Such bracing averages one horizontal to each cross, exclusive of guard rails. Obstructions are the main problem indoors. If the obstructions are extremely wide, putlogs may be used to bridge them like this. Sometimes, using straddle braces will solve the problem. In rare cases, tubes and clamps may be the only solution to clearing obstructions.
Stationary scaffolds are the most common and usually the easiest to figure and erect.
When being put up out of doors, about the only problem encountered is uneven ground conditions. The easiest and most practical way to handle this is to start your first frame on the highest point. From this, build your scaffold along the wall, filling in to bring it up to the proper level.