AEC definitions
A detail drawing is an enlarged drawing of one condition: a jamb, a flashing, a footing, a connection. It is drawn at a scale large enough to dimension the pieces. Plans and sections point to it with a callout.
Definition
Details are where assemblies become buildable. A wall section can show that a window sits in a wall. The detail shows the sill, the flashing, the sealant joint, and the fastener pattern the spec does not want left to chance. A typical detail applies wherever that condition occurs, unless a sheet says otherwise. A specific detail applies to the mark that calls it. Mixing those two up is how a roof edge gets built like a window sill.
In depth
A detail bubble names the detail number and the sheet. If two conditions call the same bubble, they are claiming to be the same detail. When they are not the same, they need two details or a note that says what varies.
Broken callouts, where the bubble points at a sheet that does not contain the detail, are a drawing-review item. The field cannot invent the missing sheet on the day the flashing arrives.
A sheet of typical details is efficient and dangerous. It applies to every similar condition, including the one nobody checked. If a condition is almost typical, draw the exception. 'Similar' is not a dimension.
Reviewers should list where a typical detail is called and where a similar condition is not called. The uncalled one is where the wrong assembly gets built.
The detail shows profile, lap, and sequence of layers. The specification states the product, the standard, and the installer qualifications. A detail that names a manufacturer the spec does not allow is a conflict, even if the geometry is right.
Do not add products in the detail that Division 01 says belong only in the spec. Many offices keep product names out of details for that reason, and use keynotes that point at spec sections.
Details are still not an invitation to scale unless the sheet says so. They exist so the needed dimensions can be written. If a lap or a gap is undimensioned, ask. Scaling a PDF at a copied scale is a good way to be wrong by a factor of two.
Graphic patterns for insulation, concrete, and plywood are conventions. The note and the spec identify the material. The hatch alone does not.
The architect's detail states the result. The shop drawing shows the fabricator's pieces, gauges, and joins. The reviewer checks the shop against the detail. A shop that 'improves' a flashing profile still has to meet the detail's laps and the spec's products.
Delegated-design items, such as cold-formed framing or stairs on some jobs, put engineering in the shop drawing. The architectural detail still states the visible condition and the attachments the architect owns.
Examples
Detail 4/A-501 shows a window sill with a 4 inch flashing lap. The spec section 07 62 00 states the metal. The shop drawing is checked against both.
A typical parapet detail is called at three roofs. The fourth roof has a taller parapet and no callout. The missing callout becomes an RFI before coping is fabricated.
A footing detail on S-401 dimensions the rebar cover. The architectural detail does not restated it. The structural detail governs the reinforcement.
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