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A fire and/or liquid seal in a structural wall has a tube-like support extending through the wall with conduits positioned in the support and surrounded by insulation material in the form of silicone foam in one embodiment or packed ceramic fibers in another embodiment with protective shield means b

A fire and/or liquid seal in a structural wall has a tube-like support extending through the wall with conduits positioned in the support and surrounded by insulation material in the form of silicone foam in one embodiment or packed ceramic fibers in another embodiment with protective shield means being clamped to the support and the conduits on the opposite sides of the wall; in another embodiment a layer of silicone elastomer is provided in a tube-like support extending through the wall adjacent a layer of silicone insulating foam surrounding conduits extending through the support in a penetration seal. A method of forming a seal in a horizontal building floor includes pouring of the foam in a tube-like support extending through the floor with the foam held in position by a cover across the lower edge of the opening, liquid elastomer poured on the upper surface of the foam eventually hardens to protect the foam layer but leaks through the foam before hardening to reveal any imperfections in the foam if such are present so that the plugging of such leaks followed by hardening of the liquid elastomer in the imperfection provides a seal that is free from leaks.

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