exhaust duct terminations shall be equipped with a backdraft damper. Screens shall not be installed at the duct termination.

Sometimes we will see many dryer vents terminate in crawlspaces or attics where they deposit moisture from water vapor, which can encourage the growth of mold, wood decay, or other material problems. Sometimes they will terminate just beneath attic ventilators. This is a defective installation. They must terminate at the exterior and away from a door or window! Also, screens may be present at the duct termination and can accumulate lint and should be noted as improper.

M1502.3 Duct size.
The diameter of the exhaust duct shall be as required by the clothes dryer’s listing and the manufacturer’s installation instructions.

Look for the exhaust duct size on the data plate.

M1502.4 Transition ducts.
Transition ducts shall not be concealed within construction. Flexible transition ducts used to connect the dryer to the exhaust duct system shall be limited to single lengths not to exceed 8 feet (2438 mm), and shall be listed and labeled in accordance with UL 2158A.

In general, an inspector will not know specific manufacturer’s recommendations or local applicable codes and will not be able to confirm the dryer vent’s compliance to them, but will be able to point out issues that may need to be corrected.

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