Flooring and Carpeting/deck flooring


I have a covered deck with windows.  We put 3/8" plywood on the floor and now plan to carpet it.  Do we have to crackfill the plywood??

I strongly suggest you do so, but not for the reason you might expect. There is a phenomenon called "filtration soiling" that might crop up.  This is where air moves into or out of the building through cracks, usually around the baseboards.  As it does so, airborne soil particles are filtered out by the carpet pile and trapped there.  The result is a dark line of soil wherever the air movement occurs, and it can be very difficult to clean.  It can also occur where air moves through cracks in the underlying flooring material, through the pad and carpet. In these cases, the cracks between the sheets of plywood are clearly outlined as faint dark lines. Since I suspect there are cracks between the decking boards, your situation would be more prone to this phenomenon.

Filling the cracks would be cheap insurance against this.

Hope this helps

Flooring and Carpeting

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Carey Mitchell


Any question regarding carpet, including specifications, maintenance, installation, regulation.


Retired after 44 years in carpet manufacture, technical and research. Served 33 years as Director of Technical Services for the world's largest carpet manufacturer.

The Carpet and Rug Institute, Technical Chair - 12 years; American Society for Testing and Materials (40 years); American Association of Textile Chemists and Colorists (39 years); Society of Cleaning and Restoration (Board of Directors); US National Textile Research Consortium; Cleaning Industry Research Institute (Board of Directors and founder); Canadian General Standards Board Technical Advisory Committee; The Fiber Society; Alzheimer's Association of NW GA (Board of Directors); Trout Unlimited; Federation of Fly Fishermen

AATCC Review (Textile Chemist and Colorist Journal); Journal of the American Industrial Hygiene Association; International Journal of Flooring Sciences Cleaning Digest; Cleanfax Magazine; Floor Covering Weekly; Floor Covering News; Proceedings of the Technical Conference of the Polyurethane Association; Proceedings of the Symposium on the Science of Cleaning;

BS in Chemistry and Business Administration, University of North Georgia

Awards and Honors
Carpet and Rug Institute, Smrekar Award, 1998; Carpet Industry Leadership Award, 1994; Cleanfax Magazine Person of the Year, 1996; Cleaning Digest, person of the year, 1997; Institute of Inspections,Cleaning and Restoration Certifications award,1997; ISCT Lipscomb Award, 2004

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