Posted by Mike Ciavattieri on Wed, Jun 16, 2010 @ 10:20
We've all heard about the health dangers of mold in residential and commercial buildings. Having measures in place to prevent or control the growth of mold is of course prudent, and mold remediation is a necessary and often difficult task. For mold testing, control, and remediation, it is best to rely upon an expert in the field.
Preventing & Controlling the Growth of Mold
Mold prevention is necessary because mold has the potential to cause a number of health problems, including allergic reactions, asthma attacks, and lung inflammation. Mold growth occurs when there is a buildup of water or excessive moisture in an area within a structure. This can often be prevented by making sure that plumbing does not leak, and that the humidity inside a building is kept at a level between 30-50%.
Humidity and moisture buildup can be prevented by ensuring that the ventilation system is sufficient and working properly, and that air conditioners, dehumidifiers, and exhaust fans are used in areas prone to high humidity, such as the bathroom, or in the kitchen when cooking or cleaning. Insulation will also help to control the buildup of moisture. If there is water damage within a home or building, water damaged materials need to be discarded and replaced, and dehumidifiers need to be used to dry the area quickly.
Why Mold Remediation Experts Are Necessary
Walls or ceilings that show a discoloration, and the presence of a musty smell are signs that there may be water damage. Buildings are especially susceptible after heavy storms, or if there is a plumbing leak. A mold remediation expert should be called if there is suspected water damage or mold contamination. The expert can identify and assess the water damage and the potential for mold, and determine what needs to be done, as well as recommend improvements for the future prevention of mold.
Only a mold remediation expert will possess the skills, experience, and the specialized equipment necessary to thoroughly check a structure for mold, such as a moisture meter, which can detect moisture in building materials. Mold remediation experts also possess the proper disinfectants needed to fight and destroy mold spores, as well as the recommended respirators, goggles, and other protective clothing. Mold remediation should never be attempted by anyone who is not an expert and does not possess the proper equipment, or you are exposing yourself to significant health risks.
Posted by Mike Ciavattieri on Tue, Mar 17, 2009 @ 11:29
So with all the recent hype regarding granite countertops and radon gas emissions, I thought I'd combine granite countertops with one of my other ‘hot topic' specialties: mold investigation.
On the scale of hygiene, the typical granite countertop falls somewhere below Stainless and Corian, well ahead of ordinary laminates, and relatively even with quartz (aka "engineered stone"). A special variation of engineered quartz called "Silestone" exists that is advertised as having built-in anti-microbial properties. This is due to the addition of a special chemical compound during its manufacture.
Unlike engineered stone however, granite benefits greatly from the addition of a sealer. Left unsealed, granite can absorb small amounts of liquid, which may lead to staining. Similarly, open pores in granite surfaces can also harbor small amounts of liquid. These situations may lead to bacterial growth.
The great news about granite however, is its superior ability to be cleaned. In a study by the Hospitality Institute of Technology and Management, granite was beaten only by Stainless Steel in a standardized hygiene test. The study showed that washing a granite surface with ordinary yellow dish soap and water reduced E.Coli bacteria levels by 36,000 times. If the dish soap was followed up by a 10% solution of household vinegar, the reduction of E. Coli increased to 80,000,000 times! Because caustics like vinegar can damage some sealers, its best to just stick with the dish soap.
So here are a few tips to keep in mind:
Granite should be initially sealed and then reapplied following the manufacturers recommendations
Avoid cutting raw food directly on a granite surface - use a cutting board.
Wipe up any spills immediately and wash down when completed.
Avoid using bleach or other caustics as this can damage the sealer
Avoid placing hot objects directly on the surface as this may also damage the sealer.
Follow these quick tips and keep your surface dry and clean - and you can be sure mold won't be hiding in the depths!
Posted by Mike Ciavattieri on Tue, Feb 10, 2009 @ 11:32
It's been a long, cold, and snowy winter here in Massachusetts and over the past months of performing home inspections I have run into numerous instances of ice dam formation and the subsequent questions from prospective buyers and sellers.
So what causes ice dams? Simply put, ice dam formation is caused when melting snow runs down the roof and then refreezes at the roof edge. The water runs down the roof slope underneath the blanket of snow and then refreezes into a band of ice at the roof edge creating a "dam". Additional snow melt can then pool against the dam and leak into the building through the roof or roof trim. Ice dams can actually form with as little as 1 or 2 inches of snow accumulation given the right weather circumstances.
The question I receive most often is, "what can I do to prevent ice dams?" The answer, while it may sound contradictory at first, is increased amounts of insulation and increased attic ventilation. In order to understand why, one needs to fully understand the mechanisms of ice dam formation: The upper roof (or attic) surface is typically at a temperature that is above freezing - this is what causes the melting at the upper roof surfaces. The lower part of the roof (or attic) surface (along the eaves) is typically below freezing - this is what causes the refreeze. It is heat lost from inside the house is the source of the melting at the upper roof surfaces! Because the lower roof surfaces (particularly the overhangs) are not warmed by indoor heat-loss, these regions can remain at below freezing temperatures, especially during periods of very cold outdoor temperatures.
Check your home carefully when ice dams form, even when there doesn't appear to be a leak. Get in your attic and look at the underside of the roof sheathing and roof trim to make sure they haven't gotten wet. Check the insulation for dampness. And when leaks inside your home develop, be prepared. Water penetration often follows pathways difficult follow. You may wish to hire an inspector that is equipped with an infrared or thermal imaging camera, as this equipment may be able to spot water penetration that is not readily visible with the naked eye. Ultimately, however, you will want to correct the problem to prevent future occurrences:
Insulation: Houses in this region of the country should have attic insulation of at least R-38, or about 12 inches depth of fiberglass or blown in material. The most notable problem area is at the far eaves, or right above where the exterior wall is.
Ventilation: A ‘ridge/soffit' ventilation system is currently the most effective ventilation system, and is the system found in most new construction. If you have an older home, you may still be using a power fan, static roof vent(s) and/or gable end louvers - these simply aren't as good and will have a more difficult time retarding ice dam formation. Ridge/soffit systems should also include foam or plastic baffles at the far eaves to prevent insulation from blocking the soffit intake vents. If you have soffit baffles currently installed, make sure they are not crushed or displaced - they are relatively flimsy items yet they perform a very important function.
Air Leakage: Although insulation is what primarily keeps warm air in our house, small (or large) holes can allow significant volumes of warm indoor air to pass into attic spaces. Some of these sources can include: pull-down staircases, doorways leading to attic staircases, recessed lighting, bathroom exhaust fans, and various holes for cable TV, internet, etc. Take the appropriate measures to seal up or insulate these areas, it may be the difference maker!
Remember: Always wear personal protective equipment when making repairs of any nature. And when in doubt, always hire a professional. Winter is almost over!
Mike Ciavattieri is a Massachusetts Home Inspector and owner of BONSAI Inspection Company, of Abington, MA