Quoting%20commentary for Eruvin 1:3

הַקּוֹרָה שֶׁאָמְרוּ, רְחָבָה כְּדֵי לְקַבֵּל אָרִיחַ. וְאָרִיחַ, חֲצִי לְבֵנָה שֶׁל שְׁלֹשָׁה טְפָחִים. דַּיָּה לַקּוֹרָה שֶׁתְּהֵא רְחָבָה טֶפַח, כְּדֵי לְקַבֵּל אָרִיחַ לְאָרְכּוֹ:

The aforementioned "korah" must be wide enough to receive an ariach (a small brick) [so that a permanent structure could be built upon it.] And an ariach is half a brick of three tefachim, [so that an ariach is a tefach and a half wide.] It is sufficient that the korah be a tefach wide to receive an ariach along its length. [This is what is meant: If the korah is a tefach wide, the additional half tefach by which the ariach is wider (the ariach being a tefach and a half) can be plastered the width of a finger on either side, so that it will be wide enough to receive an ariach. Thus is it explained in the gemara.]

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