At Bay Area Mold Pros, we regularly explain to our clients that the reason that mold growth is so common on drywall is the fact that even though the main component in drywall is gypsum, the face of drywall is paper, and mold loves paper! Mold spores are looking for “organic matter” on which to grow. Organic matter is any material that was once “alive.” Paper, which comes from trees, is therefore organic matter. Other examples of organic matter found in all of our homes are wood (both trim wood and framing lumber), animal skins (like leather and wool), and food sources (particularly old food found in garbage containers and compost containers).
But what the photo above depicts is often hidden from view, the “back side” of drywall, which is the side attached to the framing. The homeowners in this San Francisco home inspected by Bay Area Mold Pros removed the mold-covered drywall from the wall framing in this room, only to be shocked at what they believed was mold within the wall framing, on the back side of the drywall affixed to the other side of the framing. This is a reminder that not only is the face of drywall made of paper, the back of drywall is also made of paper. And when drywall gets wet, it is very common for mold to start growing within the wall framing, on both the framing lumber and the backside of the water-saturated drywall.
A slide sample of this suspected mold was submitted to our lab, and not surprisingly, the results showed high levels of multiple types of mold spores, including the dreaded Stachybotrys. Many homeowners are familiar with Stachybotrys through internet articles (commonly referred to as “toxic black mold”), and when this genus of mold is found growing within our homes, there is reason to be concerned. The air sample collected in the room with the depicted framing revealed high levels of Penicillium, Aspergillus, Cladosporium, and numerous lesser-known mold spore types. But the bottom line was this…there was obviously an advanced mold growth problem in this home, and a professional mold remediation was called for.
At Bay Area Mold Pros, our background is in construction. Owner Rick Bruce has been remodeling homes throughout the San Francisco Bay Area for 45 years. Rick’s son Tyson, also a licensed general contractor, started remodeling homes with his dad while still in high school, and went on to work as a union carpenter through his college years. Rick and Tyson have both owned their own construction companies, and Tyson is still working both in the construction industry and the mold inspection industry. Rick is trying to segue to an eventual retirement by running the day to day operations of Bay Area Mold Pros, Rick no longer works actively in the construction industry.
If you suspect that you have a mold problem in your home in the San Francisco Bay Area, give Bay Area Mold Pros a call. Rick and Tyson can quickly and accurately assess what the underlying conditions that are leading to mold growth. Don’t wait until the problem becomes as advanced as the one depicted in the photo! Give us a call today.
At Bay Area Mold Pros, we complete hundreds of mold inspections around the San Francisco Bay Area every year, and at most of our inspections we determine that ground water is contributing to mold growth within the home being inspected. Ground water issues can be addressed with a combination of solutions such as French drains and sump pumps. These systems seek to divert water away from the perimeter of the home, or to remove it (via electric pump) once it has made its way past the perimeter of the home.
One of the most common issues we identify at Bay Area Mold Pros, when inspecting the home’s exterior, is that one or more rain leaders that are draining the roof water are depositing it directly adjacent to the home’s foundation, often on the “high” side of the lot. This condition is exactly the opposite of what we want to see in terms of how rain water is dealt with. Very large amounts of water can be discharged from these rain leaders, since the rain water that they are collecting might be coming from several hundred square feet of roof surface.
The solution to this condition is actually pretty simple. By connecting the bottom of the rain leaders to flexible or rigid plastic pipes, the water from these rain leaders can be re-directed around the home to another part of the property, ideally, at a lower elevation than the elevation occupied by the home. Although this won’t have any affect on the naturally-occurring ground water that surrounds the home, it will prevent the rain water that is coming from the roof from exacerbating the ground water problem present around the home.
At Bay Area Mold Pros we are experts in the construction-related issues which often underlie mold growth problems. Rick is a licensed general contractor and owns his own construction company, Bruce Construction. Tyson holds his own license as a general contractor, and owns his own construction company, Tyson Bruce Construction. Both Rick and Tyson are also Certified Mold Inspectors. But what separates Bay Area Mold Pros from every other mold inspection company in the San Francisco Bay Area is the fact that Rick and Tyson have been building and remodeling homes throughout the San Francisco Bay Area for a combined seventy-plus years. So if you suspect a mold-growth problem in your home in the San Francisco Bay Area, give us a call at Bay Area Mold Pros!
Inspector Insights: What Most Homeowners Miss
For any of us that are buying or selling a home, one of the most anxiety-inducing thoughts is the prospect of overlooking an important repair. Without a professional at your side or years of experience yourself, there are so many crucial considerations that can easily be missed. These overlooked repairs can turn a great investment into a not-so-great investment or a dream home into a veritable nightmare. To help you avoid these oft-hidden pitfalls, we rounded up home inspection experts from Sacramento to Philadelphia. Read on and let these seasoned experts and homecare veterans guide you through the most frequently overlooked repairs that homeowners always forget to fix!
Too many small things can add up to a big thing
Sellers should address minor items that give a poor representation of the home like gutters that are falling off the home, slow sink drains and any quirky shortcut fixes because it wasn’t done correctly the first time. I inspected a home where there were limited electrical outlets in the basement so the seller had set up a network of extension cords that ran throughout the open basement ceiling instead of installing outlets. – Spotlight Inspection Services
Bad Pressure Reducing Valve (PRV): To avoid damage to valves on appliances or fixtures, like a toilet, you do not want the water pressure to be above 80 psi. PRVs typically wear out every 15 years and when they do the water pressure can skyrocket to 150 psi! Get a simple water gauge for less than $10 and test the water pressure to see if your pressure is too high. If it is, a plumber can easily replace the PRV. – At-Ease Inspections
Some of the pre-sale repairs that are most often overlooked are any item that would potentially be covered under the Home Warranty that the seller may be providing to the buyer i.e. electrical, plumbing, appliances, etc. Any item covered under the Home Warranty that is listed as “deficient” in a home inspection report would be considered a “known” pre-existing condition and NOT covered by that warranty. With this in mind, I always recommend that buyers request these repairs to be made so that they can get the full value of the Home Warranty if one is offered. It is always to the seller’s benefit to remove any potential negotiating points from the buyer. – The Home Inspectors
Don’t forget the attic
The most overlooked or ignored spaces in a home tend to be attics and crawlspaces. These areas need to be evaluated before listing because they can hold some of the most unpleasant surprises. Non-professional repairs, structural damage due to leaks, or major moisture & mold problems will bring the smoothest of transactions to a screeching halt. These can be avoided if found and addressed prior to selling. – Integrity Home Inspection
Focus on Foundation
Grading is also commonly missed and is easy for homeowners to correct. Grading is simply adding dirt to the perimeter of your foundation. You look to achieve a slope of 1/4″ per foot out to 6′ from the exterior foundation wall. – Inspection Pros LLC
Make sure your electrical was done professionally
In many homes a clear indication that a permit was never taken for the completion of a roughed-in basement is the location of the furnace isolation switch, it should be at the entrance to the “Room” where the furnace is located. Before a basement is finished the room is the whole basement and the switch is located close to the bottom of the stair, it should be relocated adjacent to the door into the smaller mechanical room that usually is constructed. Amateur electrical work in basements quite often results in wiring connected in reverse polarity (HOT and Neutral Reversed) which is not identified because it still functions as required but is a safety issue. Non Professional work on electrical panels often results in un-closed open holes where the wiring was considered to be located or removed at a different time and then forgotten rather than having a closure plug installed. Again a safety concern and a possibility of vermin entry which could result in a short at an inappropriate time. These issues throw up a RED flag for an inspector and cause them to look a little closer. – At Home & Play Inspections
The best way to know what repairs you need to make before selling is by getting a pre-listing home inspection. The most common repairs that are overlooked by homeowners take place in the kitchen and bathrooms. Plumbing fixtures and valves are often corroded which are called out during a home inspection. Plumbing fixtures can be conducive to moisture-related issues and should be inspected and repaired as needed before selling your home.
Also, the grout or caulking between the sinks, shower walls, counters, and plumbing fixtures is often deteriorated. These items should be resealed. Repairing these small details will show potential buyers and inspectors that there is pride in ownership when providing a positive reflection of the home. The devil is in the details. – The Inspectors Company
Inspect your HVAC system
The homeowner should check the HVAC system for any leaks as well as check for adequate insulation in attics and crawl spaces. Attics are the main source of energy loss in any home and it is important to make sure your home is up to code. You will see saving on your energy bill right away if your attic is brought up to code. – Insulation Pros Colorado
If you’re getting ready to sell your home, one of the last things that you want is to have a prospective client discover a problem in your home that could de-rail an accepted offer. Although most buyers now obtain home inspections as a part of their contingencies, a few of these buyers also obtain mold inspection reports, and unfortunately, many of these homes have mold-growth issues. If these problems are discovered early enough, they can be addressed prior to listing a property for sale, and the home can then be listed with a “clean bill of health” regarding mold issues. So if you’re considering selling your home, do yourself a favor and get a certified mold inspector to conduct a thorough inspection of your home before your first buyer ever sets foot in the home. – Bay Area Mold Pros
Scope Your Sewer Line
I would imagine that most people are aware of what’s broken in the interior of their home and don’t need to read an article to find out. But as the article title suggests, the “Repairs You Need to Make Before Selling” are probably the ones you’re not aware of and some of those are in the areas you don’t see very often, if at all. When was the last time you had your sewer line scoped? Your dryer vent cleaned? Your roof inspected? And, if your house is on a raised foundation, are you aware of what lies beneath? Getting a pre-listing inspection will take the guesswork out of what you need to repair (or disclose if you’re not willing to repair) before putting your house on the market. – Sacramento Home Inspections
Rain and groundwater management
Rain management is one of the most overlooked and estimated issues with many of the homes we inspect. Something as simple as a gutter full of debris can lead to leaks in the home, standing water in the crawlspace. This problem compounds as the gutter debris travels into the downspouts and through the storm drain lines. The rules are simple, make sure any water that lands on the roof makes it into a gutter, any water that enters the gutter flows freely to a downspout, and is discharged at least 6 feet away from any building components. These simple steps can prevent $1,000’s of unexpected and unnecessary damage over the years. – PacWest Home Inspections
Water intrusion issues due to a lack of proper storm/groundwater control. This can cause a lot of damage especially if the home is on a crawl space or basement, if the crawl space has not been inspected within the last year we would highly recommend getting a pre-listing inspection prior to putting the home on the market. The majority of the deals we see get terminated is due to damage present under the home. If you own a home with a crawl space ask yourself when is the last time it has been visually inspected if the answer is over three years or you can’t remember it’s time to get an inspection done. – AHI Residential & Commercial Inspections
Cracks in your hardscaping
Home sellers usually forget to repair hairline step cracks along the exterior concrete (masonry) block walls. Hairline cracks below 1/16” in width and are not structural defects. However, the step cracks can provide entry for moisture intrusion to damage interior wall materials and runaway future home buyers for assuming these are structural defects. – Pro Inspect Solutions
When Homeowners decide to list their home, it is important to listen to their Agent’s suggestions to make the process smoother. At Continental Home Inspections we have often found instances where the Seller has been diligent in their efforts, but all too often accessibility to systems and components may oftentimes be overlooked. Blocked electrical panels, crawlspace locks, attic access, and stored items in attics and crawl spaces can result in items being missed and deemed inaccessible. This can result in re-inspection fees, which may also ask the question “who will pay for the re-inspection?” A checklist and a walk-thru of the home prior to the Inspector’s arrival can not only save both parties time but also money. Continental Home Inspections
I would recommend anyone who is selling their home to check/verify the following: trip & reset each of your GFCI (ground fault circuit interrupter) outlets (these outlets are the ones with a test/reset button). Verify your electrical panel is obstruction-free: nothing stack in front of it or blocking access. Make sure each of your locks on your doors actually works and locks the door when engaged. Check each of your sinks will retain water when the stopper diverter is engaged. Finally, verify that your air filters are CLEAN and if not replace them. – Top 2 Bottom Home Inspection
The most commonly overlooked items we have come across are electrical related. The exterior GFCI should be covered with the proper exterior covering and must be operational. The GFCIs throughout the house should also be operated in the kitchen, bathrooms, garage, and unfinished basement. These are some of the most common safety issues we encounter. – Echo Home Inspections
Originally published on Redfin
Most of our home inspections completed by Bay Area Mold Pros include an attempt to determine if moisture is present behind bathroom wall tile. Moisture often makes its way past wall tile, often through the space between the tile when grout is missing, or when the grout was improperly applied, or was never properly sealed. Homeowners are often surprised to learn that conventional grouts aren’t really waterproof, unless they have had a proper grout sealer applied, and re-applied when necessary.
Once water has made its way past the tile, it contacts whatever tile “substrate” was used. For decades, this substrate was made of mortar, and was “floated” onto the wall, generally onto chicken wire that had been nailed with spacers over some type of building paper. In the San Francisco Bay Area, this building paper was often the same “tar paper” used for roofing, and was also “asphalt-impregnated building paper” that was often used under exterior siding and stucco. These mortar substrates often lasted for decades, and indeed, many still survive throughout the area. Our family home in San Francisco, built in 1936, still has its original Art Deco bathroom wall tile in both the shower and above the bathtub. All of this tile was installed over a mortar substrate.
But mortar substrates require a certain skill level to apply them properly, and many modern tilers prefer to install tile over other simpler (and less costly) substrates, such as cement board and Hardi-board. When properly installed and waterproofed, these newer substrates will last for years, and although not as stable as mortar, they are very stable. But starting in the 1950’s, many builders started using standard drywall as a tile substrate, and over the ensuing years, these tile jobs have mostly failed. My wife and I purchased a home in the San Francisco Bay Area in 1980, and the shower tile was so “mushy” near the shower pan that you could move it by simply pushing on it with your finger. I gutted the bathroom and determined that the tile had been applied directly over 1/2″ drywall, which was completely saturated with water was falling apart.
I replaced the original 1/2″ drywall with a product that was fairly new in 1980, “green-rock.” This 1/2″ drywall was faced with green (rather than white) paper, and did not have the standard gypsum contents present in standard drywall. At the time, lumber yards and the newly introduced “big box” stores were selling this green rock as “waterproof drywall.” You can see where this story is headed, within a few years, this green rock had failed, and the shower needed to be gutted again. Several years went by and green rock was replaced by “purple rock,” which was again touted as waterproof drywall. But neither purple rock nor its predecessor, green rock, were ever meant as tile substrates, and should only be used as backing behind a properly installed tile substrate.
The wall tile depicted in the photo above was present in a home that I inspected last week in the San Francisco Bay Area. The lowest courses of the wall tile were loose, and when I pushed on one of the tiles, it simply fell off the wall, revealing what I suspected was behind it, standard drywall. Once water has made its way past the wall tile and comes into contact with the drywall, the drywall will suck up the water like a sponge, and will then fail. Mold loves paper, and because drywall has a paper face on both its front and back side, it makes a perfect host for mold growth. So when drywall tile substrates fail, it is very common for mold growth to occur.
So the lesson here is straightforward, never allow wall tile to be applied to any type of drywall in a water-setting, which includes shower enclosures and the walls above bathtubs. These installations require proper tile substrates and proper waterproofing. They also require appropriate sealing of the grout, and proper maintenance, which may include re-application of the grout sealer. And if the tile surface is properly maintained, it can last for many years. The tile in our family home is now 84 years old…and is still going strong!
The majority of my mold inspections take place in San Francisco, where most of the neighborhoods were built many decades ago. Starting around the 1920’s, the tiled stall shower became very common in homes and apartments throughout San Francisco, and surprisingly, many of those showers still have their original tiled walls!
Bathrooms are often the first room that I visit on my inspections, both because this is where homeowners often see visible mold, and because this is where my meters often detect moisture problems. The shower depicted in the above photo is actually fairly common in terms of the problems it presents.
The tile is cracked and broken, the grout is missing in places, and mold is visible on both the cracks and the grout. These showers were all built with “custom shower pans,” meaning that the pans built on site, where mosaic tile was installed on a mortar substrate. Under the mortar it was common to “hot-mop” the area (essentially install a hot tar roof). After these shower pans were hot-mopped, both the walls and the pan then received a layer of mortar substrate. This mortar was typically floated over chicken-wire, which was stapled or nailed to some type of building paper.
These tiled showers have lasted for decades, but in almost all cases, the grout joints have failed and water has made its way past the tile and into the mortar substrate. At Bay Area Mold Pros, we use a variety of meters to detect this moisture, including thermal imagers. One of the problems within the mold inspection industry is interpreting just what this moisture means, in other words, we know we have moisture, but has this resulted in mold growth?
The best way to answer this question is through the use of air samples. Although some amount of surface mold is often visible on the grout joints of these old showers, it is oftentimes just that…surface mold. In other words, the moisture that has made its way past the tile may not (yet) be resulting in mold growth that is making its way into the air. That’s where air samples become so important.
Air samples provide a snapshot of the air that’s present in a particular place at a particular time. The cassettes used to collect these samples contain a lab slide. The mold spores attach to the slide, and the lab techs then place these slides under high powered microspores and analyze them. These techs will break out the mold spores present both by number (mold spores per cubic meter is the industry standard), and by mold type. Even though people within the industry often refer to the “species” of mold collected in air samples, the lab actually breaks the mold spores down to the “genus” level, which is more than adequate for the purposes of identifying the severity of a mold growth problem.
The bottom line…these showers need to go! After 50, 60, 70, or even 100 years, the shower has outlived its usefulness, and it’s time to replace it. Many homeowners opt to have seamless panels installed to replace the old tiles walls, thus avoiding the problems associated with grout.
For those who choose to have new tile installed, it’s crucial to have the grout “sealed” after installation, in order to address the issue of water making its way past the grout. Properly installed tile and grout will provide years of service for homeowners, thus avoiding the need to have Bay Area Mold Pros visit your home again.