Is a vapour control layer (VCL) required with Proctor Airu00ae?

Typically no internal VCL is required where Proctor Airu00ae is used correctly, but designers should confirm for the occupancy type and insulation strategy.

Is Proctor Airu00ae compliant with BS5534?

Yes. Proctor Airu00ae is specified for use as a BS5534 roofing underlay. Refer to the product data sheet for wind uplift performance and fixing guidance.

New

proctor air roof felt the reclaimed company

SKU: Roofing Breather Membrane |Proctor Air Categories: Membranes, MEMBRANES Tags: breather felt, new in stock, new proctor air, Proctor Air, Proctor roofing felt, Proctor Roofshield, roof felt, roofing breather felt., roofing membrane, slate membrane, slaters felt

Proctor Air ® Roof felt

Q: Do I still need roof ventilation with Proctor Airu00ae?

In many pitched applications, secondary ventilation is not required because the membrane is both air- and vapour-permeable. Always verify your specific build-up and exposure conditions.

£120.00 + Vat

144 in stock (can be backordered)

Usually bought together, these items will compliment the installation of Proctor Air ® Roofing Felt

Treated Timber Battens 25mm X 50mm per m

John Brash Battens...

JB Red quality roofing battens, 25mm x 50mm treated softwood battens. Such battens are suitable for all roofing applications.

Also known as Lath

For fixing roof tiles, slates, sheets, shingles, cladding and other roofing and facade applications.

Price depicted is per linear metre.

Add for £0.80 + Vat

Galvanised Clout nails | Felt Nails (5Kg)

5kg Tub.
25mm galvanised clout nails.
Ideal for securing roofing felt such as breathable membranes.

Add for £19.50 + Vat

OFVS Eaves Tray 1m long (price per meter!!)

OFVS Eaves tray or Eaves Comb
Combined felt carrier and eaves ventilation.
Combs prevent bird access.
Used with pantiles or profiled interlocking tiles.
Collection available
Nationwide delivery service

Add for £4.15 + Vat

Eaves Tray

1500mm long
makes your roof water tight
Collection available
Nationwide delivery service

Add for £1.40 + Vat

Galvanised Lath Nails 65 mm x 3.35mm | 5Kg

Glavanised roundwire nails, 65 mm x 3.35 mm
Sold in 5 KG quantity (plastic tub)
Used for fixings battens to rafters.
Comply with BS5534:2014+A2:2018

Add for £17.73 + Vat

Pack Offers

Buy 24 for £2,790.00

National Pallet Delivery
In store click & collect
Quality reclaimed products

Product Info

Proctor Air® Roof Felt – Vapour-Permeable Roofing Underlay

Proctor Air® roof felt is an air- and vapour-permeable, highly water-resistant roofing underlay for pitched roofs. Its permeability allows complex roof geometries to breathe without secondary ventilation or air gaps, supporting both warm and cold roof build-ups when installed to the manufacturer’s guidance.

Vapour permeable – reduces interstitial condensation risk
Fully air permeable – promotes uniform airflow across the roofscape
Highly water resistant – sheds wind-driven rain under the primary covering
More uniform airflow than discrete vents
Wind uplift resistance suitable for UK exposures (see data sheet)
BS5534:2014+A2:2018 underlay compliance (learn more)
No internal VCL typically required in many pitched applications*
15-year warranty

*Always confirm build-up, climate zone and occupancy. Follow the latest A. Proctor guidance and your designer’s specification.

Product Data | Proctor Air® Roofing Felt

Download technical literature for performance, installation and wind zone fixing:

Key Specifications

Membrane type	Air- and vapour-permeable pitched roof underlay
Primary use	Warm & cold pitched roofs under slate, tile and hard metals
Standards	BS5534:2014+A2:2018 (underlays); consult data sheet for wind uplift
Ventilation	No secondary vents typically required (check project specifics)
Warranty	15 years (manufacturer terms apply)

Applications & Compatibility

Use Proctor Air® under traditional and contemporary coverings. Typical pairings:

Spanish slates & reclaimed Welsh slates
Reclaimed plain tiles & concrete tiles
Westmorland slates
Zinc and hard-metal roof coverings (follow metal roof manufacturer detailing)

Recommended With

BS5534 graded roofing battens
BS5534 compliant nails & fixings
Eaves trays & ventilation accessories for robust eaves detailing
Roof area & slate calculators to plan quantities

Trade & Bulk Pricing

Pallet rates: 24 rolls for £2,790 + VAT or 72 Rolls for £7,450.00+VAT Add quantity to cart to receive discount, shipping rates apply.

We carry stocks of reclaimed and new roofing materials to complement Proctor Air® underlay. Explore our wider roofing materials range.

Why choose Proctor Air® roof felt?

Supports breathable roof build-ups — fewer penetrations vs. vented solutions
Helps manage moisture vapour movement from the roof space
Backed by a 15-year warranty and proven UK site performance

Need specification help? Speak to us for wind zone fixing patterns, eaves details and interface guidance with slates, tiles and hard metals.

Proctor Air® – Frequently Asked Questions

Do I still need roof ventilation with Proctor Air®?

In many pitched applications, secondary ventilation is not required because the membrane is both air- and vapour-permeable. Always verify your specific build-up and exposure conditions.

Is a vapour control layer (VCL) required?

Typically no internal VCL is required where Proctor Air® is used correctly, but designers should confirm for the occupancy type and insulation strategy.

Is it compliant with BS5534?

Yes — Proctor Air® is specified for use as a BS5534 roofing underlay. Refer to the data sheet for wind uplift and fixing guidance.

Weight	5 kg

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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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Proctor Air ® Roof felt