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Structural, scale 1/8" = 1'-0"

S-201, Level 2 Framing Plan

Beam and joist callouts, spans, bearing direction, structural notes.

The drawing

S-201 Level 2 Framing Plan, Millbrook Branch LibraryARCH D sheet, 36 by 24 inches. Drawn at 1/8" = 1'-0". Use the layer tray and the measure tool below the drawing.FLOOR OPENINGStair 1 and elevatorABCDE12318K5 AT 4'-0" O.C.18K5 AT 4'-0" O.C.18K5 AT 4'-0" O.C.18K5 AT 4'-0" O.C.18K5 AT 4'-0" O.C.18K5 AT 4'-0" O.C.18K5 AT 4'-0" O.C.W14x22W14x22W14x22W14x22W16x26W16x26 MCW16x26 MCW16x26W14x22W14x22W14x22W14x22W12x19W12x19W12x19W12x19W12x19W12x19W12x19W12x19W12x19W16x26W12x1980'-0"40'-0"20'-0"20'-0"20'-0"20'-0"20'-0"20'-0"21'-6"17'-0"Composite deck, see general note 2Moment connection, Grid 2 between B and DJoists bear on the top flange of the beamN08'-0"16'-0"24'-0"32'-0"1/8" = 1'-0"1 LEVEL 2 FRAMING PLANGENERAL FRAMING NOTES1. The screened plan is the architect's Level 2 plan, drawn for reference. Nothing on it is dimensioned here.2. Floor construction: 1 1/2 in composite steel floor deck with 3 1/4 in normal weight concrete topping, 4 3/4 in total.3. Open web steel joists are 18K5 at 4'-0" on centre unless noted, spanning 20'-0" between beams, bearing 4 in minimum on steel.4. The double headed arrow in each bay is the span direction of the joists in that bay. It is not a dimension and it is not a single member.5. Beam to column connections are bolted shear connections unless a moment connection is noted at the frame on grid 2.6. Beam marks give the nominal depth in inches and the weight in pounds per foot, so W16x26 is a sixteen inch beam at twenty six pounds per foot.7. Frame the floor opening at the stair and the elevator with the beam and the header shown. Do not run a joist through the opening.8. Level 2 is 14'-0" above the Level 1 finish floor.FRAMING LEGENDW14x22 Edge beam on grids 1 and 3W16x26 Interior beam on grid 2W12x19 Beam on the letter gridsW12x19 Header at the floor opening18K5 Open web steel joistMC Moment connection at both endsStructural design by Kestrel Engineering.Coordinate every opening with themechanical and plumbing sheets.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"DRAWNKECHECKEDQAREVISIONSNODATEDESCRIPTIONSHEET TITLELevel 2 Framing PlanSHEET NUMBERS-201
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How to read this sheet

A framing plan is a plan of what holds the floor up, drawn as if you were looking down on the steel with the floor deck taken away. The screened lines under it are the architect's Level 2 plan, there so you can tell a beam over a corridor from a beam over a study room. They carry no dimensions on this sheet.

The heavy lines are beams, and each one carries its mark along the line. A mark like W16x26 is a wide flange shape sixteen inches deep weighing twenty six pounds per foot; W12x19 is a shallower, lighter one. Read the plan by grid: the beams on grids 1 and 3 are the edge beams, the beams on grid 2 are the heavier interior beams because they collect load from a bay on each side, and the beams running north to south along the letter grids tie the columns together. Two of the grid 2 beams carry MC after the mark and a filled dot at each end. That is the moment frame, and it is the reason those two connections are welded rather than bolted through a clip.

Between the beams are the joists. They are not drawn one by one on a plan like this; instead each bay carries a double headed arrow that shows which way the joists span, and a note that gives the designation and the spacing, here 18K5 at 4'-0" on centre. The arrow is the single most misread thing on a framing plan. It is not a dimension line and it is not one member: it says every joist in this bay runs this way, from that beam to that beam. Turn the arrow ninety degrees and the whole floor is framed the other way.

The joists span 20'-0" here, which is the bay size the grid gave the building, and they bear on the top flange of the beam, which is what lets the deck run continuously over them. A designation like 18K5 tells you the depth in inches and the load series, so 18K5 is an eighteen inch deep joist. Depth matters to more trades than the steel erector: a duct or a pipe crossing under an eighteen inch joist has that much less room above the ceiling.

At the stair and the elevator there is a hole in the floor, and a hole in a floor has to be framed. Follow the two heavy lines around it: a beam down the east side of the opening from grid 2 to grid 3, and a header across its north side. No joist crosses the opening, and the joists that would have landed there bear on the header instead. Any opening you meet on a framing plan should have that pattern around it, and if it does not, that is a coordination question for the engineer rather than a decision for the field.