Sticky Menu



Skillion Lean-To Roof Framing Calculator - With Running Set-out Points - Metric

? From outside of wall to outside of wall (long side) Wall Length Rafter Thickness ? From outside of wall to outside of wall (short side) Wall Width Rafter Depth Wall Thick Max Rafter Spacing Wall Height Low Side Roof Angle ? Equal Spacing adjusts to nearest UNDER or equal to entered spacing Exact Spacing keeps entered spacing and adjusts 2 end ridge spaces if necessary Rafter Spacing Equal Exact Rafter Overhang Low Side End Rafters Set-in Rafter Overhang High Side Birdsmouth Seat ? ? Check to add high side wall, with NO Lean-To. Un-check to remove high side wall for Lean-To. See diagrams. High Side Wall (NO Lean-To) Battens Batten Spacing First Batten Centre Batten Width Top Batten Set-in Batten Overhang Bottom Batten Set-in Batten Spacing Equal Exact

? Creates a link to save or share current calculation Share this Calculation Scale Possible Alternate Equal Rafter Centres

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.

→

Running Rafters:
Mark-out
Birds-Mouth

Skillion roof rafter detail diagram with all dimensions and birds mouths

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

Angle Wall Height Scale
Skillion Lean-to roof profile diagram

---

Calculator Review: See more ... I just wanted to send a thank you text. I was adjusting plans for a lean to and had to make some pitch changes and plan out the rafters. Your calculator was a huge win for me in making sure I got it right!

---