Glyph stacking is one of the core ideas of Scrawlgram. It lets writers take much more space-efficient notes which are also more difficult to decode to the untrained eye. That being said, stacking is not required to write anything in SG, and there are many valid ways to stack while writing so there is not a single "right" way to stack a word.

The basic idea of stacking is to arrange consecutive glyphs into columns whenever possible to reduce the horizontal space taken up by the script. There are a few restrictions on how glyphs can be stacked, based on each glyph's class. Every glyph's class can be either Major, Minor, or Column.

1. Every glyph in a column is ordered top-to-bottom.
2. Each column must have no more than one Major glyph. (All single-letter glyphs from A-Z are Major except R, S, and T.)
3. A Column glyph must be the only glyph in its column. (In other words, Column glyphs cannot participate in stacking.)
4. Special care must be taken when stacking {glyph T} above another glyph, since certain stacks can be confused with T-type glyphs. Specifically, the stacks T+C, T+G, T+L, T+ST, and T+TS are forbidden due to visual similarity with glyphs E, V, J, X, and B.
5. A column may not have two consecutive {glyph S} or two consecutive {glyph T}. Instead, use the {glyph SS} or {glyph TT}.

These rules provide many options for the writer when grouping up glyphs. (For example, nearly every minor glyph in a word presents a question of whether to stack it with the preceeding or succeeding glyph.) This leniency is intentional and gives some individuality to different people's writing of SG. One heuristic is to prefer to group up glyphs based on pronunciation (e.g. "H E U R-I-S T-I C" or "H E U R-I ST I C"). There is no need to stack a word the same way every time.

The most common effect of rule 4 is the necessity to separate T and C in the -tch sequence. For example, the word hatch cannot be written "H A T-C H" and must be either written "H A-T C H" or written without stacking at all.