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Saltbox Roof Calculator - Inch

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From outside of wall to outside of wall (long side)
Wall Length
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From outside of wall to outside of wall (short side)
Wall Width
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From outside of front wall to centre of ridge. See diagram below.
Front Span

Front Roof Angle :12
Rear Roof Angle :12

Front Overhang
Rear Overhang
Gable Overhang

End Rafters Set-in
Rear Wall Height
Wall Thickness
Rafter Thickness
Rafter Depth

Ridge Thickness
Ridge Depth

Max Rafter Spacing
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Equal Spacing adjusts to nearest UNDER or equal to entered spacing

Exact Spacing keeps entered spacing and adjusts 2 end ridge spaces if necessary
Spacing Type

? Birdsmouth Seat Cut
Birdsmouth Seat Front
? Birdsmouth Seat Cut
Birdsmouth Seat Rear





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Creates a link to save or Share current calculation
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Scale

Saltbox roof framing calculator plan diagram with full dimensions

Left click, release then drag to measure full scale in diagram below - Enlarge scale for more accurate measurements.

Front Angle Rear Angle Front Span Scale

Saltbox roof profile diagram with all angles, dimensions

Saltbox roof front rafter detail diagram with dimensions and birds mouth


Saltbox roof rear rafter detail diagram with dimensions and birds mouth




Running measurements are - AND ON - from start point to near side of each rafter.
Measuring from start end, make the mark then put an X after the line to show which side the rafter goes.

|x|x|x|x|x


Running Ridge:
Mark out

Running Wall:
Mark out




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If you need to take full scale measurements directly from your monitor, adjust the size of the diagrams on screen to match a ruler. Does not affect printed sizes. Use keyboard Cursor Keys to fine tune as you adjust scale.
Adjust scale of diagrams to measure 100% scale on screen with a ruler.

Tap to Transfer this page to Phone via

All Inch inputs and dimensions are actual physical finished sizes
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Select output Fraction Precision then Re-Calculate to display.
Fraction Precision
Lumber
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Selected value is automatically copied to clipboard. Select then Paste into text box.
Prec…


0


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