wall
Explanation:
In theory a pignon is a wall with a triangular section at the top. In practice these days, it is an "end wall", with no pitched roof above and no windows, as opposed to "main walls" or "frontages". No point in testing wall coating/filling products on walls full of windows, you want a "full wall".
I see little point in calling it a "gable" or even "end wall". All it is is a "wall". I've made the comment previously that French refers to specific types of wall (voile, refend, pignon, etc.) where in many if not most cases all that is needed in English is "wall".
de façade tells you it's an external wall, but a) pignon tells you that anyway and b) so does the context, I imagine.
| xxxBourth
Local time: 09:56
Works in field
Native speaker of:  English
PRO pts in category: 535
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The translation workplace 
peer agreement (net): +5