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Unread 10-27-2004, 06:15 AM   #26
Bill Vincent
Tile Contractor
 
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Join Date: Jan 2003
Location: Bridgton, Maine
Posts: 8,631
Absolutely. AS well as having L/720 along the framing, you also need it between. Double layering is a must. Even if using a membrane, all membranes, including Ditra, require that the floor meet the deflection standards PRIOR to installation of the membrane.
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