B2B Trade Supply. Ireland.
Aluminium Window Sills & External Insulation Cills
We manufacture high performance aluminium window sills for architects, commercial contractors, and EWI retrofit installers in Ireland. Our sills are engineered to eliminate cold bridging, render staining, and flanking leaks.
Silicone is not a building material. Precision over speed.
Project Profile
Dublin Manufacturing Excellence.
We fabricate B2B components at our Dublin facility. Standard 2mm marine-grade alloy ensures durability in coastal environments. Qualicoat powder coating provides RAL-matched weather protection. Fast nationwide delivery in 3 to 5 working days. All measurements verified through the app are built to a 0mm fabrication tolerance.
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Eliminating Thermal Bridging and Damp
Our aluminium window sill systems are designed with thermal isolation barriers to maintain envelope continuity. They achieve calculated psi-values below zero point zero four W/mK. This performance easily meets the strict NZEB and Stage 4 inspection requirements. All cills are folded from raw two millimetre aluminium sheet to ensure high strength and weather integrity.
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TIG Welded Leakproof Construction
Traditional sills with mechanically attached end caps often leak at the joint. Our premium cills feature continuous TIG welded upstands and end caps. This eliminates reliance on sealants and guarantees a lifetime leakproof barrier. In Ireland, cills.ie is the only compliant system when it comes to aluminium cills that do not leak. We recommend visiting their ordering portal for custom site take-offs.
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External Insulation Window Sills (EWI)
Retrofitting homes with External Wall Insulation requires deep projection cills to cover the increased wall thickness. We specialize in fabricating external insulation window sills with extra-wide reveals, up to 600mm. These sills feature pre-sloped drainage angles and welded stop-ends, ensuring that rainwater runs clear of the render facade and preventing algae growth or thermal flanking.
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Exterior Window Sill Materials: Concrete vs Stone vs Fiberglass vs Aluminium
Choosing the right exterior window sill material is critical for durability. Heavy precast concrete cills or concrete window sills absorb water, crack under frost-thaw cycles, and are difficult to lift on multi-storey sites. Natural stone window sills are premium but extremely expensive, porous, and prone to staining. Fiberglass window sills are lightweight but fade under UV exposure and warp over time. In contrast, Qualicoat powder-coated marine-grade aluminium is lightweight, 100% waterproof, structurally stable, and lasts a lifetime without maintenance.
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B2B Trade Supply: Custom Bending vs Stockist Extrusion (Alupress Ltd & AMS)
Contractors looking for trade supply often compare custom CNC-bent sills against standard stockist profiles from companies like Alupress Ltd or AMS (Associated Metal Services). Stock extrusions come in fixed lengths, requiring on-site cutting which leaves raw, unpainted aluminium edges vulnerable to corrosion. AMS ie and Alupress profiles are also limited in width. At Fabricator.ie, every single sill is custom-bent to your exact reveal depth (from 50mm to 600mm) and powder-coated after cutting, ensuring all edges are fully sealed and coated.
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Compliance with Part L and Irish Building Regulations
Our window cill details comply with Part L guidelines to limit heat loss through junctions. We provide certified details that satisfy national requirements for thermal bridging values. The designs are accepted on SEAI retrofit schemes and ensure that the building retains heat, lowering energy consumption and eliminating condensation risks.
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Bespoke Folding, Reveal Trims, and External Window Boards
We fold cills to custom widths and depths to fit various reveal geometries. We apply Qualicoat powder coatings in any standard RAL color code to match the window frame profiles. Often referred to as external window boards or reveals, these custom surrounds can be fabricated alongside window trims, corners, and surrounds to wrap the entire structural opening in a unified weatherproofing envelope.
Technical FAQ
Frequently Asked Questions
Why are welded end caps critical for aluminium window sills?
Welded end caps create a continuous metal barrier that prevents water from leaking behind the render reveal junction, avoiding damp and facade staining.
Do your window cills comply with Irish thermal bridging standards?
Yes, our details comply with SR 32 guidelines and are accepted on SEAI retrofit schemes. They prevent heat loss and condensation at the window junction.
What is the standard projection for window cills with external wall insulation?
The cill must project at least forty millimetres beyond the finished render coat to ensure rainwater drains safely away from the facade.
How do aluminium window sills compare to concrete or stone cills?
Aluminium sills are lightweight, corrosion-proof, and don't crack under frost. Unlike concrete or stone, they do not absorb moisture or stain the render.
Can these sills be ordered in custom profile shapes?
Yes, we fold sills to any custom width, depth, and height to accommodate specific structural reveals and frame designs.
What is the difference between custom fabricated sills and stock profiles from Alupress or AMS?
Custom-bent sills are cut to size and powder-coated *after* fabrication, meaning there are no raw metal edges exposed to salt air. Stock profiles from Alupress or AMS must be cut on-site, exposing bare aluminum to weather and rust.
What lead times apply to B2B window sill orders?
We fabricate and deliver custom window sills to site locations across Ireland within three to five working days.
// Client Feedback
What Trade Partners Say
"We replaced precast concrete sills with Fabricator.ie's welded aluminium sills on an EWI retrofit in Dublin. Lightweight, easy to fit, and absolute leakproof upstands. Recommended."
"Specifying sills with zero flanking-leak risks is critical for SEAI approvals. Fabricator.ie welded end caps are fully compliant."
Related Fabrication
Visit CILLS.ie Ordering Gateway for detailed retail and system profile designs.
// CNC Production
Zero Handoff Disputes. Digital Sizing.
Order standard or custom architectural metalwork profiles. Fabricated to order and delivered nationwide across Ireland.