Roof Recovering with New Roofing Materials — Which Machine, Which Providers?
- Recommended class
- Tonziegel/Beton/Schiefer
- Typical duration
- 1-2 Wochen
- Cost estimate
- 80-150 €/m²
Overview
Roof recovering involves the complete replacement of existing roofing materials with new clay tiles, concrete tiles, or slate whilst retaining the underlying roof structure and battens where appropriate. This is a common intervention when the original covering has reached the end of its serviceable life—typically after 40-60 years for clay tiles, 30-50 years for concrete tiles, or 80-100+ years for natural slate—but the timber framework remains sound. The process requires careful planning, appropriate access equipment, and skilled labour to ensure weathertightness and compliance with current building regulations.
Equipment requirements vary significantly with roof pitch, height, building access, and project scale. For single-storey domestic extensions or bungalows, a standard scaffold tower or lightweight aluminium tower scaffold (3-6m working height) may suffice, with materials lifted manually or via rope and pulley. Two-storey residential properties typically require full scaffold access with loading bays, whilst larger commercial or multi-storey buildings demand mobile elevating work platforms (MEWPs), telehandlers with forks or lifting jibs (2.5-4 tonne capacity), and potentially a crane for palletised tile delivery directly to roof level. A 6-8 tonne skip or grab lorry handles the removal of old materials. The typical project duration is 1-2 weeks for an average 100-150 m² domestic roof, with costs ranging from £68-127 per m² (€80-150/m²) depending on material choice, access complexity, and regional labour rates.
Step-by-step
1. Site Setup and Protection
Erect scaffolding to all elevations with roof access, ensuring edge protection and loading platforms at eaves level. Install debris netting or chutes to contain falling materials. Protect gutters, downpipes, and adjacent glazing with boarding. Position skip or waste container within reach of roof. Establish exclusion zones to prevent pedestrian access beneath work areas. For occupied buildings, seal loft hatches internally with polythene to minimise dust ingress and brief occupants on noise and restricted access periods.
2. Stripping Existing Covering
Systematically remove existing tiles, slates, and battens from ridge down to eaves, working in manageable sections to maintain some weather protection. Strip only areas that can be recovered within the same working day if weather is uncertain. Check sarking felt or breathable membrane condition—if torn, degraded, or absent, plan for complete replacement. Remove all nails, clips, and damaged timber. Lower stripped materials via chute or controlled hand-balling into skip. Inspect rafters and purlins for rot, beetle infestation, or structural defects requiring repair before proceeding.
3. Membrane and Batten Installation
Install new type 1F breathable roofing membrane or BS 5250-compliant sarking felt, laying horizontally from eaves upward with minimum 150mm side laps and 100mm end laps, ensuring adequate drape between rafters for drainage. Secure with clout nails or battening. Fix pressure-treated softwood battens (typically 38x25mm or 50x25mm) horizontally at gauge appropriate to tile length and pitch, ensuring vertical alignment and securing to rafters with galvanised nails (minimum 65mm). Install counter-battens if specified for enhanced ventilation. Fit eaves closers, tile vents, or ridge ventilation as per Building Regulations Part F ventilation requirements.
4. Tile or Slate Laying
Commence laying from eaves, working left to right and upward, ensuring proper headlap (minimum 75mm for slate, varies for tiles per manufacturer) and side interlock. Nail every tile in high-exposure zones or pitches over 45°; for standard locations, nail alternate courses or per BS 5534 recommendations. Use appropriate stainless steel or copper nails for slate, galvanised or aluminium for concrete/clay tiles. Cut tiles at verges, valleys, and abutments with disc cutter or guillotine. Maintain consistent gauge and alignment; check coursing every 1-1.5m. Install purpose-made valley tiles, lead soakers at abutments, and proprietary dry-fix verge systems where specified.
5. Ridge, Hip, and Verge Detailing
Fit ridge and hip tiles using either traditional mortar bedding (1:3 cement:sand with plasticiser) on ridge board or modern dry-fix mechanical systems with clips, brackets, and foam infill to BS 8612 standard. Dry-fix is now preferred for durability and ventilation provision. Install mortar-free verge systems with cloaked or block-end tiles clipped to verge battens. Ensure continuous ventilation at ridge level where required (typically 5,000mm² per metre run). Point gable ends and bed hip irons or finials securely. Check all details for weather-tightness and mechanical integrity before scaffold striking.
6. Flashing, Inspection, and Completion
Renew or install lead flashings (Code 4 minimum) at chimney stacks, parapet walls, and abutments, with stepped or cover flashings dressed into mortar joints and secured with lead wedges and pointing. Ensure 150mm minimum upstands. Install new flue terminals or cowls if disturbed. Clear all debris from gutters and check outlets. Conduct final inspection for loose or misaligned tiles, incomplete fixings, and ventilation compliance. Remove scaffold, reinstate disturbed areas, and provide client with maintenance guidance and tile supplier warranty documentation. Notify Building Control for final inspection if applicable under Building Regulations.
Cost breakdown
| Scaffolding (full access, 2 weeks) | £1,200-2,200 | Varies with building height, footprint, and access constraints |
|---|---|---|
| Labour (2-3 roofers, 1-2 weeks) | £3,000-6,000 | Based on £200-350 per day per skilled operative |
| Roofing materials (tiles/slates, membrane, battens) | £3,500-8,000 | Clay tiles £40-70/m², concrete £25-40/m², slate £60-120/m² for 100m² roof |
| Skip hire or waste removal (6-8 yd³) | £250-450 | Includes disposal of stripped tiles, battens, and packaging |
| Flashings and ancillaries (lead, fixings, vents) | £400-800 | Code 4 lead, dry-fix systems, ventilation components |
| Access equipment (telehandler or MEWP, if required) | £300-700 | For complex access or heavy material lifting; weekly hire rates |
| Membrane, underlay, and breathable felt | £200-400 | Type 1F breathable membrane at £1.50-3.00/m² plus installation |
Common pitfalls
- Stripping entire roof without checking weather forecast — sudden rain soaks timber structure and internal ceilings, causing £2,000-5,000 damage and mould risk.
- Reusing degraded battens to save cost — inadequate fixing strength leads to tile slippage and subsequent water ingress, requiring re-work costing £3,000-6,000.
- Inadequate headlap or incorrect gauge for roof pitch — fails BS 5534 wind-uplift and watertightness requirements, causing leaks and potential Building Control rejection.
- Omitting ventilation provision at eaves and ridge — condensation accumulates in roof space, leading to timber rot and insulation degradation within 3-5 years.
- Using incompatible fixings (e.g. steel nails with slate) — galvanic corrosion causes premature failure, requiring replacement within 10-15 years instead of 50+.
- Ignoring asbestos risk in pre-2000 properties — disturbing asbestos cement roof components without licensed removal incurs HSE fines up to £20,000 and health risks.
FAQ
- Do I need Building Regulations approval for roof recovering work?
- In England and Wales, complete re-covering exceeding 25% of the roof area or 50% if thermal upgrading triggers Building Regulations compliance (Parts C, F, and L). You must notify Building Control before starting work or use a Competent Person Scheme installer who self-certifies. Scotland requires Building Warrant for most roof work under Building Standards. Northern Ireland follows similar notification rules. Approval covers structural adequacy, fire safety, ventilation (5,000-10,000 mm² ridge ventilation per metre), and thermal performance (U-value ≤0.16 W/m²K for replacement). Failure to notify can lead to enforcement action and difficulties selling the property.
- What is the typical cost difference between clay tiles, concrete tiles, and slate?
- Material costs vary significantly: concrete tiles £25-40/m² (economy option, 30-50 year lifespan), clay tiles £40-70/m² (traditional appearance, 50-60+ years, better frost resistance), and natural slate £60-120/m² (premium, 80-100+ years, lowest maintenance). Installed costs including labour for a 100m² roof: concrete £8,000-10,000, clay £10,000-13,000, slate £13,000-18,000. Reclaimed or architectural slates can exceed £150/m². Factor in lower lifecycle costs for slate due to longevity, and regional aesthetic or planning requirements which may mandate specific materials in conservation areas.
- Can I re-use existing tiles or slates when recovering a roof?
- Clay tiles and natural slate can often be salvaged and re-used if undamaged, reducing material costs by 30-50%. Inspect each piece for cracks, delamination (slate), frost damage, or nail-hole deterioration. Concrete tiles degrade more and are typically not worth salvaging after 40+ years. Factor in additional labour time for careful stripping, sorting, cleaning, and double-handling—this may offset material savings on smaller projects. Re-use is most economical on larger roofs (150m²+) or with high-value materials like Welsh or Westmorland slate. Always purchase 10-15% new stock to replace damaged pieces and provide spares for future repairs.
- Should I hire professionals or attempt DIY roof recovering?
- Roof recovering is high-risk work requiring working-at-height competence, Building Regulations knowledge, and specialist skills. DIY is strongly discouraged unless you are an experienced trades person with appropriate scaffolding, insurance (public liability minimum £5 million), and understanding of BS 5534 standards for wind uplift and weathertightness. Professional roofers carry £10 million+ liability cover, provide guarantees (typically 10-20 years), and ensure compliance. Errors cause expensive water damage (£5,000-15,000 typical claim), safety incidents, and insurance voids. For average homeowners, professional installation is essential; for trade-experienced individuals, consider sub-contracting at least the scaffolding and complex detailing.
- How long does a roof recovering project take and what delays should I expect?
- A typical 100-150m² domestic roof takes 7-12 working days with a two-person crew: 1-2 days stripping, 1 day membrane and battens, 4-6 days tiling, 1-2 days ridge/flashing, plus scaffolding erection/dismantling (1 day each). Factors extending duration include complex roof geometry (valleys, dormers), multiple chimneys, difficult access, structural repairs discovered during stripping, or adverse weather. Allow 2-3 weeks calendar time with weather contingency. Winter projects (November-February) face higher weather delays. Material supply delays (especially for slate or specific clay tiles) can add 2-4 weeks. Never start work without confirmed material delivery dates and weatherproof tarpaulins for overnight or emergency protection.
- What is the best time of year to schedule roof recovering work?
- Late spring through early autumn (April-October in the UK) offers optimal conditions: longer daylight hours, lower rainfall probability, and moderate temperatures for mortar curing (if used). Avoid November-February due to short days, frequent rain, frost risk affecting mortar, and higher scaffold costs due to extended hire during weather delays. Summer (June-August) is peak season—book roofers 8-12 weeks ahead and expect premium rates. Shoulder seasons (April-May, September-October) balance good weather and contractor availability. Always include weather contingency days and ensure temporary weatherproofing (tarpaulins, breathable membrane) is available if work spans multiple days. For commercial projects, coordinate with business operations to minimise disruption.