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Architectural, scale As noted

A-401, Wall Sections and Details

Assembly layers, detail callouts, flashing, large scale dimensioning.

The drawing

A-401 Wall Sections and Details, Millbrook Branch LibraryARCH D sheet, 36 by 24 inches. Drawn at 3/4" = 1'-0" and 3/4" = 1'-0" and 3/4" = 1'-0" and 1 1/2" = 1'-0" and 1 1/2" = 1'-0" and 1 1/2" = 1'-0" and 1 1/2" = 1'-0". Use the layer tray and the measure tool below the drawing.1A-4013'-0"12'-0"Drained and vented air cavity2 in rigid insulation, continuous6 in steel stud at 16 in on centreBrick veneer on stainless tiesConcrete on steel deck on open web steel joists2A-4013'-0"2'-6"Finish grade5 in slab on vapour barrier and compacted fillContinuous strip footing, see S-1013 TYPICAL EXTERIOR WALL SECTION3/4" = 1'-0". Drawn with break lines: the wall runs on above and below.5A-4016A-4015'-0"3'-0"Steel angle lintel, prime and paintPrecast sill, wash and drip1 in insulating glazing in an aluminium frame4 WALL SECTION AT WINDOW3/4" = 1'-0". Cut at the Study Room A window on Level 2.3'-0"Prefinished metal copingTreated wood blockingMembrane turned up and terminated1 PARAPET CAP1 1/2" = 1'-0"0'-5"2'-6"0'-6"Through wall flashing with weeps at 24 inVapour barrier over compacted fillFooting reinforcement, see S-1012 SLAB EDGE AT FOOTING1 1/2" = 1'-0"1'-2" MINHead flashing with end damsSealant and backer rod5 WINDOW HEAD1 1/2" = 1'-0"0'-4"Sill flashing turned upPrecast sill, wash and drip6 WINDOW SILL1 1/2" = 1'-0"READING THESE DRAWINGS1. The two wall sections are at 3/4" = 1'-0" and the four details at 1 1/2" = 1'-0", so a detail is twice the size of the wall section it was taken from, and the wall section is six times a plan.2. A break line means the drawing continues, not that the wall stops.3. Layers are drawn outside face first. Brick, cavity, insulation, sheathing, stud, gypsum board. Every leader names one of them.4. The bubble in a wall section names the detail that enlarges it. 3/A-401 is called out on A-101, A-102 and A-301; 4/A-401 on A-102 and A-301; 1, 2, 5 and 6 are called out on this sheet.5. Hatch tells you the material. Earth, concrete, brick, insulation, wood, steel and gypsum board each have their own pattern on G-002.EXTERIOR WALL, OUTSIDE FACE INWARD1 Brick veneer on stainless ties2 Drained and vented air cavity3 Rigid insulation, continuous4 Exterior sheathing and air barrier5 Steel stud at 16 in on centre6 Gypsum board, painted01'-0"2'-0"3'-0"4'-0"3/4" = 1'-0"00'-6"1'-0"1'-6"2'-0"1 1/2" = 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 constructionSCALEAs notedDRAWNNDSCHECKEDQAREVISIONSNODATEDESCRIPTIONSHEET TITLEWall Sections and DetailsSHEET NUMBERA-401
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Layers on A-401

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How to read this sheet

This is the sheet where a wall stops being a thickness and becomes a list of materials. Everything on it is drawn at least six times the size of the same wall on a floor plan, which is the whole reason the sheet exists.

There are two scales here and the title block says both. The two wall sections on the left are at 3/4" = 1'-0". The four details on the right are at 1 1/2" = 1'-0", twice as large again. Never measure across the sheet without checking which drawing you are in: a quarter inch of paper is four inches of building in a wall section and two inches in a detail.

Wall section 3 is the typical exterior wall, drawn from the bottom of the footing to the top of the parapet. It cannot fit on the paper at this scale in one piece, so it is drawn in two parts with a break line at each cut. A break line does not mean the wall ends. It means the middle of it is the same as what you can see and has been left out to save paper.

Read the assembly outside face first. Brick veneer, then a drained and vented air cavity, then continuous rigid insulation, then sheathing with the air barrier on it, then the 6 in steel stud, then gypsum board. Every one of those layers has a leader naming it, and the same six layers are listed in order at the right of the sheet. The leaders are the point of the drawing: a hatch pattern tells you a material family and a leader tells you exactly what to buy.

Wall section 4 is the same wall taken at a window, cut at the Study Room A window on Level 2. Two bubbles sit on it, 5 at the head and 6 at the sill, and each one names a detail on this same sheet where that piece is drawn again at twice the size. That is how a callout works whether it points at another sheet or at the drawing beside it: the number over the sheet, the number first.

The four details do the same job at the four places a wall assembly has to change: where it stops at the top, where it meets the ground, and where it turns into a window at the head and the sill. Each one is dimensioned and each one carries leaders. Detail 1 and detail 2 are called out on wall section 3, and the two window details on wall section 4, so you can always walk from the plan to the wall section to the detail without guessing.