A 1/2" gap does not sound like a good idea.
Wedi has a sealant like Noble Company's Noble Sealant 150 and Schluter's Kerdi Fix. I would contact Bastian at Wedi and get one of his tech boys to give you a proper detail for this.
You can reach Bastian here.
Bastian Lohmann <bastian.lohmann@wedicorp.com>
JW





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