I say, and with God's success: It is purified by drying in the sun and wind; for Abu Qilabah said: "The dryness of the earth is its purification." And when Abu Dawood narrated in his Sunan from Nafi' that he said: "Ibn Umar was asked about walls that contain excrement and the urine of people and the dung of animals, he said: If the rains have fallen on them and the winds have dried them, there is no harm in praying in them."And everything connected to it is purified accordingly: such as trees, walls, and the covering (i.e., the curtain that is on the roofs made of reeds, and the tiled floors - the built bricks - these things are purified by drying according to the chosen opinion, and it is permissible to pray on them; because they are connected to the ground, they take its ruling, but it is not permissible to perform tayammum with them; due to the condition of purity being a text in tayammum by His saying: {So perform tayammum with pure soil} [An-Nisa: 43]; and because dust is pure and purifying, and by drying after impurity it returns to being pure but not purifying. See: Al-Bahr Al-Ra'iq 1: 237, Al-Wiqayah p. 131, and the explanation of Al-Wiqayah by Ibn Malik Q19/b, and God knows best.