Trex Protect Metric Joist Cap Tape 40mm x 15m is a high-performance self-adhesive flashing tape designed to protect timber joists and decking substructures from moisture penetration and long-term water damage. Engineered for use with timber decking frameworks, this durable waterproof tape creates a protective barrier over joists and timber supports, helping to reduce the risk of rot, decay and structural deterioration caused by trapped moisture and screw penetrations. Ideal for residential and commercial decking projects, Trex Protect Joist Cap Tape is easy to apply and helps extend the lifespan of timber deck framing systems exposed to outdoor conditions. The strong adhesive backing ensures reliable installation while supporting long-term deck durability and performance.
Key Features:
Self-adhesive protective joist cap tape
Helps protect timber decking joists from moisture
Reduces risk of timber rot and decay
Suitable for decking joists and timber framing systems
Waterproof barrier for exposed timber surfaces
Helps seal around screw penetrations
Durable weather-resistant construction
Easy peel-and-stick installation
Suitable for residential and commercial decking projects
Supports long-term deck structure durability
Technical Specifications:
Product type: Joist cap protection tape
Width: 40mm x Length: 15m
Application: Deck joist and timber substructure protection
Suitable for: Timber decking frameworks and joists
Use: Residential and commercial outdoor decking applications
Compatibility: Timber decking and deck framing systems
TJ’s Tip:
Applying joist protection tape before installing deck boards can significantly improve the lifespan of the timber substructure by helping prevent water penetration around screw fixings.
We offer reliable delivery services throughout the Republic of Ireland, with straightforward delivery charges for both trade and DIY customers. Delivery options are confirmed at checkout based on your order and delivery Eircode.
Delivery Charges & Delivery Times
Delivery Type
Delivery Area
Delivery Charge
Delivery Time
Small Items
Republic of Ireland
€9.99
3–4 working days
Large & Heavy*
Standard delivery area
€29.99
5–7 working days
Extra Large*
Standard delivery area
€50.00
5–7 working days
Paint 5L or less**
Standard delivery area
€19.99
5–7 working days
Swipe sideways to compare delivery options.
Small Items
Delivery area
Republic of Ireland
Charge
€9.99
Delivery time
3–4 working days
Large & Heavy*
Delivery area
Standard delivery area
Charge
€29.99
Delivery time
5–7 working days
Extra Large*
Delivery area
Standard delivery area
Charge
€50.00
Delivery time
5–7 working days
Paint 5L or less**
Delivery area
Standard delivery area
Charge
€19.99
Delivery time
5–7 working days
*Standard delivery policy. Promotional delivery rates may apply during campaigns.
Additional Information
FREE delivery on eligible Small Items and Large & Heavy orders over €1,499, within the standard delivery area only.
Special Order and Catalogue Products require an additional 5 working days.
FREE collection of old appliances is available through WEEE Ireland when purchasing qualifying large appliances.
FREE Click & Collect is available for items in stock at your selected branch.
Large & Heavy and Extra Large items are available within our standard delivery area only.
Paint delivery Paint in tin cans 5L or less is available for delivery. Larger sizes and paint supplied in plastic buckets are available for Click & Collect only.
TJ O'Mahony offers a 30-day returns policy on eligible unused products, giving you additional time beyond the statutory 14-day cooling-off period applicable to most online consumer purchases.
Eligible products can be returned for a refund or exchange within 30 days of delivery or collection, provided they are unused, in their original and re-saleable condition, complete with all supplied parts and accessories, and accompanied by proof of purchase.
Please note: Return restrictions apply to certain products, including Mixed Paint, certain Bagged Building Products, Solid Fuel, Special Order, Non-Stock and Catalogued Products.
Your statutory rights in relation to faulty, damaged, incorrectly supplied or non-conforming goods are not affected.
