inspiration gallery summer2016

Inspiration Gallery

Get ready to be amazed with these inspiring images of log home interiors and exteriors.

Click Here
featured product 4

Featured Product

Perma-Chink is a flexible, textured log home chinking that seals the open gaps between logs to eliminate heat loss and air infiltration. Even though it looks and feels like traditional mortar, it's not. Perma-Chink is a pure acrylic that adheres to logs and stretches to maintain a tight seal by following log movement.

Click Here

DIY Section

Find How-Tos, Tech Tips, and Videos regarding our family of products.

Click Here



Restoration products to remove old finishes and make dirty or weathered wood look like new.



Special purpose wood preservatives to protect against termites, insects, wood rot, mold and mildew.

Stain and Finish


Beautiful wood finishes protecting your log home and bringing out the beauty of your exterior, interior, decks and millwork.

Seal and Chink


Flexible log home sealants for every weather-proofing job around your chinked or timber style log home.

Preventing Mold Growth on Bare Wood

Mold and mildew (actually another name for mold) are colonies of living organisms that can grow on the surface of many materials, including wood. Their color may range from white to black, with just about every color in between. If the discoloration is green, it’s probably algae, a plant, since molds and mildews do not contain green chlorophyll.

Like most living organisms, molds require air, water, and a food source for survival. Bare wood is quite susceptible to mold growth since the porous surface provides lots of places for spores to germinate and many of wood’s nutrients are available as food. This is especially true for newly harvested wood that still contain a high sugar content. In addition, bare wood absorbs water, thus supplying the moisture these organisms require.

Although it is fairly easy to remove mold from bare wood surfaces (Wood ReNew™ does an excellent job), preventing its growth on green logs in particular can be somewhat of a challenge. Thanks to the internet, one popular misconception is that borate treatments will prevent the growth of surface molds on wood. This is NOT TRUE! Although the presence of borates will inhibit the growth of some types of surface molds, there are other types that actually thrive on borate treated wood.

Borates are quite effective against wood decay fungi, but surface molds are very different from decay fungi, and it takes other methods of control to prevent their growth. When it comes to preventing the development of mold on wood, the best and most effective approach is to provide a dry environment. Molds cannot survive in dry conditions, so if the logs are stored under cover with lots of air flow around them, chances are that mold will not grow on them.

How can the formation of mold be prevented when ideal storage conditions aren't practical? There are some chemical treatments for bare wood that will kill existing mold colonies and prevent mold growth for several months.

One of the more commonly used products is didecyl dimethyl ammonium chloride, commonly referred to as DDAC. It works well, and several years ago we used to sell a brand of it named Britewood XL. However, the one downside of DDAC is that it is quite toxic and corrosive to skin. The US EPA signal word for containers containing DDAC is a well-deserved DANGER, and it may not be available in all areas.

Another chemical used for killing and preventing mold growth is chlorothalonil. At low concentrations it’s commonly used for preventing fungal growth on peanuts and potatoes, as well as being a fungicidal additive to paints and stains. Sostram Corporation makes a chlorothalonil product named Mold-Ram that inhibits surface mold and mildew growth on wood, wallboard, concrete, and masonry (cinder) block. It carries a WARNING label, and it, too, may not be available everywhere.

Although there are several other products available for controlling mold, the last one we’ll cover is thiabendazole, the active ingredient in Stay Clean™. Although not very effective for killing a heavy coat of mold already growing on wood, it does a pretty good job preventing the re-growth of mold on a clean surface. The major advantage of thiabendazole is that it’s not very toxic and carries a CAUTION label, the lowest US EPA toxicity classification.

So is there a role that a Perma-Chink Systems product can play to prevent the growth of mold on bare wood other than one of our complete finish systems? If a manufacturer or contractor wants to protect their logs at the mill or on the job site during construction, they can apply a coat of Prelude™ that has been dosed with Stay Clean or an equivalent product that’s labeled for adding to water-based paints or stains. This will help prevent the growth of mold on top of the Prelude film. The limitation of this combination is that it must be applied to a fairly clean surface, since it may not kill all of the mold colonies that are already present. However, it offers some definite advantages over those products that just eliminate and prevent mold.

First, since Prelude contains UV Boost, it will help prevent surface graying due to sun exposure. Second, the Prelude film will keep the surface cleaner during transport and construction. And third, it will help regulate the drying process which, to some degree, should lessen initial checking and fissuring. We already have some manufacturers using this system and they are quite pleased with the results.

Last modified on Monday, 16 July 2018 23:15

Free Product Catalog

catalog2018Order a Free Catalog

To receive a PCS catalog by mail, simply add to your shopping cart and check-out.

PCS Connections Newsletter

pcsnews jun2017View Monthly Newsletters

Click here to view past issues of PCS Newsletters

Your Wood Care Resource

Although Perma-Chink Systems (PCS) is the largest manufacturer of log home chinking and sealants, we make a complete line of quality wood care products. Wood Finishes, Wood Preservatives, Wood Cleaners and Restoration Products all are Made in the U.S.A. 

In 1981 PCS introduced flexible chinking to the log home industry to replace what was the standard at the time - concrete mortar. This revolutionary product, Perma-Chink Log Home Chinking, looked like authentic mortar but stretched and flexed to accommodate log movement while maintaining a tight seal for the life of the house.

Perma-Chink Systems is the log home building industry's trusted partner for the tightest, greenest, and most impeccably finished log homes in the world.


proudly made in usa

Workshop & Log Home Show Schedule

Jan 31-Feb1 | Applicator-Only Workshop | Nashville, TN


Date & City, State

Workshop & Location


January 4-6

Log Home & Timber Show


Allentown, PA

Allentown Fairgrounds


January 18-20

The Log & Timber Home Show


Nashville, TN

Music City Center


January 25-27

Log Home & Timber Show


Columbus, OH

Ohio Expo Center


February 8-10

Log Home & Timber Show


Pittsburgh, PA

Monroeville Convention Center


February 22-24

The Log & Timber Home Show


Kansas City, MO

KCI Expo Center


February 23

PCS - Homeowner Workshop


Knoxville, TN

Knoxville Store


February 23

PCS - Homeowner Workshop


Petersburg, PA

Pennsylvania Store   ***Limit of 25 Attendees***


March 2-3

The Log & Timber Home Show


Atlanta, GA

Infinite Energy Forum


March 8-10

Log Home & Timber Show


Syracuse, NY

The Oncenter Convention Center


March 9

PCS - Homeowner Workshop


Stevensville, MT

Montana Store


March 16

PCS - Homeowner Workshop


Rifle, CO

Rifle Store


March 22-23

The Log & Timber Home Show


Minneapolis, MN

Earle Brown Heritage Center


March 29-31

The Log & Timber Home Show


Chicago, IL

Kane County Fairgrounds


Monthly Special

loyal 119 cc

Subscribe via Email

Welcome to Perma-Chink Family!

Receive News and Loyal Customer Offers

Project Spotlight

  • Lifeline Ultra-7 stands out as THE top-of-the-line, long-lasting finish. Take a look at our tutorial video on proper application technique.

    Project Spotlight