The 2021 building code raised the adhered facade tile size
On April 20, 2020 the Tile Council said an International Building Code update would let designers use adhered porcelain as large as 48 by 48 inches or 36 by 72 inches on building facades. The International Code Council board certified the change, and the announcement says it takes effect in the 2021 code. The International Masonry Institute and the Tile Council drove the proposal.
The earlier limit
Before that update, adhered porcelain on a facade was limited to 24 inches on one side and 3 square feet per tile. The announcement's examples of the old ceiling are 20 by 20 inches and 12 by 24 inches. The reason given for moving the ceiling is that porcelain is now made very large and as thin as one-eighth inch, while polymer-modified portland cement mortar resists tensile and shear forces better than older mortar.
Not a walkway drainage note
This page is about the size of tile stuck to an exterior wall under that code change. It does not describe slope, a deck detail, or how water leaves a walking surface.
Source
Fetched 2026-10-11 from Tile Council exterior adhered porcelain announcement. The sentences above follow that page. They are not a contractor promise.
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- Backsplash photos
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