Building Inspection, Diagnosis & Repair Info

Stained clapboards (C) Daniel Friedman Extractive Bleeding Stains on Building Exterior Walls

Extractive bleeding stains on wood siding:

Building siding extractive bleeding stain cause diagnosis & cure or prevention.

This article series catalogs the different types of stains or discolorations found on building exterior surfaces: walls, roof, trim, walks, patios, decks, etc.

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Extractive Bleeding Stains or Marks on Building Siding, Walls, Trim

Cause & Prevention of Extractive Bleeding Stain Problems on Building Exterior Siding

Stained clapboards (C) Daniel FriedmanOur stained clapboard siding photo shown here is a closeup of stains found on the home shown in our photograph just above.

As reported in Best Practices Guide to Residential Construction (Steve Bliss, J Wiley & Sons) :

Excess moisture in wood species such as cedar, redwood, Douglas fir, and mahogany can dissolve the natural tannins in the wood and cause them to migrate to the surface, leaving a reddish-brown stain on the finish.

Sealers and stain-blocking primers help to minimize this problem but do not always eliminate it.

If staining occurs, the first step is to eliminate the moisture problem.

Then, if the extractive bleeding is mild, remove the stains with a mild detergent and water. More severe cases will require cleaning with an oxalic acid solution.

Carefully follow the manufacturer’s instructions when using oxalic acid, as the bleaching solution will harm plants and may bleach existing finishes on siding, trim, and other woodwork.

After washing, the oxalic acid must be thoroughly rinsed with clean water and the wood dried before finishing or refinishing. I

f the extractive bleeding has been allowed to bake in the sun, it may have hardened and be difficult to remove. In this case, you will need to apply a stain-blocking primer before refinishing.

Our clapboard staining photo below left shows staining in an inside corner below a roof valley where we suspect there was gutter spillage or leakage down the wall, exacerbating siding staining.

Look at the edge of the stains and you'll see some extractive bleeding.

[Click to enlarge any image]

Stains and stain prevention on red-cedar siding are discussed separately

at STAINS on RED CEDAR SIDING

Stained clapboards (C) Daniel Friedman

Extractive Bleeding Stains - Research / References


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Citations & Reviewers

In addition to any citations in the article above, a full list is available on request.

  • [1] Hugh Cairns, RHI (Registered Home Inspector), Subject 2 Inspections, Mr. Cairns is a licensed professional home inspector and thermographer serving Kelowna, Vernon, and Penticton, British Columbia. Tel: 250.808.5777, Email: okanagan@subject2homeinspections.com
  • Analysis of Modern Paints, Thomas J.S. Learner, Research in Conservation, 2004 ISBN 0-89236-779-2 [Chemistry of modern paints, overview of analytical methods, pyrolysis-gas chromatography signatures of basic modern paints and their constituents, Fourier transform infrared spectroscopy for paint analysis, direct temperature-resolved mass spectrometry, and analysis in practice - technical reference useful for forensic paint science, focused on art works -DF]
  • Building Pathology, Deterioration, Diagnostics, and Intervention, Samuel Y. Harris, P.E., AIA, Esq., ISBN 0-471-33172-4, John Wiley & Sons, 2001 [General building science-DF - ** Particularly useful text **
  • Dampness in buildings, Diagnosis, Treatment, Instruments, T.A. Oxley & E.G. Gobert, ISBN 0-408-01463-6, Butterworths, 1983-1987 [General building science-DF]
  • Certainteed Weatherboard fiber cement siding and trim products - see certainteed.com/ or see certainteed.com/resources/sidingandtrimspecsheet.pdf
  • MASONITE WOODRUF® ROOFING OR MASONITE OMNIWOOD® SIDING LAWSUIT SETTLEMENT NOTICE - PDF file
  • Paint Handbook: testing, selection, application, troubleshooting, surface preparation, etc., Guy E. Weismantel, Ed., McGraw Hill Book Company, 1981, ISBN-10: 0070690618, ISBN-13: 978-0070690615, [Excellent but a bit obsolete paint theory and practice, also a bit light on field investigation methods, out of print, available used-DF]
  • Paint and Surface Coatings, Theory and Practice, R. Lambourne & T.A. Strivens, Ed., Woodhead Publishing Ltd., William Andrew Publishing, 1999 ISBN 1-85573-348 X & 1-884207-73-1 [This is perhaps the leading reference on modern paints and coatings, but is a difficult text to obtain, and is a bit short on field investigation methods - DF]
    R. Lambourne was in the Research Department at ICI Paints Division and the Industrial Colloid Advisory Group, Birstol University, UK.
  • Seeing Through Paintings, Physical Examination in Art Historical Studies, Andrea Kirsh, Rustin S. Levenson, Materials in Fine Arts, 2000 ISBN 99-051835 [ forensic science, technical reference, focused on art works - DF]
  • Sealants, Durability of Building Sealants (RILEM Proceedings), J.C. Beech, A.T. Wolf, Spon Press; illustrated edition (1995), ISBN-10: 0419210709, ISBN-13: 978-0419210702
  • Soiling and Cleaning of Building Facades (RILEM Report), L.G.W. Verhoef (Editor), Routledge; 1 edition (November 3, 1988), ISBN-10: 0412306700, USBN-13: 978-0412306709

    The report of a comprehensive investigation by RILEM which examines all aspects of the cleaning of facades, subject to soiling by both biological and non-biological agencies. The contributors are
    international authorities working in this field giving essential advice to all those who need to know how to approach the problems connected with the soiling and cleaning of building facades.
  • Staining, Prevention of Premature Staining in New buildings, Phil Parnham, Taylor & Francis; 1996, ISBN-10: 0419171304, ISBN-13: 978-0419171300

    The appearance of ugly staining early in a buildings life, ruins an otherwise pleasing appearance, tarnishes the image of the owners and gives rise to costly refurbishment works. In this book Phil Parnham raises a number of questions that should be considered whenever a new building is being designed or built.

    These are:

    * why has staining become so prominent;

    * what causes premature staining; which parts of new buildings are likely to be affected;

    * how can it be avoided?

    By using a number of highly illustrated case studies, the author answers these questions and ends by suggesting measures that should be taken by all design and construction professionals to prevent premature staining.
  • In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested

    CONTINUE READING or RECOMMENDED ARTICLES.

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