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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.

"Whether you think you can, or you think you can't, you're probably right."
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