Installing a slate roof requires careful planning, skill and precision to ensure a long-lasting, watertight finish. While we recommend hiring experienced professionals like ourselves for this intricate work, here is an overview of the general process:
- Inspect the roof structure – ensure the roof is structurally sound and capable of supporting the weight of the slates. Assess condition of roof timbers and prepare for any carpentry work that may be required.
- Insulation – check and install as necessary to comply with Building regulations.
- Vents – install any eaves vents that are required.
- Install roof felt and battens – lay a breathable underlay or roofing felt across the roof laid in accordance with BS5534. Fix timber battens over the underlay at appropriate spacings, depending on the size of the slates.
- Choose and prepare the slates – sort slate tiles by size and thickness. Pre-drill holes in the slates if they are not already perforated, taking care to align them for consistent nailing.
- Perp joints – mark the roof with chalk lines to ensure the perp joints are not lost.
- Lay the first course – start at the eaves, ensuring proper overhang for water drainage. Use copper or stainless-steel nails to secure the slates, leaving enough space for expansion and contraction.
- Continue laying slates – work upwards in a staggered pattern, overlapping each row according to the roof pitch and slate size. Check alignment frequently to maintain straight courses.
- Install ridges and flashings – fit ridge tiles along the roof’s apex, securing them with mortar or a dry ridge system. Add lead flashings around chimneys, valleys and roof edges for additional waterproofing.
- Final inspection – check the roof for any gaps, misaligned slates, or improperly secured tiles. Address any issues to ensure a durable, weather-resistant finish.
While these steps provide a basic outline, slate roofing requires specialised tools and knowledge. For a professional installation or advice, contact our team. With over 35 years of experience, we ensure expert craftsmanship for traditional and heritage roofs.