How Rafter Finder works
Find the nails that matter, skip most of the clouts, mark the rafter, then fix. Simple on-roof workflow.
What the free app is sensing
Rafter and batten nails leave a magnetic signature your phone can read through thin coverings like slate. Most tile and slate clouts are filtered out so you’re not chasing every fixing in the covering. Find the local high — that’s the rafter nail — then work along the batten for the rafter line. Pro is for every roof covering.
Free app flow
- 01
Place & calibrate
Phone flat on the tile. Calibration tells the app where your sensor is so it can show the sensor position on screen while you scan.
- 02
Scan
Slide steadily across the surface. Two ways to read the signal:
- Indicator 1: Shows a LIVE figure. Look for the local high. Always scan along the batten (usually about a third of the way up a slate) to find the batten or rafter nail. Two or three local highs in a vertical line — that's the rafter.
- Indicator 2: A confidence indicator. Scan the area first so it records the data, then the bar hits 100% on that area's local high. Best when you already know roughly where the nail is.
Indicator 1 — LIVE
Indicator 2 — 100% peak
Real install video
- 03
Confirm the rafter
Two or three local highs in a vertical line — that's the rafter.
Indicator 2: Peak zone at 100% means you're on the local high. Handy when you already know roughly where the nail is.
- 04
Mark & fix
Mark the nail. Two nails in line — that's the rafter line. Install your mounting of choice.
Magnets on thicker free jobs
The free app is for thin coverings like slate. On some thicker roofs you can place three spaced neodymium magnets along each rafter (don’t stack them) and scan from outside. If you want every covering without that step, Pro & Sled is the tool for it.
Pro flow (preview)
Pro is for every roof covering — sled-guided scan with a dedicated sensor, higher resolution, deeper nail detection, and AR rafter lines on the surface.
Free is strong on thin coverings like slate today. Pro & Sled is for every roof type, with dedicated hardware and AR. Join the waitlist if that's your work.
Pro waitlistNo loft required to locate
On thin coverings like slate, scan from outside with the free app. You only need loft access if you’re placing magnets for a thicker free job. Pro is meant to work from outside on every covering.
Get started
Ready to find every rafter?
Get the free app for thin coverings like slate, or join the Pro waitlist if you need every roof covering.
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