andersen patio door flashing question

Old 08-07-07, 11:06 AM
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andersen patio door flashing question

Were installing an Anderson frenchwood patio door. We are ready to install the frame in the rough opening and and are using Bituthene for the vapor barrier, but was wondering if it we can install the sill directly on the plywood, or if we should install aluminum flashing first. Can the Bituthene be used in lieu of the flashing? i.e. can the Bituthene can be tacked all around the rough opening including the sill and can the sill of the frame be attached to the Bituthene with caulking.

Old 08-07-07, 02:09 PM
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Todd: welcome to the forums! As with any non rigid member, I would opt to protect its weather proofing properties with flashing. The membrane will do a fine job, but if you allow it to become damaged it won't be worth the money you spent on it. Bottom line, go ahead and use flashing, then the membrane. Use a good silicone between it and your door frame on the bottom to prevent water infiltration from blowing rain. Turn the membrane up on the side walls of the door frame, too.

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