building a panel for an entry door

lundi 20 juillet 2015

hello everyone;
this is my first post to this place, although not my first visit.
i visited many hours learning from you people.
to the point:
i'm building an entry door [80" x 32"].
i'm using frame and panel construction.
i'm using western red cedar [easily available here in Toronto, Canada].
NOTE: this door WILL NOT be directly exposed to rain, it'll be inside an enclosed porch accessed into through an in - swing storm door.
stiles and top rail are built using 2"x6" [which have already been properly planed and jointed]; bottom rail is a bit wider [glued to have a 9.5" that also planed and jointed].
panel will be built using five 1"x6" planks, totaling a panel with 20.625" visible.
i have already planed and jointed these planks.
someone suggested to me to glue the panel planks but ALSO use splines between adjacent planks, all along.
i am figuring out grooves 3/16" wide, 5/8" deep and splines 5mm thick 1" of a plywood Home Depot sells (they call it Brazilian Birola)(?).
now the question:
IS IT really necessary? each plank will be about 68" long (making allowance), and i'm thinking that the likelihood of an error is considerable.
given that there is NOT direct exposure to rain, and given that allowance for lateral expansion will be taken care by the spaceballs inside the frame, so i wonder of splines [that long] will be necessary.
one way or the other, final assembly of panel will be made with six pipe clamps [alternately positioned: top - bottom] and cauls between them to prevent the cupping under clamps' pressure. everything laid on top a flat table.

all comments/ suggestions / alerts / warnings will be kindly appreciated.

danielr.


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