I'm going to be installing nailing fin vinyl windows using a new construction application in a stucco wall. I'd like to install them properly with gasketed and caulked casing bead around the edges to account for the different coefficients of expansion for the stucco and vinyl windows and prevent cracking.
I can get plastic casing bead, but noticed that for a negligibly greater amount of money, I could get painted galvalume metal J-channel and drip caps intended for roofing. Examples:
http://www.homedepot.com/p/Metal-Sales-Drip-Cap-in-White-4204430/204256751
http://www.homedepot.com/p/Metal-Sales-J-Channel-Flashing-in-White-4227430/204256712
I quite like this option since the metal is bound to hold up better than plastic. I can also get them in non-white colors which could create a nice contrast between the white window and the white stucco.
Is there any reason why this wouldn't work?
Best Answer
Galvalume is a trade name and is not the same material as galvanized steel. Englert, a major roofing manufacturer has a good technical description that specifically cautions against placing Galvalume in contact with mortar.
Believe it or not, the entire construction is not comprised of imbeciles, and building codes actually provide sound guidance in regard to what works.