Page 12 - CleanScience_Fall22
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􏰀􏰁􏰂􏰃􏰄􏰅􏰃􏰆 􏰈􏰉􏰀􏰊􏰋 􏰉􏰀􏰂􏰌 􏰍􏰎 􏰀􏰏 􏰐􏰑 􏰒􏰈􏰄􏰆􏰓􏰀􏰀􏰆 􏰔􏰀􏰀􏰄􏰕􏰊􏰋 􏰃􏰖􏰃􏰉􏰗􏰘􏰈􏰄􏰂 􏰈􏰏􏰌􏰃􏰄 􏰐􏰙􏰚 􏰆􏰈􏰛􏰂 􏰀􏰏 􏰃􏰖􏰗􏰀􏰂􏰜􏰄􏰃 􏰍􏰝􏰈􏰁􏰘􏰃 􏰞􏰑􏰟
􏰝􏰒􏰃 􏰒􏰈􏰄􏰆􏰓􏰀􏰀􏰆 􏰔􏰀􏰀􏰄􏰕􏰊􏰋 􏰃􏰖􏰃􏰉􏰗􏰘􏰈􏰄 􏰌􏰒􏰈􏰌 􏰆􏰕􏰆 􏰊􏰀􏰌 􏰃􏰖􏰒􏰕􏰁􏰕􏰌 cupping was rift sawn (Photo 2). The rift sawn method is a premier cut that minimi􏰠es wood distortion in wet or humid conditions.
The degree of cupping varied among the hardwood exemplars and was attributed to the plank cutting method. 􏰡o evidence of cupping was observed among the engineered, laminate or bamboo exemplars. There was no evidence of surface distortion or ply separation among the engineered exemplars.
Mold Growth
􏰢ll wood 􏰔ooring exemplars supported visible mold growth on the bottom after nine days. The earliest growth was observed after 􏰎 􏰙 􏰐 days and was attributed
Experimental Day
1 3 6 9 12 16 20 40 80 140
    Photo 3. Engineered flooring exemplar with prolific fungal mycelium after 142 days.
 Exemplar Type
Hardwood
Hardwood
Hardwood
Hardwood
Hardwood
Hardwood
Engineered
Engineered
Engineered
Engineered
Engineered
Engineered
Engineered
Laminate
Laminate
Bamboo
ID
1,2,3
4,5,6
7,8,9
31,32,33
34,35,36
43,44
10,11,12
13,14,15
16,17,18
19,20,21
22,23,24
28,29,30
41,42
37,38
39,40
25,26,27
Slightly Darker
Slightly Darker
Slightly Darker
Surface stains and slightly darker
mold no observed cupping
      cupping
mold
   No change in surface appearance
     cupping
mold
  cupping
 mold
  cupping
 mold
        mold
cupping
  No change in surface appearance
  Surface mold, same surface appearance
mold
    mold
  No change in surface appearance
  mold
  No change in surface appearance
  mold
  No change in surface appearance
  mold
          Gradual increase in darkening after Day 40 to dark brown at Day 143
mold
Surface staining after Day 8
Surface splitting and mold growth in cracks
      mold
  No change in surface appearance
  mold on edges
  No change in surface appearance
  mold on edges
  No change in surface appearance
  mold
       Table 1. Wood flooring exemplar observations after a 142-day exposure period to damp concrete. The left side of the table identifies the exemplar. Each exemplar was accompanied by two rows of data. The top row showed when cupping and mold growth occurred. The second lower row described changes in the surface appearance.
12 | The Cleaning Industry Research Institute FALL 2022
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