[There is] a shield of the leg of a crib that protrudes through [the ceiling of the lower story of] a house. If the hole is as big as a handbreadth, everything becomes tamei; and if not, we count the way we usually count for [tumah from] a corpse.

The joists of the lower and upper stories of a house have no plaster attached to them and are perfectly aligned one above the other. If there is tumah underneath one of [the joists], [whatever is] beneath it becomes tamei. [If there is tumah] be-tween the lower and upper [joists], whatever is between them becomes tamei. [If there is tumah] above the upper [joist], whatever is directly above it, until the sky, becomes tamei. If the upper [joists] correspond to the space between the lower ones, [and] there is tumah under one [of the joists], whatever is beneath any of them becomes tamei. [If the tumah is] above them, whatever is directly above it, until the sky, be-comes tamei.

[In the case of] a beam that was placed from one wall to another [and] there is tu-mah underneath it: if there is a handbreadth, [it] spreads tumah underneath its en-tirety. If not, tumah penetrates upward and downward. How large a perimeter will have a width of a handbreadth? If [the beam] is round, its perimeter must be three handbreadths. If it is square, [its perimeter must be] four [handbreadths]; because a square exceeds a circle by one quarter.

[In the case of] a pillar lying [on its side] outdoors, if its circumference is twenty-four handbreadths, tumah spreads under its side. If not, tumah penetrates upward and downward.