Roof Ridge Calculator
Calculate tiles, mortar, or dry-fix kits for a professional UK finish.
Material Summary
Ridge Roofing: Systems, Safety & Standards
Storm Proofing Your Roof
The ridge is the most exposed part of any roof. In the UK, high winds can create a 'suction' effect that lifts ridge tiles off. This is why the industry has shifted away from simple mortar bedding towards mechanical fixing.
Whether you are using a traditional **wet-bedded ridge** or a modern **dry-fix system**, our calculator helps you estimate the exact number of tiles needed based on the standard 450mm length.
Standard Ridge Specs
Dry Ridge vs Wet Bedding
Modern **Dry Ridge Kits** use a ventilated roll that sits under the tiles, allowing the roof to breathe while keeping out the rain. The tiles are then screwed into the ridge batten using stainless steel screws and plates.
**Wet Bedding** involves sitting the tiles on a bed of mortar. While aesthetically preferred for heritage and period properties, it is prone to cracking and requires maintenance every 10–15 years.
Mortar Ratios
For a ridge that lasts, use a 3:1 mix of sharp sand and Portland cement. Avoid using building sand alone, as it is too soft and will crumble under frost.
Cutting Ridge Tiles
At the ends of the ridge (the gables), you may need to cut a ridge tile to fit. Always use a diamond-blade disc cutter and wear appropriate PPE. Ensure the cut tile is at least half the length of a full tile for stability.
Pro Tip: Block Ends
At the gable ends, always use a 'Block End' ridge tile. This has a closed face that prevents birds and driving rain from entering the end of the ridge line.
Roof Ridge FAQ
Compliance Disclaimer
Working at height is dangerous. Ensure all roofing work is carried out using appropriate scaffolding and safety equipment. All installations must comply with local building control and BS 5534 standards.