McAlpine 3 in Roof Flashing 18″ × 18″ (MacFlash RS4)
Product Description
The MacFlash Roof Flashing RS4 is a high-quality aluminium flashing designed to create a watertight seal around 3‑inch (110 mm) pipe penetrations through roofs. Measuring 18″ × 18″, it’s suitable for both flat and pitched roofs and serves as an efficient, lead-free alternative for sealing flue pipes, soil stacks, or ventilation outlets.
Key Features
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Size: 18 in × 18 in base for wide-reaching coverage
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Pipe Compatibility: Suitable for 3‑inch (110 mm) pipe diameter
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Material: High-grade aluminium with a synthetic rubber collar for flexibility and waterproofing
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Roof Pitch Compatibility: Works on flat roofs and pitched roofs up to 45°
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Design: Flexible, corrugated base adapts to most roof profiles and eliminates the need for traditional lead slates
Advantages
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Easy Installation: Lightweight material and flexible base simplify fitting compared to lead alternatives
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Durable & Weatherproof: Aluminium resists corrosion, while the rubber collar maintains a long-lasting seal
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Cost-Efficient: Saves on both material and labour costs vs. lead flashing
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Versatile: Flexible design suits a wide range of roof coverings—tiles, slates, and shingles
Recommended Applications
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Residential & Commercial Roofs: Great for boiler flues, soil stack penetrations, and vent pipe terminations
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New Builds & Renovations: Ideal for lead-free projects and structures requiring dependable roof sealing
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Pipe Sizes: Specifically engineered for 3‑inch pipes in domestic and light commercial settings
Summary
The McAlpine MacFlash RS4 Roof Flashing is a modern, user-friendly solution for creating reliable pipe seals through roofing systems. Lightweight yet robust, with a flexible base and high-quality materials, it provides a superior, lead-free option that combines ease of installation with long-term performance.
At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.
🆓 Free Local Delivery (Orders £100 & above)
We offer FREE delivery on orders £100 or more
for selected local areas.
Eligible Postcodes Include:
- RG*
- SL*
- OX10*, OX11*, OX49*
- HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
- WD*, HA*, UB*, TW*, KT*
- W1* – W9*
- NW*, SW*
Delivery Time: 2–4 working days
Shipping Cost: £0.00
📦 Standard Shipping (Weight-Based Rates)
For orders that do not qualify for free delivery, standard
shipping rates apply based on total cart weight.
- For cart weight between 0–2 kg, the shipping cost is £4.50 with a delivery time of 2–4 working days.
- For cart weight between 2–24 kg, the shipping cost is £9.99 with a delivery time of 2–4 working days.
- For cart weight between 24 kg and above, the shipping cost is £60 with a delivery time of 2–4 working days.
🧱 Block Salt (Harvey’s) – Unit-Based Shipping
This rate applies only to Harvey’s block salt products.
- £7.99 is charged for every 3 items.
- The charge increases by £7.99 for each additional set of 3 items.
Examples:
- 1–3 items → £7.99
- 4–6 items → £15.98
- 7–9 items → £23.97
Delivery Time: 2–4 working days
📏 Large / Long Items (Length-Based Shipping)
For oversized items where the product length is 1.5 metres or more:
Conditions:
- Product length ≥ 1.5 m
- Cart weight ≤ 40 kg
Shipping Cost: £18.00 (flat rate)
Delivery Time: 2–4 working days
Collection from Store
Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.
