Walther Strong Deck Tape - Joist Protection Tape

Walther Strong Deck Tape is a self-adhesive joist protection tape applied directly to decking subframes and joists to create a watertight barrier against moisture, rot and weathering. Rated for a service life of up to 50 years, it is available in 50mm and 100mm widths to suit different subframe layouts.

Specifications

Brand	Walther Strong
Material	Recycled and sustainable materials, non-butyl
UV Stability	Fully UV stable
Width Options	50mm, 100mm
Roll Length	20 metres
Application Surface	Timber joists and decking substructure
Use Class	External, above-ground decking subframe

What it is used for

• Protecting timber joists and bearers on outdoor decking subframes from water ingress and moisture rot
• Creating a watertight seal under composite decking boards where the fixing screws pass directly through the tape
• Sealing the top face of treated timber deck substructures to extend service life in exposed UK climates
• Providing a low-friction surface that allows composite or timber boards to slide easily into position during installation

Fitting and handling

Deck tape can be applied to damp timber and in sub-zero temperatures, making it practical on British building sites year-round. Simply peel and press the tape along the full length of each joist before laying boards - the tape self-seals around screw fixings as you drive them through, so no additional sealing is required at fixing points. Rolls can be overlapped without adding significant height to the subframe, and the tape is repositionable before final pressing so you can correct alignment without waste.

FAQ

Does deck tape work on treated timber joists?

Yes. Walther Strong Deck Tape adheres to treated and untreated timber, including damp timber, so it is compatible with pressure-treated C16 and C24 joists commonly used in UK decking subframes.

Which width should I choose - 50mm or 100mm?

The 50mm roll suits standard 47mm joists where you want edge-to-edge coverage with minimal overhang. The 100mm roll is better suited to wider bearers, doubled-up joists or situations where you want the tape to wrap slightly down the joist sides for added protection.

How long does deck tape last once applied?

Walther Strong Deck Tape is rated for up to 50 years of service life. It is fully UV stable, so exposure through gaps in the decking boards will not degrade the adhesive bond over time.

Nottage Timber Merchants stocks Walther Strong Deck Tape alongside a full range of decking boards and decking accessories, available for collection from our Bridgend yard or delivery across South Wales. Contact us to confirm next-day availability for your project.