Wednesday, June 19, 2024

How To Treat Mold On Plywood Subfloor

Remove From Laminate Flooring

How to repair a moldy subfloor

For laminate floors, it will need to be cared for with minimal chemical use. Chemicals can damage the laminate.

First sweep away any dirt or debris with a broom or vacuum cleaner on the laminate. Mix equal parts of vinegar, rubbing alcohol and water into a bucket.

Spray onto the laminate surface where it is showing. Scrub gently. Rinse and repeat if necessary. When done, be sure to dry the laminate surface completely.

How To Get Rid Of Mold In The Attic: The Basic Guide

Attics are commonly known as mold danger zones. Poor insulation, leaky roofs, and improper ventilation can all ruin your attic.

Most people wont even visit their attic for months or years. This neglect lets a small mold problem swell into a disaster. Get ahead of issues, and know the signs of attic mold before its too late.

Here at IDC, weve dealt with mold in every corner of all types of homes. Thats why weve compiled this master guide on attic mold. Learn everything you need to know about how and why mold forms and what you can do to keep it at bay.

Pay close attention you and your wallet will be thanking this article soon!

Does The Building Need To Be Sterile Is The Object To Reach A Mold Spore Count Level Of Zero

No, the building does not need to be sterile, nor should you seek a “zero mold count”. We have worked on cases where sterility was a necessary cleanup goal: medical facilities such as in operating rooms and treatment rooms. But in a normal office or home there is always some airborne mold along with lots of other airborne particles in building dust.

No washing, sanding, scraping, or other surface cleaning will remove all mold spores from wood where mold was previously found. It is unlikely that most construction materials, even when new, are free of mold spores, nor is”zero mold” a reasonable nor possible objective.

Cleaning moldy framing lumber followed by application of a sealant may be the most cost effective alternative . While lumber replacement with apparently “clean” new lumber may sound appealing, it is likely to be cost prohibitive and in fact may include its own mold when it is unloaded at the work site.

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Remove From Wood Floors

As with hardwood, you may notice warping or staining from the affected areas. It can also seep through the wood, causing it to be deeper than it first seems.

You can then add an 8:1 ratio of diluted bleach and water. Spray on the area and allow it to sit for several minutes. Bleach will prevent further spreading and kill existing mold.

If it seems to have penetrated the wood, you can use a scraping tool or brush to match the depth of growth.

Also Check: Clean Mold From Leather

Will An Enzyme Cleaner Make It Safe To Put Down Brand New Carpeting

Black Mold On Plywood Subfloor

It is indeed the best measure you can take without replacing the subfloor. No one wants new carpeting immediately ruined by old stains resurfacing.

I recommend following the same steps outlined above, in all affected areas. I also suggest letting them dry and watching the spots for several days before you install the new carpeting.

Why so long?

Youll get a better idea of if the enzyme cleaner did its job if you wait a few days. You can even put old towels or doormats over the spot once its dry, as a test.

If the stain manages to rear its ugly head through either of these, it might be necessary to replace some or all of the subfloor.

You can also seal your subfloor before putting down any new flooring. Subfloor sealing will help repel liquid not just the urine variety.

Sealant goes a long way to prevent future stains from setting in.

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Diy Attic Mold Removal Vs Professional Attic Mold Removal

If youre familiar with our blog, you know that the first thing to do when cleaning mold is to fix the moisture problem that led to the mold growth. Until you fix the moisture problem, mold will continue to grow and spread.

Customers often ask, Can I clean the mold myself or do I need a professional? Our answer depends several factors including:

  • how extensive the mold problem is
  • what building materials, furnishings, and belongings are affected
  • where the mold is located
  • whether or not you mind being in confined spaces such as your crawlspace, basement, or attic

Mold is great at hiding in hard to detect locations such as in drywall and insultation. If the area of mold covers more than about 10 square feet, there is a good chance the mold problem is more than an isolated issue. If you smell a musty odor in your home you cant identify, or have health problems associated with mold, its time to call in the professionals.

To get all the details check out our post: Cleaning Mold: DIY vs. Professional.

Especially if you dont live in our service area, you should check out our post: How to Choose a Mold Removal Company. We answer every question you should ask a mold removal company, and give you the details you need to know.

Read Also: Getting Rid Of Mold On Bathroom Ceiling

Causes Of Mold In Your Attic

If you find black spots in your attic and you are thinking it could be harmful black mold, you do not necessarily need to panic.

Mold located on ductwork, on roof decking, trusses, or just about anywhere in the attic is simply a problem of excessive moisture.

Mold will survive in almost any environment that is the right temperature, has moisture , and has something for food .

So, in order to stop the mold we need to stop one of those three things. Moisture is really the only one we can control in our attics.

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Is Plywood Mold Resistant

No type of wood is strong enough to resist or prevent the growth of mold on it. Unless, of course, its engineered or treated to combat the growth of mold spores on it.

Normally, interior plywood has a higher moisture resistance and its planks are held together with highly resistant industrial-strength glues. This protects it from moisture and from bacteria and mold.

However, interior plywood isnt suited for outdoor use. And itll be difficult to stop the growth of mold if you use it for any outdoor installations or fixtures.

In this case, normal plywood isnt mold resistant. But theres a variant thats called Moisture Resistant Plywood, or MR Grade Plywood, which is repurposed to keep it from soaking in moisture. And as you already know, moisture is the number one cause of mold growth.

In reality, MR grade plywood isnt waterproof in itself. Rather, its been designed for use in places that are less prone to moisture. Its more of a decorative type of wood used for aesthetic purposes in residential and commercial projects.

So, to answer the question, plywood will only be mold resistant until it produces or provides the conditions in which mold grows. That is moisture/dampness and lack of ventilation or an airy space.

Do I Have To Replace Moldy Subfloor

3. Discovering mold and cleaning it up

Moldy carpet and other flooring materials must be removed carefully because the process of pulling them up can spread mold spores. The moldy subfloor must also be removed and replaced. Particular care must be taken when cutting into moldy wood because the process sends mold spores flying into the air.

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Why Does Mold Grow In The Attic

Attics in the San Francisco, CA area are ideal places for mold to thrive. Often left unused, the attic is hot, humid and contains an abundant organic food sourcewood sheathing. Mold requires moisture, oxygen and a food source to grow and, the attic provides all three forms of nutrients.

The moisture issues that cause mold growth in the attic may be attributed to any of three scenarios: insufficient or blocked ventilation, roof issues or leaks and the incorrect exhaustion of bathroom fans or dryer vents. If the attic were moisture-free, mold spores would have no chance of surviving.

The ventilation system in the attic normally works by allowing outside air to enter through the soffit vents and escape through the top ridge vents. When the vents are blocked with insulation, however, the warm outside air will stagnate inside, condense on wood, and allow mold to develop.

Roof leaks can lead to localized mold growth. The roof should be examined periodically for leaks. Dryer exhaust vents are designed to direct moisture outside the home. It is important that homeowners ensure the vents lead outdoors and not into the attic, where moisture and mold problems can begin.

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Why Does Black Mold Grow On Floors

It can be tricky to find, as it can grow on subflooring and joists. This means it can grow under carpets, tiles and other types of flooring which can be difficult to spot. It requires a moist environment to grow and thrive, thus it will be in areas that experience moisture. This can include kitchens and bathrooms.

Since it grows from spores, once inside of your home, these spores gravitate toward these naturally damp areas. After they have established a favorable area to grow, it can then spread. Spores are tiny, airborne reproductive cells that mimic the function of seeds. If they are stirred up, they can travel to other areas.

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Treat The Molded Plywood

Treat exposed molded subflooring with a mixture of 1 cup of borax and 1 gallon of water or an EPA-registered mold removal product. Spray the solution on the moldy plywood. You can also soak affected subflooring with a brush broom. Wait 10 minutes, scrub the area, and repeat the process two more times.

Power Tip: Repeated applications allow a treatment to penetrate and kill mold deep in the plywood.

Overview Of Cleaning Mold From Smooth Wood Surfaces

Black Mold On Plywood Subfloor

Flawlessly ample cleansing could be achieved by cleaning or power-washing or media blowing up. Where cleaning a musty surface area, make sure not to spread out musty particles from a musty surface area into a formerly unpolluted surface area by making the error of re-using the very same musty dustcloth again and again on all surface areas. Specialists make use of steri-wiping which makes sure to stay clear of dispersing musty particles by constantly folding and also making use of a tidy side of the rub when transferring to a brand-new area.

Where the mounting lumber is inside your home or otherwise in an area where water splilling is a worry, clean the locations of heaviest mold to get rid of any type of loosened mold from the surface area of the lumber. Unless expert area-containment has actually been established , do not make use of terrible cleansing approaches such as power-washing or sandblasting inside your home, as you will certainly spread out musty particles throughout the structure as well as youll raise the utmost job clean-up price.

Where the mounting lumber is outdoors where water splilling as well as the production of aerosolized mold spores is not a problem, stress clean the contaminated lumber to get rid of surface area mold.

They are on the wood surface areas or could be moved there by wind and also rainfall. Some lumber offers lots of food for the mold as well as mildew and mold to expand quickly.

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Question: Leaks Into Building Walls At Flashing Errors

Kirt said:

We have recently discovered that the builder of our home did not use window sill flashing, and the installation Tyvek was done in such a manner that it does not shed water – it catches it. As a result, there is dry rot and what appears to be black mold in the sheathing. How much sheathing ought to be removed – a 12″ band all around, or what? thanks,

Stacey said:We are replacing the laminate flooring in our bathroom and noticed black mold near our tub on the plywood underneath the laminate we pulled up.

First, what is the best way to clean this mold if we can do it ourselves and second, should we be concerned about any thing growing under the tub?


Nancy use our email found at CONTACT found at page bottom to send us some photos and we can comment on what you are seeing

Mold Found On Wood Subfloor Under Fridge

Dont PanicMost people would rather die than think, and most do Mold if

Maintenance 6 said:FWIW, Sodium Hypochlorite will not only kill mold, but will disolve the glucan bonds that hold the cell walls together. And it only takes 2.4% concentration to do it and less than 5 minutes of dwell time. That means that the mold is not only dead, but has been broken down to it’s component parts to an extent that it is not even considered an allergen. Never exceed 10% concentration of bleach. Breathing chlorine and chloroform compound gases is far more dangerous than any of the stuff that mold produces. Dead mold spores and mold fragments can still be allergens to some people, that is why you need to clean up the mold, then treat it and finally seal it to lock down any stray fragments or spores.


not recommendedAs a general rule, simply killing the mold, for example, with biocide is not enough. The mold must be removed, since the chemicals and proteins, which can cause a reaction in humans, are present even in dead moldMold growth can be removed from hard surfaces with commercial products, soap and water, or a bleach solution of no more than 1 cup of bleach in 1 gallon of water.

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How To Treat Mold On A Plywood Subfloor: Your 10

The signs of mold under hardwood floors, carpets and vinyl are usually the same. You notice dark patches on the floor or a musty smell throughout the room. You pull up a small corner of flooring and expose the problem.

Youre looking at a big DIY project. Start by making sure youve taken care of the moisture source, and then follow these 10 steps for cleaning mold from a plywood subfloor.

Secure The Working Space

Black Mastic Plywood Subfloor Removal

Secure the room by hanging heavy plastic sheets over doors, windows, air registers and vents. Leave one window open so that you can blow contaminated air outside. Position a heavy fan to vent out the window, and let it run constantly while you work.

Power Tip: Be careful to angle the fan so that it doesnt blow directly on the moldy subfloor.

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If Necessary Sand The Wood

These cleaning solutions should take care of your mold problem, but if youve got some stubborn traces left under the surface, you have one last resort: sanding.

  • Use 100-grit sandpaper to rub out the affected portion, taking care not to sand away too much of the surrounding areas.
  • Repeat Step 2 to remove the dust and any loosened mold spores.

Remove Any Carpet That Has Been Damaged

Chances are that if your carpet is moldy, it is not in good shape. Therefore, it is probably better to remove the carpet along with its padding. If you are not sure what you are doing, it is a good idea to hire a restoration contractor to help you remove the carpet because the tacks can be somewhat dangerous.

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S To Clean The Subflooring:

  • Start by thoroughly vacuuming or sweeping the particle board to remove any loose dust and dirt.
  • Next, combine either one part vinegar with one part water or 1 part bleach with 3 parts water in the bucket. Either of these solutions will eliminate the smell and the bleach will also disinfect.
  • Next you will begin washing the floor. To avoid getting too much moisture on the wood it is necessary to work in small areas and use the smallest amount of water possible.
  • Dip just the tips of a stiff broom in the water and brush it along the floor.
  • When you finish with a small area, dry up any remaining moisture with a dry mop or old towels. Remove the moisture as quickly as possible to avoid any damage to the wood.
  • Move onto the next section and repeat washing and drying.
  • When the entire floor is clean, allow it to dry completely.
  • As an optional step, you can apply a sealer to keep any smells that may have not been removed from returning.
  • Apply the oil based paint following the manufacturers instructions.
  • Allow the paint to dry completely before installing new carpet.
  • Black Mold Prevention Tips

    Black Mold On Plywood Subfloor

    Some tips to prevent any further outbreaks include:

    • Finding the original cause of the growth and rectify it.
    • Ensure you have preformed proper removal.
    • Always try any damp areas and do not allow water to collect.
    • Always have proper ventilation in moisture-prone areas.
    • Keep an eye on indoor humidity levels.
    • Check basements, bathrooms, and kitchen sink areas for signs of water damage to prevent growth.

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    How Can You Tell If You Have Mold Under Your Floor

    3 signs of mold under hardwood floors

  • 1- Musty smells. Musty odors permeating your home environment can be a clue that a mold issue is affecting your home.
  • 2- Water damage.
  • 3- Check under the hardwood floorboards.
  • Option #1: Do it yourself.
  • Option #2: Hire a mold remediation specialist.
  • How to Get Rid of Mold Under Flooring

  • Put on goggles, mask and rubber gloves.
  • Pull up all flooring with mold underneath.
  • Mix 1 cup of detergent with 1 gallon of water.
  • Scrub all moldy surfaces with detergent solution.
  • Clean up all water and repair any leaks in your home.
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