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You may not need a water resistant barrier under lap siding. Check local B.D. How to Choose & Install Housewrap, Tyvek, Typar, HomeWrap, Building Sheathing Wrap - House Wrap - Building Exterior Moisture Barriers
However, the one you picked is problematic because of the cedar siding, unless you back-primed it first:
“Some surfactants, which are chemical
extractives that can leach out of wet
cedar or redwood siding, have the
potential to degrade a plastic housewrap’s
water resistance. However, surfactants
can also degrade asphalt felt.
“There have been problems with cedar
and redwood sidings leaching wood
sugars or surfactants,” says Lstiburek.
“This has occurred with all the plastic
housewraps and the felts. Everything is
affected. But the plastics seem to have
more of a problem than the felts,” he
says. Brad Allshouse from Simplex
agrees that surfactants can affect any
sheathing wrap. “The installer should
back-prime the siding, so the chemicals
can’t leach out,” he says.”
UMass Amherst: Building and Construction Technology » Leaky Housewraps
Be safe, Gary