ReadTheSet
Architectural, scale 1/8" = 1'-0"

A-301, Building Sections

Section markers, level datums, floor to floor heights, roof slope.

The drawing

A-301 Building Sections, Millbrook Branch LibraryARCH D sheet, 36 by 24 inches. Drawn at 1/8" = 1'-0" and 1/8" = 1'-0". Use the layer tray and the measure tool below the drawing.123CIRCULATION DESK103CORRIDOR114TOILET108ADULT STACKS202CORRIDOR211TOILET207L1LEVEL 1 0'-0"L2LEVEL 2 14'-0"RBROOF BEARING 26'-0"TPTOP OF PARAPET 29'-0"14'-0"12'-0"3'-0"29'-0"2'-0"40'-0"3A-401Typical exterior wall sectionRoof slopes 1/4 in per foot to drains, see P-1011 BUILDING SECTION 11/8" = 1'-0", cut on the line marked 1/A-301 on A-101ABCDESTAIR 1112ELEVATOR113TOILET108TOILET109ELECTRICAL111MECHANICAL110STAFF WORKROOM107STORAGE106STAIR 1209ELEVATOR210TOILET207TOILET208JANITOR212QUIET ROOM205STAFF OFFICE206L1LEVEL 1 0'-0"L2LEVEL 2 14'-0"RBROOF BEARING 26'-0"TPTOP OF PARAPET 29'-0"14'-0"12'-0"3'-0"29'-0"2'-0"80'-0"3A-401Typical exterior wall sectionRoof slopes 1/4 in per foot to drains, see P-1012 BUILDING SECTION 21/8" = 1'-0", cut on the line marked 2/A-301 on A-101SECTION NOTES1. Both cuts are taken on A-101. Section 1 is cut on the north to south line and looks east, so grid 1 is on the left. Section 2 is cut on the east to west line and looks north, grid A on the left.2. What the cut passes through is drawn heavy and hatched. What is behind the cut is drawn light and is named, not hatched.3. Ceiling lines behind the cut are drawn at the heights tagged on the reflected ceiling plan. They are not structure.4. Levels are stated above the Level 1 finish floor, the project datum, written 0'-0". The same four datums appear on A-201.5. Foundations are shown for reference. See S-101 for sizes and reinforcement, and for the bearing elevation of every footing.ASSEMBLIES CUTRoof: membrane over rigid insulation on steel deck and open websteel joists bearing at 26'-0". Parapet 3'-0" above, see 1/A-401.Level 2 floor: concrete over steel deck on open web steel joists,a 2'-0" structural zone below the finish floor at 14'-0".Exterior wall: brick veneer, cavity, insulation, sheathing and 6 insteel stud, drawn full height at 3/4 in scale on 3/A-401.Slab on grade: 5 in slab over vapour barrier and compacted fill,turned down to a strip footing 3'-0" below the floor, see 2/A-401.08'-0"16'-0"24'-0"32'-0"1/8" = 1'-0"Northgate Design StudioArchitecture and interiorsStructural and civil: Kestrel EngineeringPROJECTMillbrook Branch Library412 Kestrel Avenue, MillbrookMillbrook Public Library DistrictProject number 2026-114ISSUE2026-08-14 Issued for constructionSCALE1/8" = 1'-0"DRAWNNDSCHECKEDQAREVISIONSNODATEDESCRIPTIONSHEET TITLEBuilding SectionsSHEET NUMBERA-301
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Layers on A-301

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How to read this sheet

A section is a cut. Everything the cut passes through is drawn heavy and hatched; everything behind the cut is drawn light and is labelled rather than filled. Learning to see that difference is most of learning to read a section.

Both cuts on this sheet are taken on A-101, and you should find them there before you read anything here. Section 1 is cut on the north to south line and looks east, so grid 1 is on the left and grid 3 on the right, the same order as the west elevation. Section 2 is cut on the east to west line and looks north, so grid A is on the left, the same order as the north elevation. If a section ever seems to disagree with a plan, check which way its arrows look before you assume the drawing is wrong.

Read the building from the ground up. Below the floor is earth hatch, and inside it a strip footing 3'-0" below the finish floor with a frost wall on top of it carrying the wall above. The slab on grade sits at 0'-0", which is the project datum, and every other height on this sheet is measured from it. Fourteen feet up is the Level 2 datum, and just under it is the structural zone, 2'-0" deep, that carries the floor. At 26'-0" is the roof bearing line with the roof structure below it and the membrane above, and 3'-0" higher again is the top of the parapet at 29'-0". The vertical dimension string on the right of each section states those four numbers as three gaps and one overall, and the three add to the overall.

The lighter horizontal lines inside the rooms are ceilings, drawn at the heights the reflected ceiling plan tags. They are not structure. The gap between a ceiling line and the underside of the floor above is the space every duct, pipe and light fixture has to fit into, which is exactly what a section is for.

Rooms behind the cut carry their name and number but no hatch, because you are looking at them rather than through them. Section 1 passes through three rooms on each level; section 2 runs the length of the south band and names eight rooms on Level 1 and seven on Level 2.

Finally, the dashed circles are wall section callouts. Each names a drawing number over a sheet number, here 3/A-401 on both sections, because the wall at the end of each cut is the same typical exterior wall. A-401 draws that piece of wall again at 3/4" = 1'-0", where the layers you can only see as a thickness here become a list you can build from. The other wall section on A-401, 4/A-401, is cut at a window and is called out from A-102.