DEKS Roof Flashing Seldek Flashing System No.3 Roof Flashing, Flue & Chimney Roof Penetration Seal, Weatherproof Lead Alternative Flashing Part Number: SDA103B

DEKS Roof Flashing Seldek Flashing System No.3 Roof Flashing, Flue & Chimney Roof Penetration Seal, Weatherproof Lead Alternative Flashing

In stock
£108.43
Skip to product information
DEKS Roof Flashing Seldek Flashing System No.3 Roof Flashing, Flue & Chimney Roof Penetration Seal, Weatherproof Lead Alternative Flashing Part Number: SDA103B
About product images

Product images

Some images represent a product range or show a complete installation for context. The size, finish and items included may vary depending on the option selected. Please check the product description and specifications to confirm what’s supplied, as other components or accessories pictured may be sold separately.

If you’re unsure, our team will be happy to help before you order.

DEKS Roof Flashing Seldek Flashing System No.3 Roof Flashing, Flue & Chimney Roof Penetration Seal, Weatherproof Lead Alternative Flashing

SKU W-182292
Manufacturer part number
SDA103B
EAN
9316867006071
£108.43
inc VAT£90.36 ex VAT
Lead time: 1-5 working days

Price Beater

Found this item cheaper elsewhere? Tell us where and our team will see if we can beat the price you've seen.

Product: DEKS Roof Flashing Seldek Flashing System No.3 Roof Flashing, Flue & Chimney Roof Penetration Seal, Weatherproof Lead Alternative Flashing (Part no. W-182292)

UK or international, for example 01234 567890 or +44 1234 567890

If you leave out https:// we add it for you.

Questions about this part? Talk to our team

Phone: 01226 369637

Opening times

Monday to Friday 08:00 to 17:00
Saturday and Sunday: closed

Delivery

Free standard delivery on orders over £100 ex VAT. Orders below this carry a £7.95 inc VAT delivery charge. Express delivery items £19.95 inc VAT, allow 1 to 2 working days. Delivery details and surcharges

Need delivery on or before a specific day? Ask our team.

Description

Product Overview

The DEKS Roof Flashing Seldek Flashing System No.3 is a purpose-made roof flashing designed to create a watertight seal where a flue or chimney pipe passes through the roof. Suitable for repair or new installation work, it helps prevent leaks, draughts and water ingress around roof penetrations. A reliable choice for maintaining a clean, weatherproof finish on domestic and light commercial roofing.

Key Features

  • Weatherproof roof penetration seal – helps stop rainwater tracking into the roof space for long-lasting protection.
  • Designed for flue and chimney applications – supports safer, neater installations around roof pipe exits.
  • Ideal replacement part – a straightforward way to restore performance when an old or damaged flashing starts leaking.
  • Compatible Seldek system component – made to integrate with the Seldek Flashing System for consistent fitting and finish.

Use Case / Application

Commonly used on pitched roofs where a flue pipe, chimney pipe or similar roof penetration needs sealing. Suitable for tasks such as replacing a worn flashing during roof maintenance, fitting a flashing during a boiler flue installation, or sealing roof penetrations on garages, extensions, utility rooms and plant areas. Ideal for installers and homeowners looking for a practical, tidy weather seal around roof exits.

Problem → Solution

Ideal for stopping leaks and damp around flue and chimney roof penetrations by forming a secure, weatherproof flashing seal.

Product Specifications

Manufacturer – DEKS Roof Flashing

Manufacturer Part Number (MPN) – SDA103B

Manufacturer Range / Series – Seldek Flashing System

EAN / Barcode – 9316867006071

Product Type – Roof Flashing (Flue and Chimney Roof Penetration Flashing)

Typical Applications / Use Cases – Sealing around roof penetrations for flue pipes and chimney systems; replacement flashing for leaking or degraded roof seals

Why Buy from BHL

DEKS Roof Flashing is trusted for dependable roof penetration sealing, and the Seldek Flashing System No.3 is built to help deliver a clean, weatherproof result on flue and chimney installations. Buy online today from BHL for competitive pricing and free* and fast UK delivery. BHL is a specialist online merchant, trusted by thousands of satisfied customers online since 1998 with thousands of 5 star reviews. Your order is delivered with care from UK warehouses so you can fit with confidence.

*see our terms

Reviews

Buying guide: Flue & Chimney Systems

Flue and chimney products carry smoke and combustion gases from stoves, fires and boilers safely out of the building. This category covers flexible flue liners and kits, stove adaptors, rigid flue lengths and locking bands, gas flue terminals, and chimney cowls, rain caps and bird guards.

Flexible liners

A flexible metal liner relines an existing chimney; it should not be the main liner of a new one. Liners are usually twin skin stainless steel in 316 or 904 grade, sized by diameter, commonly 125mm or 150mm, and should carry a BS EN 1856-2 designation that suits the appliance, fuel and flue gas temperature. Sweep the chimney before relining. When an appliance is replaced, an old metal liner should normally be replaced too, unless it is recent and in good condition.

Rigid systems, cowls and guards

  • Factory-made metal chimneys: built from lengths, bends and bands, designated under BS EN 1856-1, and kept the stated distance from combustible materials.
  • Cowls and rain caps: anti-downdraught cowls stop wind pushing smoke back down, and rain caps keep water out. Sizes refer to the inside diameter of the pot or flue.
  • Bird guards: stop nesting birds blocking the flue. Gas and solid fuel guards use different mesh sizes, as fine gas mesh can clog with soot, so choose one made for your fuel.

Installation and safety

In England, flue work falls under Building Regulations Part J. Solid fuel installations must be notified to building control, which a HETAS registered installer can do for you, and need a carbon monoxide alarm. Gas flues and appliances must only be worked on by a Gas Safe registered engineer, and oil installations by an OFTEC registered technician.

For stoves and fireside items, see fires, stoves and accessories.

Shop all Flue & Chimney Systems

Related products

Customers also bought