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SKU: CWT-Y-500x300 Categories: New Welsh Slate, Roof Slates Tags: Bethesda, New welsh slates, roofing slate, Slates, Spanish Slate, Wales, Welsh heritage, welsh slate

Cwt-y-Bugail Roof Slate

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🏪 Collection

Delivery can be arranged nationwide by pallet/courier or locally by our own fleet

Your nearest store:

York

Sutton Road, Wigginton, YO32 2RB

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Cwt-y-Bugail Roof Slates.
500mm x 300mm 20″ x 12″
Celtic, County and Capital grades. (learn more)
National delivery options.
Contact us for a quotation based upon required quantities.
National delivery options available based upon quantities required.
Add battens, nails, membranes and more.

+Product Info

Description

Cwt-y-Bugail Roof Slate Cost

Product overview

Transform your roofing projects with the exquisite Cwt-y-Bugail slate, renowned for their exceptional quality and timeless elegance. Quarried from the heart of Snowdonia in North Wales, these slates offer a unique blend of traditional craftsmanship and modern performance. Perfect for both historic renovations and contemporary builds, Cwt-y-Bugail slates ensure a durable, stylish, and environmentally friendly roofing solution.

Key Features

Unmatched Quality: Extracted from one of the finest slate quarries in the world, Cwt-y-Bugail slate is known for their superior density and minimal water absorption, ensuring long-lasting durability and resistance to weathering.
Aesthetic Appeal: With their distinctive blue-grey hue and natural texture, these slates provide an elegant and sophisticated finish that enhances the beauty of any architectural style.
Sustainability: Produced with minimal environmental impact, Cwt-y-Bugail slates are a sustainable choice, offering a lifespan of over 100 years and the potential for full recyclability.
Versatility: Available in various sizes and thicknesses, these slates can be customised to suit different design requirements, making them ideal for a wide range of roofing applications.

Environmental

Cwt-y-Bugail roof slate cost, the financial costs may be higher than other imported alternatives, However, the environmental cost is minimised by buying British.

A British slate that has been mined in the UK, and does not need to travel thousands of miles for use. Wales is amongst the finest slate producing nations in the world. Keeping your building materials local, will reduce your carbon footprint over time.

The Ultimate Guide to Cwt-y-Bugail

Not satisfied with the information at product level, why not take a look at a more in depth overview of this fantastic roof slate.

Projects with Cwt-y-Bugail

Want to see how these slates look when installed on a roof, then the following projects may be of interest.

Video

Additional information

Weight	3 kg
Dimensions	500 × 300 × 0.5 cm
Slate Size	500x250mm capital, 500x375mm capital + ½, 500x250mm county, 500x375mm county + ½, 400x250mm capital, 400x375mm capital + ½, 400x250mm county, 400x375mm county +½
Grades	County Grade are circa 7.0mm thick, Capital Grade are circa 5.5mm thick, Celtic Grade are thicker still at circa 9.0mm.
Headlap	Unholed, 100mm Headlap, 75mm Headlap, 50mm Headlap

Project Video

An installaiton using Cwt-y-Bugail roof slates as part of a listed building renovation near York.

Slate Calculator

Slating Headlap

Lap

Expandable Headlap Info

Choosing Headlap

Definition: The vertical overlap between successive rows of tiles to prevent water ingress.

Factors to consider:

Roof pitch: Shallower pitches (< 30°) need 75–100 mm; steeper (> 45°) can use 50 mm.
Climate & exposure: Wind-driven rain or heavy rainfall zones benefit from more headlap.
Tile profile: Deeper tiles may require extra overlap to seal correctly.

Rule of thumb:

Standard (30–45°): 50–75 mm
Low (< 30°): 75–100 mm
High (> 45°): 50 mm

Slate Size / Type

Slate 50mm Lap

Selecting Tile Size

Coverage per tile: Larger tiles cover more area but are heavier, affecting handling and substrate load.

Aesthetic scale: Big tiles suit modern, minimal lines on large roofs; smaller tiles give more texture and a traditional look.

Structural limits: Check rafters and battens can support the chosen tile’s weight and fixing centres.

Installation speed vs. waste: Larger tiles lay faster but may require more cutting at edges, increasing waste. Smaller tiles take longer but can reduce off-cuts.

Compatibility: Ensure the tile size works with your chosen headlap & side-lap for correct coverage per m².

By balancing pitch, weather, substrate capacity and appearance, you’ll pick the optimal tile size for performance and style.

Slate 75mm Lap

Selecting Tile Size

Coverage per tile: Larger tiles cover more area but are heavier, affecting handling and substrate load.

Aesthetic scale: Big tiles suit modern, minimal lines on large roofs; smaller tiles give more texture and a traditional look.

Structural limits: Check rafters and battens can support the chosen tile’s weight and fixing centres.

Installation speed vs. waste: Larger tiles lay faster but may require more cutting at edges, increasing waste. Smaller tiles take longer but can reduce off-cuts.

Compatibility: Ensure the tile size works with your chosen headlap & side-lap for correct coverage per m².

By balancing pitch, weather, substrate capacity and appearance, you’ll pick the optimal tile size for performance and style.

Slate 100mm Lap

Selecting Tile Size

Coverage per tile: Larger tiles cover more area but are heavier, affecting handling and substrate load.

Aesthetic scale: Big tiles suit modern, minimal lines on large roofs; smaller tiles give more texture and a traditional look.

Structural limits: Check rafters and battens can support the chosen tile’s weight and fixing centres.

Installation speed vs. waste: Larger tiles lay faster but may require more cutting at edges, increasing waste. Smaller tiles take longer but can reduce off-cuts.

Compatibility: Ensure the tile size works with your chosen headlap & side-lap for correct coverage per m².

By balancing pitch, weather, substrate capacity and appearance, you’ll pick the optimal tile size for performance and style.

Slates Per m2

Expandable Slates per m² Info

Calculating Slates per m²

Definition: Number of slates needed to cover one square metre.

Formula: 1 000 000 mm² ÷ (effective width × effective height)

Where:

Effective width = tile width – side lap
Effective height = tile height – head lap

Example: 610 mm × 355 mm tile, 20 mm side lap, 75 mm head lap:

Effective width: 610 − 20 = 590 mm
Effective height: 355 − 75 = 280 mm
Area per slate: 590 × 280 = 165 200 mm²
Slates per m²: 1 000 000 ÷ 165 200 ≈ 6.05

Adjust your headlap and sidelap values for precise coverage calculations.

Slate Required(Required)

Measure Your Roof Area

Determining Your Roof’s Area (m²) Accurately measuring your roof is essential to estimate how much slate you’ll need. Follow these steps: Measure the rafter length Runs from the gutter up to the ridge line.

Width (m)

Length (m)

Total Mtr²

Total Slates Required

Copper Nails Total KG

Expandable Copper Nails Info

Copper Nails for Slating: Overview & Specs

Why use copper nails?

Corrosion resistance: Forms a protective patina to prevent rust and staining.
Superior durability: Lasts for decades without needing replacement.
Optimal flexibility: Absorbs roof movement without cracking or shearing.
Aesthetic harmony: Weathers to a warm patina that complements natural slate.
Chemical compatibility: No galvanic reaction with slate or lead flashings.

Packaging & usage:

Approx. 250 copper nails per kg
Minimum 2 nails per slate
Recommended length: 25–30 mm shank, 3.35 mm (4 gauge) head

Expandable Free Quote Info

Get a Free Quote

We’ll find the best price for the slates you need and email you a no-obligation quote.

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