The Great Pyramid of Giza is a well known ancient monument on the outskirts of Cairo. Its upper chamber is considered to be the principal chamber of the building, and above this chamber are a series of similarly sized roof chambers, commonly known as the 'relieving chambers' or 'chambers of construction'.

The positions of these roof chambers have never been surveyed due to the almost inaccessible nature of the chambers, accessed via an arbitrarily carved out twisting vertical tunnel which prevents any surveying attempts to connect the roof chambers to the rest of the pyramid's internal architecture. The roof chambers are currently assumed to be directly above the upper chamber of the pyramid only because they have the approximate same internal dimensions as that chamber.

In this paper I show that by examining the red vertical paint marks that are present on these roof chambers' walls, the precise location, shape and orientation of all of the roof chambers can be established relative to the rest of the internal architecture of the building. In so doing I establish that the red paint marks in the roof chambers are architect's marks which are present for the purpose of allowing anyone examining the building to determine the positions of the roof chambers, and that they are not builder's marks that were used during the construction process, as is currently assumed.

As part of the analysis I also determine that the side holes in the gallery room of the Great Pyramid, which to date have never been understood, are a model of the upper roof chambers from which the vertical position of the roof chambers' ceilings can be established, and that these ceilings fall on integer or half-integer cubit altitudes when measure from the base level of the pyramid.