Was the purpose of the plywood to provide strength to the wall? Also why did you choose MDO versus CDX or othe
by david phillips · More Info
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The ceiling height at the low walls are 16'-0" and at the ceiling 28'-0". The intent of the interior MDO plywood was to offer a smooth flat, structural base to secure the AZEK panels. Since each AZEK panel had a 45 degree bevel edge cut along the outside edge, and installed with a 1/4" space between each AZEK panel, the selection to use of the MDO provided both the smooth base, which offered a flat surface, and would allow the exposed 1/4" space between the panels to be smooth.
If CDX plywood was used, the space between each panel would of have shown the grain and texture of the lesser grade plywood. The use of the plywood was required to allow the AZEK panels to be glued, with marine grade glue then fastened with finished pin nails.
Attempting to secure the panels directly to the studs or to gypsum blue board, would not provide a proper backing behind the panels. The panels are 1/2" thick, and have flex which lead to the decision to utilize a smooth MDO plywood, which would cover the large wall areas, and provide the base for the installation of the AZEK panels.