Painting or Staining Fire-Retardant Wood

 

Care & Maintenance

SaferWood fire-retardant lumber and plywood can be coated with a paint or stain, but caution should be taken in choosing the right manufacturer. Not all products adhere to the unique SaferWood finish. Currently, one manufacturer has tested their paints and stains with SaferWood; Armstrong Clark. Provided label instructions are followed, select Armstrong Clark products are warranted to perform as stated on the label when applied over SaferWood lumber and plywood materials.

Flammability of the finish should be considered before any application.

SaferWood brand fire-retardant shakes and shingles are not eligible for such coatings and roofing warranty would be invalidated thereby, without the express written consent of SaferWood.

Armstrong Clark
(800) 565-8211

Disclaimer (Re: Product Appearance and Coatings)

Chemco Inc., the manufacturers, other treaters/licensees, and sellers of lumber and shake and shingle products pressure treated with Chemco fire retardant chemicals, make no representations, provide no warranties express or implied, and assume no responsibility at any time in regard to the appearance of these products whether they remain uncoated or after any coatings / finishing systems are applied to lumber and shakes or shingles in a siding application (any coatings applied to shake and shingles in a roofing application void Chemco’s FR warranty thereon), and as to the performance compatibility of any said system(s) with said product specifically including, but not limited to any of the following:

1) The product appearance and variations therein including as to color(s), stains, and deposits in and on the original treated product and changes thereto that occur thereafter due in part to and during the weathering/aging process;

2) The compatibility, or adhesion and durability of coatings applied to said products. Finish appearance and performance, when applied to FR wood, is dependent on a number of varying factors including most set forth in the partial listing below (see paragraph 4);

3) Before application of any coating(s) to said FR lumber and plywood or shake and shingle roofing product used in a sidewall application, the flammability of the finished product should be considered. THE FIRE RETARDANT CODE CLASSIFICATION OF THE PRODUCT IS BASED ON TESTING OF FR TREATED, NON-COATED/NON-FINISHED MATERIAL.

4) No coatings should be applied to Chemco FR treated shake and shingle roofing material. To do so voids the limited lifetime FR roofing warranty without Chemco’s express written permission.

BE AWARE, exterior wood does not retain its original color, color uniformly, or in a cosmetically expected manner with age and weathering. Additional factors that impact coloration, staining including deposit variations, and appearance effect/performance of any coatings on FR treated products, several of which are the subject of expert debate, in part, include: 1) the wood species, 2) the growing conditions, 3) the season of harvest, 4) the nature of weather including moisture conditions and exposures, 5) the type (i.e. non-filming oil based penetrating stains versus paints including acrylic), the brand/type chemical composition, the coating color, and the type and number, if any, of any stain blocking primers and coatings applied. The U.S. Forests Products Laboratory and American Forest and Paper Association have articles and recommendations on some of these matters regarding un-treated wood, 6) the moisture content at time of application(s) (even wood kiln dried after treatment-KDAT, will not always have a uniform, low enough moisture content for effective coating; moisture exposure at the job site including from humidity should also be considered), 7) the pre-coating surface preparations including any recommended post installation natural drying/conditioning period(s), priming, and preparations between coats, and 8) the extent of extractive bleeding (all wood contains extraneous materials the organic components of which are called extractives including tannic acid - see for example Western Red Cedar Lumber Association website discussions of same at www.wrcla.org, and 9) the FR pressure chemical treatment process itself.

NOT ALL PAINTS AND STAINS ARE COMPATIBLE WITH EXTERIOR FIRE RETARDANT PRESSURE FR TREATED WOOD MATERIAL. THERE ARE MANY DIFFERENT CHEMICAL COMPOSITIONS AMONG THE HUNDREDS OF COATING PRODUCTS (IN PART BECAUSE OF THE VARIETY OF EVER INCREASING AND CHANGING ENVIRONMENTAL REGULATIONS), THAT CAN IMPACT COATING QUALITY AND PERFORMANCE INCLUDING IN AN FR WOOD APPLICATION.

PRIOR TO PURCHASE OF FR WOOD, CONSUMERS SHOULD, AND IT IS THEIR RESPONSIBILITY TO: 1) EXAMINE LIKE TREATED AND AGED PRODUCT IN THE SAME GEOGRAPHICAL ENVIROMENT OF INTENDED USAGE FOR AN IDEA OF COSMETIC COLORATION/STAINING/DEPOSIT VARIATIONS AND PERFORMANCE (INCLUDING PRODUCT COATED WITH THE SAME TYPE, COLOR, AND APPLICATION METHODOLOGY INTENDED BY THE CONSUMER, UNDERSTANDING ALL WOOD IS UNIQUE IN THAT REGARD), 2) TEST THE DESIRED FINISHING SYSTEM ON SAMPLE FR MATERIAL AND EXPOSE TO ACTUAL USE CONDITIONS TO DETERMINE IF THE DESIRED EFFECT CAN BE OBTAINED AND MAINTAINED, AND 3) IF THE DECISION IS TO COAT, TO FOLLOW THE PAINT/STAIN MANUFACTURERS RECOMMENDATIONS REGARDING WHICH OF THEIR COATINGS TO USE WITH FR TREATED WOOD, AND THE APPLICATION METHODOLOGY.

Chemco is a wood fire retardant treater, and not a “coatings” manufacturer or expert. However there are several coating manufacturers who have tested their products on Chemco FR treated lumber products. They make certain limited recommendations, warranties and representations in regard to use of their specified products with Chemco FR treated wood and appropriate application methodology. For your information, and not as a representation of Chemco, or the manufacturers, distributors, and sellers of the FR treated wood described herein, the names and addresses and some general information regarding those coating/stain manufacturers can be found on the Chemco website. The individual manufacturers should be contacted for specific information and details.

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