וַיִּ֤בֶן אֶת־היצוע [הַיָּצִ֙יעַ֙] עַל־כָּל־הַבַּ֔יִת חָמֵ֥שׁ אַמּ֖וֹת קֽוֹמָת֑וֹ וַיֶּאֱחֹ֥ז אֶת־הַבַּ֖יִת בַּעֲצֵ֥י אֲרָזִֽים׃ (פ)
Er baute den Gang um das ganze Haus fünf Ellen hoch und befestigte ihn an das Haus durch Zedernholz.
Mishneh Torah, The Chosen Temple
There is to be no visible wood structure in any part of the Temple compound, only stones or bricks and mortar. Even [temporary] wooden walkways in the Court are not allowed.