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Writer's pictureMandy Sykes

Buildings Houses out of Wood (or Straw)


I find it interesting that people ask me so often about straw getting moldy, as if all other biobased material that we use to build homes, especially wood, doesn't have the same exact potential. Below is something written about wood, and I added "(or straw)" to prove my point. Just to visually stress that everything you do for an Agriboard Green Building Systems™ house is the same thing you already need to do for a wood house. Read on and enjoy!


Yes, wood (or straw) can get moldy under certain conditions. Mold is a type of fungus that thrives in environments with high moisture levels and poor ventilation. Wood (or straw), being an organic material, provides an ideal surface for mold to grow on when exposed to these favorable conditions.

Mold spores are present in the air and can settle on wood (or straw) surfaces. When moisture is present, either from water leaks, high humidity, or damp conditions, the spores can begin to germinate and form visible mold growth.

Different types of mold can develop on wood (or straw), and they may appear as fuzzy, discolored patches, often in shades of green, black, or white.

The potential for wood (or straw) to get moldy depends on several factors, including:

Moisture: High moisture content in the wood (or straw), either from water leaks or exposure to humid environments, is the primary catalyst for mold growth.

Lack of Ventilation: Poor air circulation around the wood (or straw) can create stagnant conditions that promote mold development.

Organic Matter: Wood (or straw) provides a food source for mold, as it contains cellulose, a complex carbohydrate that the fungus can break down.

To prevent wood (or straw) from getting moldy, it's essential to control moisture levels and ensure adequate ventilation. This can be achieved by:

-Fixing leaks and addressing any water-related issues promptly.

-Using dehumidifiers in areas prone to high humidity.

-Ensuring proper ventilation in spaces like basements, attics, and bathrooms.

-Storing wood (or straw) materials in dry and well-ventilated areas.

-Treating wood (or straw) with fungicides or mold-resistant coatings if necessary (Agriboard™ panels uses bio-based, non-toxic borate).

-Regularly inspecting surfaces and addressing any signs of water issues promptly can help prevent extensive mold growth and potential damage to the wood (or straw).

-Keeping indoor spaces dry and well-ventilated can significantly reduce the risk of mold growth on wood (or straw) and other surfaces within the home or building.


Thank you for reading. Feel free to comment with other building materials that also need to be protected from excessive moisture. (It actually might be easier to make a list of items that don't need protection. It would be much shorter!)




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