ToolHuts

Praktische Tools für exaktes Arbeiten

Rechner für Polygon-Pavillondach & Sparren

Berechnen Sie Haupt- und Gratsparren-Mittellinien, Steigung, Grundrisswinkel und Dachflächen für regelmäßige Dächer mit 3 bis 16 Seiten.

Layout berechnen, Diagramm prüfen, dann das Ergebnis für Werkstatt oder Baustelle ausdrucken.

mm

Measure one outside wall face of a regular polygon.

mm
Hip rafter centerline2878.5mm
Common rafter centerline2699.2mm
Roof rise1207.1mm
Building apothem2414.2mm
Plan half-angle22.50deg
Roof face area21.59

Centerline lengths run from the wall or fascia polygon to the central apex. Apply the ridge block, seat and tail details from the framing plan before cutting.

Funktionsweise

Enter the number of equal wall sides and the length of one side. The apothem is the horizontal common-rafter run; the center-to-corner radius is the hip plan run. Roof pitch converts those plan runs into true centerline lengths.

Worked example: an eight-sided gazebo with 2000 mm wall sides and a 6-in-12 pitch has a 2414.2 mm wall apothem and about 1207.1 mm of rise before the overhang is applied.

Beispiel mit aktuellen Eingaben

Das Ergebnis oben verwendet genau diese Werte. Dieser Datensatz wird beim Drucken einbezogen, damit die Ausgabe mit den ursprünglichen Messungen geprüft werden kann.

Number of sides
8
Wall side length
2000 mm
Pitch rise
6
Pitch run
12
Horizontal overhang
300 mm

Hauptergebnis: Hip rafter centerline: 2878.5 mm.

Vor Verwendung des Ergebnisses

  • Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
  • Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
  • When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.

Einschränkungen

This assumes a regular polygon with a central apex and one common pitch. It does not size structural members or deduct ridge blocks, seats, tails, fascia, birdsmouths or member thickness. Check the actual wall polygon corner-to-corner before cutting rafters.

Häufig gestellte Fragen

Does side length include the overhang?

No. Enter the wall side length and the horizontal overhang separately. The tool projects the roof perimeter outward from the wall polygon.