FHB Logo Facebook LinkedIn Email Pinterest Twitter X Instagram Tiktok YouTube Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Restoration
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Discussion Forum

Discussion Forum

Is this black mold I see?

plainview | Posted in General Discussion on July 21, 2008 06:25am

Hello, I tore out some plaster today, and found some strange-looking substance on the back of the lathe boards. Pictures attached.

Anyone have thoughts on whether it’s black mold? If so, what precautions should I take? (I always wear a particle mask when doing demo).

 

Reply
  • X
  • facebook
  • linkedin
  • pinterest
  • email
  • add to favorites Log in or Sign up to save your favorite articles

Replies

  1. peteshlagor | Jul 21, 2008 06:26am | #1

    You got life insurance?  Is it paid up?

     

  2. brucet9 | Jul 21, 2008 06:37am | #2

    You can buy a mold test kit at big box hardware stores. $11 at Ace Hardware or big box stores plus $30 for analysis and report.

    I tested a similar-looking growth and amazingly enough the results came back as mushrooms!

    BruceT
  3. User avater
    CapnMac | Jul 21, 2008 09:33am | #3

    have thoughts on whether it's black mold?

    It certainly apprears to be a fungal growth that is black in color.

    It does not appear to be the mold that Dr Blacke discovered, the one that gives off spore which causes a noxious histological reaction in persons exposed to it.  You want full coverage and powered respiration when dealing with Blacke('s) mold.

    Could be plebian mildew, too--not that insurance companies seem to make any distinction between deadly flora and everyday molds found under leaves and in grass and the like.

    Occupational hazard of my occupation not being around (sorry Bubba)
    1. JeffinPA | Jul 23, 2008 12:09am | #8

      I am pretty layza faire (sp) about mold but my daughter was hyper sensitive to those molds that grow in wood piles in the woods and etc for about 3 formative years.

      Some people dont do well with the common molds either.  (she eats blue cheese like it is candy so some molds are nbd but others she had azmathatic (sp) reactions to.

      1. Biff_Loman | Jul 23, 2008 12:34am | #9

        1. Laissez-faire, literally: let do; i.e., allow to happen.2. asthmaticI minored in English.

        1. JeffinPA | Jul 23, 2008 01:18am | #10

          Thanks Bill

          I am a classic engineer.  Got good enough grades on my verbals on SAT's to get to college and was thankful for that.

          Got a lot better over the years in corporate america and because I read a lot but not good yet.

          Learn something every day.

           

          Thanks

          I will work on remembering spelling of both!

  4. Southbay | Jul 21, 2008 07:26pm | #4

    Yes. It certainly appears to be mold. Avoid breathing it. Avoid disturbing it as much as possible. Try to remove the sheetrock in large pieces and take directly to the dumpster. Wear a respirator if you are going to be exposed to any significant airborne levels, or if you have a sensitivity to mold.

    You don't need to test it. It matters little what color the mold is. Any mold in significant concentrations may affect a person.

    Stachybotrys species are sometimes referred to by some as "black mold". We do not use the term. These molds are common environmental organisms. Certain species of mold, such as Stachybotrys species, are capable of producing chemicals called mycotoxins. While little is known about mycotoxins, research and case studies have suggested exposure to mycotoxins can cause human health effects.

    Once cleaned or removed, it is imperative that the moisture source be eliminated, as continued moisture load could result in the redevelopment of mold.

    1. plainview | Jul 22, 2008 06:21pm | #5

      Is mold similar to asbestos, in the sense that it does not pose a problem if sealed and left undisturbed? The water leak, if it still exists, originates in the bathroom and will be eliminated shortly. The space has hot water heat so there are no air ducts to worry about.I would prefer to leave it be if this is an option.

      Thanks.

      1. Southbay | Jul 23, 2008 02:27am | #11

        No, not really. Asbestos, if securely sealed and undisturbed, is truly the miracle mineral. It can't harm you unless you breath it or eat it. Molds can release toxins that could probably permeate a sheetrock enclosure. Depending on the sensitivity of an individual, that could negatively affect persons.Though I'm not overly concerned with mold, I would use some precautions and clean it before closing the wall. A bleach or Lysol solution should work, as long as you allow it to fully dry afterward.

  5. User avater
    PeteDraganic | Jul 22, 2008 08:05pm | #6

    Avoid the hysteria... all black mold is not the deadly black mold.  Matter-of-fact, I think that very little of it is.

    Furthermore, squirt a little bleach on it and the surrounding area with a spray bottle.  It will kill it and its spores.

    Otherwise, the spores are practically everywhere and any amount of moisture can bring them to life.

     

    I refuse to accept that there are limitations to what we can accomplish.        Pete Draganic



    Edited 7/22/2008 1:07 pm ET by PeteDraganic

  6. User avater
    rjw | Jul 22, 2008 08:12pm | #7

    The term "black mold"is about as specific as "green vegetation"

    Read up here: http://www.epa.gov/mold/


    Remember Mary Dyer, a Christian Martyr (Thank you, Puritans)
    http://en.wikipedia.org/wiki/Mary_Dyer


    May your whole life become a response to the truth that you've always been loved, you are loved and you always will be loved" Rob Bell, Nooma, "Bullhorn"

  7. User avater
    Jeff_Clarke | Jul 23, 2008 06:38am | #12

    Don't use bleach - it doesn't work.   One chemical of choice is DBAC (Diethyl Benzyl Ammonium Chloride

    http://www.traskresearch.com/mold.htm

    Jeff



    Edited 7/22/2008 11:44 pm ET by Jeff_Clarke

  8. k1c | Jul 23, 2008 09:23pm | #13

    Check "greenbuilding.com" for a perspective on mold and removal.  Also check your house, from roof to foundation, for water.  Keep in mind ice dam, gutter, distance between siding material and ground, ground slope, etc.  Hope this helps.

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

  • Business
  • Code Questions
  • Construction Techniques
  • Energy, Heating & Insulation
  • General Discussion
  • Help/Work Wanted
  • Photo Gallery
  • Reader Classified
  • Tools for Home Building

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

Fast, Accurate Wall Framing

A rear addition provides a small-scale example of how to frame efficiently.

Featured Video

SawStop's Portable Tablesaw is Bigger and Better Than Before

The 10-in. Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws.

Related Stories

  • Podcast Episode 693: Old-House Hazards, Building Larsen Trusses, AI in Construction
  • FHB Podcast Segment: Finding Hazardous Materials in a Fixer-Upper
  • A Classic Paint Sprayer Gets a Thoughtful Refresh
  • Podcast Episode 692: Introduction to Trade Work, Embodied Carbon, and Envelope Improvements

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Fine Homebuilding Magazine

  • Issue 332 - July 2025
    • Custom Built-ins With Job-Site Tools
    • Fight House Fires Through Design
    • Making the Move to Multifamily
  • Issue 331 - June 2025
    • A More Resilient Roof
    • Tool Test: You Need a Drywall Sander
    • Ducted vs. Ductless Heat Pumps
  • Issue 330 - April/May 2025
    • Deck Details for Durability
    • FAQs on HPWHs
    • 10 Tips for a Long-Lasting Paint Job
  • Issue 329 - Feb/Mar 2025
    • Smart Foundation for a Small Addition
    • A Kominka Comes West
    • Making Small Kitchens Work
  • Issue 328 - Dec/Jan 2025
    • How a Pro Replaces Columns
    • Passive House 3.0
    • Tool Test: Compact Line Lasers

Fine Home Building

Newsletter Sign-up

  • Fine Homebuilding

    Home building tips, offers, and expert advice in your inbox.

  • Green Building Advisor

    Building science and energy efficiency advice, plus special offers, in your inbox.

  • Old House Journal

    Repair, renovation, and restoration tips, plus special offers, in your inbox.

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters

Follow

  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X
  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences
  • About
  • Contact
  • Advertise
  • Careers
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2025 Active Interest Media. All rights reserved.

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

  • Home Group
  • Antique Trader
  • Arts & Crafts Homes
  • Bank Note Reporter
  • Cabin Life
  • Cuisine at Home
  • Fine Gardening
  • Fine Woodworking
  • Green Building Advisor
  • Garden Gate
  • Horticulture
  • Keep Craft Alive
  • Log Home Living
  • Military Trader/Vehicles
  • Numismatic News
  • Numismaster
  • Old Cars Weekly
  • Old House Journal
  • Period Homes
  • Popular Woodworking
  • Script
  • ShopNotes
  • Sports Collectors Digest
  • Threads
  • Timber Home Living
  • Traditional Building
  • Woodsmith
  • World Coin News
  • Writer's Digest
Active Interest Media logo
X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Project Guides
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Online Learning

  • Courses
  • Project Guides
  • Reader Projects
  • Podcast

More

  • FHB Ambassadors
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • X
  • YouTube
  • instagram
  • facebook
  • pinterest
  • Tiktok

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

Enjoy unlimited access to Fine Homebuilding. Join Now

Already a member? Log in

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in

Privacy Policy Update

We use cookies, pixels, script and other tracking technologies to analyze and improve our service, to improve and personalize content, and for advertising to you. We also share information about your use of our site with third-party social media, advertising and analytics partners. You can view our Privacy Policy here and our Terms of Use here.

Cookies

Analytics

These cookies help us track site metrics to improve our sites and provide a better user experience.

Advertising/Social Media

These cookies are used to serve advertisements aligned with your interests.

Essential

These cookies are required to provide basic functions like page navigation and access to secure areas of the website.

Delete My Data

Delete all cookies and associated data