Lisnastrain Cavity Trays

29/04/2025

All boxed off!!!!

Our cavity tray parcels heading out this morning to Dumfries Scotland, Haverfordwest Wales and Cork Ireland. 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🏴󠁧󠁢󠁷󠁬󠁳󠁿 🇮🇪

29/04/2025

In this hot 🔥 weather ☀️ it is important to adapt how you keep and use lead flashing:

In warm or hot weather, lead flashing will typically expand. This expansion is a natural property of lead, and it can lead to issues if not accounted for during installation. Improperly installed flashing might warp, crack, or even separate from the roof structure if it can't expand freely.

Here's a more detailed breakdown:

😳Thermal Movement:
Lead is a metal, and like other metals, it expands when heated 🥵 and contracts when cooled 🥶 This expansion and contraction are known as thermal movement.

😳Potential Problems:
If flashing is installed too tightly or without proper allowance for expansion, it can buckle, crack, or even lift away from the roof surface when it heats up.

😳Importance of Ventilation:
Proper ventilation under the flashing helps regulate roof temperatures, preventing excessive heat buildup and reducing the potential for expansion-related damage.

😳Proper Installation:
Lead flashing should be installed with sufficient space to allow for expansion and contraction, often using methods like folding or creating small gaps.

😳Corrosion:
While lead is resistant to corrosion in most environments, it can still corrode under certain conditions, especially if it's exposed to acidic rain or pollutants.

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25/04/2025

🌧️ What is a Lisnastrain Cavity Tray, what does it do, how is it used??? ☔️

Here’s the details🤚

🛗 A stepped cavity tray is a crucial feature in building construction, especially in masonry cavity walls, designed to manage and redirect moisture (usually rainwater) that pe*****tes the outer leaf of a wall. Here's a breakdown of how it works:

🗃️ What is a Cavity Tray?
A cavity tray is a damp-proof barrier installed within a cavity wall. Its main job is to collect and redirect any water that seeps through the outer brick or blockwork, preventing it from reaching the inner leaf of the wall where it could cause dampness or structural damage.

🙋 What Makes a Cavity Tray "Stepped"?
A stepped cavity tray is used over stepped features in a wall—most commonly sloping roofs or stepped abutments, like where a roof meets a wall at an angle (e.g., a dormer or lean-to roof). Instead of being one continuous horizontal tray, it consists of several individual sections (or "steps") that follow the downward slope.

📖 How It Works:
Collection of Water: Water that enters the outer leaf runs down the back of the outer masonry until it hits the cavity tray.
Redirection: The tray has a slope (or pitch) that redirects water sideways, following the step formation downward.
Weep Holes: At the base of each step, weep holes are installed in the outer wall to allow the collected water to escape to the outside.
Overlap and Continuity: Each section of the tray overlaps with the next lower one, creating a continuous, waterproof path that channels water out without letting it get into the inner wall.

🌎 Where It's Typically Used:
Above roof abutments
Over lintels
In stepped gable walls
Along chimney stacks
Key Features:
Made of materials like plastic (DPC), lead, or flexible polymer
Needs proper installation with overlaps and weep vents
Part of overall damp-proofing strategy

www.cavitytrays.ie

17/04/2025

Full Load out this morning delivering to Armagh, Newry, Warrenpoint, Dundalk and Kingscourt

17/04/2025

What have these dormer window trays and the premier league trophy have in common?

They are all heading to Liverpool!!!! 😂

Dormer window trays made to order in Code 5 lead. Made to customers specification.

15/04/2025

What is a block cavity tray ?🙋

✅ A cavity tray is a damp-proof course that is used to stop the internal skin of the wall from becoming wet.

🧱 Block cavity trays are specialised components used in cavity walls, particularly where blockwork is involved, to prevent moisture from entering the inner wall from the outer leaf.

🌧️ They act as a barrier and drainage system, channeling any water that pe*****tes the outer wall away from the inner wall, preventing damp issues and potential damage👍

Our block cavity trays come with lead mechanically fitted direct from the factory 🏭

Pictured here is an order of block trays ready for dispatch to a customer in Sligo, Ireland. Order placed yesterday evening, to be delivered today👍

11/04/2025

👏 Ordered, manufactured and dispatched all on the same day 👏

⏰ This is our normal service as we understand that builders are on site in this excellent 👌 spell of warm weather 🌞 needing to crack on and get the job done✅

This includes 5 orders to Scotland 🏴󠁧󠁢󠁳󠁣󠁴󠁿, 8 to England 🏴󠁧󠁢󠁥󠁮󠁧󠁿 2 orders off to Wales 🏴󠁧󠁢󠁷󠁬󠁳󠁿 and 16 across Ireland away this morning.

Busy 🐝 time!!

www.cavitytrays.ie

08/04/2025

As we’re constantly reminded, we live in one of the world’s rainiest countries. It’s not unusual for some parts of the region to experience a month’s worth of rain in a single day and it’s won’t get dryer in the long-term that’s for sure.

Increased rainfall over the past few years has necessitated the installation of a cavity tray retrospectively in many old extensions that previously went without one.

Erring on the side of caution is ultimately your best bet as a cavity tray will future-proof your property against potential damp, so your designer and then builder should include it in your chosen design

Www.cavitytrays.ie

Photo: Clearviewhome.co.uk

07/04/2025

In this warmer weather it is important that your lead flashing had been properly installed 🔨

This will ensure it will do its jobs when it’s wet and not so warm 🌞

In hot weather, lead flashing, like other metals, expands and contracts with temperature changes, which can lead to cracks, splits, and weakened areas if not installed correctly to account for this movement.

Here's a more detailed explanation:

👍Expansion and Contraction:
Lead, like all metals, expands when heated and contracts when cooled.

🙄Potential Damage:
If lead flashing isn't installed with enough flexibility to accommodate these temperature-related movements, it can warp, crack, or become weakened, compromising its ability to provide a watertight seal.

👍Importance of Proper Installation:
Proper installation, including using the correct thickness of lead and allowing for expansion joints, is crucial for ensuring the longevity and effectiveness of lead flashing.

👍Other Factors Affecting Lead Flashing:
Besides heat, other factors like harsh weather conditions, freeze-thaw cycles, and debris can also contribute to the deterioration of lead flashing.

🤬Signs of Damage:
Cracks, splits, or weakened areas in the lead flashing are signs that it may need repair or replacement.

👍Durability:
When installed correctly, lead flashing can be a durable and long-lasting waterproofing solution.
Examples of Lead Flashing

👍Applications:
Lead flashing is commonly used around chimneys, windows, and other roof penetrations to prevent water from entering the building.

Www.cavitytrays.ie

04/04/2025

04/04/2025

Another busy week coming to a close 👍

Many orders filled 📖 and dispatched 🚛 across England 🏴󠁧󠁢󠁥󠁮󠁧󠁿, Scotland 🏴󠁧󠁢󠁳󠁣󠁴󠁿 and Wales 🏴󠁧󠁢󠁷󠁬󠁳󠁿 from our manufacturing base in Northern Ireland.

This also includes our local customers

Cavity Trays, chimney trays, horizontal trays, chimney aprons and lead bespoke items all manufactured this week 😃

02/04/2025

I got 7 reactions on my recent top post! Thank you all for your continued support. I could not have done it without you. 🙏🤗🎉

02/04/2025

I gained 514 followers, created 25 posts and received 37 reactions in the past 90 days! Thank you all for your continued support. I could not have done it without you. 🙏🤗🎉

31/03/2025

Lisnastrain Horizontal Cavity Tray

📖 Overview
These are preformed building components, often made of lead or durable materials, designed to prevent water from penetrating the cavity wall and entering the internal part of a building, especially at vulnerable areas like roof abutments or over concrete ring beams.

🧑‍🏫 Here's a more detailed explanation:

Function:
Water Barrier ☔️
Cavity trays act as a barrier within the cavity wall, collecting any water that pe*****tes the external wall leaf and directing it safely out through weep holes.

Damp Prevention 💦
By preventing water from entering the internal wall, they help to prevent dampness, mold, and potential structural damage.

Specific Applications 📕
They are particularly crucial at areas where a flat, lean-to, or mono-pitched roof meets a cavity wall, or over concrete ring beams.

Materials and Design 🏠
Lead or Durable Materials:
Cavity trays are commonly made of lead or other durable materials like PVC plastic.

Preformed Sections 👍
They are often supplied as preformed sections that can be joined together to form a continuous tray.

Weep Holes 🕳️
They are designed with weep holes to allow collected water to drain out of the cavity wall.

Installation: 🗺️

Proper Placement: 👌
Cavity trays should be installed correctly, ensuring they are positioned to intercept any water that might pe*****te the external wall leaf.

Weep Hole Placement: 🎯
Weep holes must be provided in every horizontal cavity tray to comply with Building Regulation requirements.

Cavity Width: 📏
Ensure the tray is suitable for the cavity width of the wall.
Considerations for Insulation:

If installing cavity trays with partial fill cavity insulation, deduct the insulation material depth to calculate the available 'clear cavity width'.

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