Hollows

Interior · Floors · printed page 353 (PDF page 354)

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Book index entries

Concrete – Hollows Floor – Concrete – Hollows Hollow Concrete Floors Furnace – Interior Interior Floors

Text in the illustration

you should document any hollow spaces that you find, but you won't be able to determine the size and severity of the voids below the floor
recommend monitoring for localized hollows and further investigation for more extensive ones
foundation wall
hammers or heavy chains are used by specialists to detect hollow spots
floor slab
void
gravel
cross section

Generated explanation

The cross section shows a concrete floor slab between foundation walls supported on footings, with gravel beneath the slab and surrounding soil. A localized depression in the gravel leaves a void beneath the center of the slab. A hammer striking the slab illustrates sounding methods used by specialists to detect hollow spots; the annotation also mentions heavy chains. The notes advise documenting hollows while acknowledging that the size and severity of concealed voids cannot be determined, and recommend monitoring localized hollows and further investigation of more extensive ones.

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