NEAL ROOFING | MATERIALS | NATURAL SLATE
Lousaval LV11 Spanish Roof Slate
A dark, fine-grained natural Spanish roofing slate selected for projects requiring a consistent appearance, reliable natural-slate performance and an alternative to new or reclaimed Welsh slate.
PRODUCT OVERVIEW
What Is Lousaval LV11?
Lousaval LV11 is a natural roofing slate quarried in Galicia, north-west Spain.
It is characterised by a dark grey appearance and relatively consistent texture, making it suitable for projects where a uniform natural-slate finish is required.
For many projects it can provide a practical alternative to premium new Welsh slate or carefully matched reclaimed material, subject to the appearance, planning requirements and specification of the individual building.
As with any natural roofing slate, selection should not be based on colour alone. Product classification, size, thickness, roof pitch, fixing specification, exposure and the wider roof design all need to be considered.
Explore Natural Slate Roofing
NATURAL SLATE CHARACTERISTICS
Why Specify Lousaval LV11?
The attraction of LV11 is not that it imitates Welsh slate exactly, but that it offers a distinctive natural-slate option at a different price and specification point.
Dark Appearance
A generally dark grey to blue-grey appearance suited to roofs where a relatively consistent natural-slate finish is desired.
Natural Stone
Each slate retains the variation and texture associated with a quarried natural roofing product rather than a manufactured imitation.
Broad Application
Suitable for a range of pitched-roofing applications where the slate size, fixing method and exposure conditions are appropriate.
Value Position
Can offer a more accessible route into natural slate than some premium UK-quarried alternatives.
TECHNICAL PERFORMANCE
Natural Slate Should Be Specified by Performance — Not Appearance Alone
Natural slate used for discontinuous roofing and external cladding is covered by BS EN 12326-1, which sets requirements for slate and carbonate slate used in roofing and cladding.
The standard considers characteristics including origin, dimensions, thickness, strength, water absorption and durability-related testing.
The completed roof must then be designed and installed as a system. Roof pitch, slate size, headlap, fixing, battens, underlay and resistance to wind uplift should be considered in conjunction with the relevant roof design and workmanship requirements.
BS 5534 remains the principal UK standard relevant to the design, performance and fixing of slates and tiles on pitched roofs.
BS 5534 Roofing GuidanceSpecification Should Consider
- Slate source and classification.
- Declared product performance.
- Slate dimensions and thickness.
- Roof pitch.
- Exposure and wind loading.
- Headlap.
- Fixing method.
- Batten and underlay specification.
- Appearance and colour variation.
- Planning or heritage requirements.
APPEARANCE & SELECTION
What Does LV11 Look Like on a Roof?
LV11 is generally selected where a dark, relatively consistent natural-slate appearance is required.
Because slate is a natural geological product, some tonal and textural variation should still be expected. Sorting and grading before installation can help create a balanced roof appearance.
The final visual result is also influenced by slate size, bond, headlap, eaves detailing, ridge treatment, valleys, abutments and surrounding materials.
Suitable Projects May Include
- Residential re-roofing.
- New-build pitched roofs.
- Extensions and refurbishment projects.
- Commercial and institutional buildings.
- Architect-designed projects.
- Properties where natural slate is preferred to manufactured alternatives.
On listed buildings or sensitive conservation projects, the existing roof and consent requirements should take precedence over product preference.
COMPARISON & ALTERNATIVES
Spanish Slate, Welsh Slate or Reclaimed Slate?
There is no universally correct natural slate. The appropriate material depends upon the building, required appearance, budget, availability and any planning or conservation requirements.
Lousaval LV11
A dark Spanish natural slate that can provide a consistent appearance and attractive price point for a wide range of pitched roofs.
New Welsh Slate
Premium UK-quarried natural slate with strong architectural and heritage associations. Depending upon the project, options can include Penrhyn, Cwt-y-Bugail and Ffestiniog.
Reclaimed Slate
Can be particularly valuable where matching an existing historic roof is important, although availability, grading and remaining serviceability need careful assessment.
HERITAGE & CONSERVATION
Is Spanish Slate Appropriate for a Listed Building?
Potentially — but not automatically.
On listed buildings and conservation-sensitive roofs, the significance of the existing material should be established before a replacement slate is selected.
Where historic Welsh, Westmorland, Burlington or another distinctive slate survives, retention, reuse or compatible matching may be more appropriate than introducing a visually different material simply because it is less expensive.
Material changes may also require agreement through the relevant planning or listed-building process.
Our heritage approach is therefore building-led rather than product-led.
Heritage Roofing Building ConservationFor Historic Roofs, Consider
- Existing slate origin.
- Historic significance.
- Colour and texture.
- Slate size and course pattern.
- Salvage potential.
- Availability of suitable matching slate.
- Planning and consent requirements.
INSTALLATION
The Slate Is Only One Part of the Roof
A high-quality natural slate can still perform poorly if the roof beneath it or the fixing specification is wrong.
Neal Roofing considers the complete pitched-roof build-up, including:
- Existing or replacement roof structure.
- Roof pitch and exposure.
- Underlay specification.
- Counter battens where required.
- Roofing battens.
- Slate size and headlap.
- Fixing method.
- Eaves and verge detailing.
- Ridges and hips.
- Valleys and abutments.
- Leadwork and penetrations.
- Ventilation and moisture management.
Specification First
Before ordering a natural slate we recommend confirming:
1. Product suitability
Is the slate appropriate to the building?
2. Roof geometry
What size, lap and fixing arrangement are required?
3. Appearance
Is a sample or trial panel required?
4. Quantity
Allow for cutting, selection and reasonable wastage.
EXPLORE NATURAL ROOFING SLATE
Part of the Neal Roofing Materials Library
LV11 should sit within a wider materials cluster comparing natural slate by source, appearance, historic context and appropriate application.
Welsh Slate
Traditional premium natural roofing slate including Penrhyn, Cwt-y-Bugail and Ffestiniog.
Natural SlatingWestmorland Slate
Distinctive green Cumbrian slate traditionally laid in random widths and diminishing courses on significant historic roofs.
Heritage RoofingReclaimed Slate
Historic material suitable for repair, matching and conservation work where condition and provenance are appropriate.
Our Materials
NEAL ROOFING | NATURAL SLATE
Considering Lousaval LV11 for Your Roof?
Send us photographs, drawings, roof dimensions or an existing specification. We can review the proposed roof and advise on slate selection, detailing, installation and suitable alternatives where appropriate.
The correct slate should be selected as part of the roof specification — not in isolation from it.
