The free app that finds rafters through the roof
For thin roof coverings like slate, using the sensors in your phone. iPhone and Android. No cost. No subscription. For every roof covering, see Pro & Sled.
Made for installers on real roofs
Readable outside, quick to use, works when the signal is poor.
Find every rafter
Locate rafters through the covering without taking tiles off.
Easy to use
If you can put a phone flat on a tile, you can use Rafter Finder.
Works offline
No internet needed on the roof for scanning.
Readable in sunlight
High-contrast screens for outdoor use.
Workflow
Ready · Scan · Confirmed
The same states you see in the app.
1. Ready to scan
Place flat, away from battens or nails.
2. Calibrating
Hold still while it sets a baseline.
3. Find the high
Slide — the peak marks the rafter nail.
Screen recording — muted, autoplay
What the free app covers
Strong on thin coverings like slate. Pro is for every roof covering.
- Direct scan: natural slate, Cambrian, thin single-lap, many fibre-cement products
- Some thicker roofs: magnets can help as a workaround
- Every roof covering — thick concrete, stone, multi-layer — see Pro & Sled
Get started
Download free today
Get Rafter Finder free for thin coverings like slate, then join the Pro waitlist if you need every roof covering.
Free download