New Roofs Knocklyon
High-Performance Roof Replacements & Re-Roofs
Replacing a roof in Knocklyon is an essential structural investment that protects your home for the next half-century. Most residential estates across Knocklyon—including Delaford, Dargle Wood, Knockcullen, Beverly, Ashton, and Lansdowne—were constructed between the early 1970s and late 1980s.
Today, these original roofs are between 35 and 55 years old. Exposed to mountain-fringe rain and sharp winter frosts, their original factory-grade materials have reached the end of their design lifespan. Continuing to pay for piecemeal patch repairs becomes a waste of money when the underlying bitumen felt has turned to dust, original fixing nails have corroded, and concrete tiles have become porous.
At AD Roofing, Augustine Doherty and our team specialize in complete roof replacements across Knocklyon. We strip failing roofs down to the bare rafters and rebuild them with heavy-duty breathable membranes, pressure-treated structural battens, high-durability tiles or slates, and maintenance-free dry-fix systems. Every complete new roof installation is backed by our 15-year written guarantee.
What Our Full Roof Replacement Package Includes
We never cut corners by overlaying old materials or skipping modern ventilation standards. Every complete roof replacement we undertake in Knocklyon includes:
Compliant Scaffolding Setup: Fully engineered access scaffolding erected and dismantled safely in accordance with Irish HSA standards, protecting your property and boundary lines.
Complete Strip-Down to Rafters: Total removal and legal disposal of old concrete tiles, rotted timber battens, and perished bitumen felt down to the bare rafters.
Structural Timber Assessment & Repair: Augustine personally inspects your load-bearing rafters, purlins, and wall plates, replacing any water-damaged timber with structural, pressure-treated wood before new work begins.
High-Performance Breathable Membrane: We install heavy-duty vapour-permeable underlay (such as Tyvek Supro) that repels driving rain while allowing indoor attic moisture to escape naturally.
Pressure-Treated Timber Counter-Battens: Pressure-treated timber battens spaced with precision to guarantee correct tile overlap and maximum structural rigidity.
Premium Tiles or Slates: Installation of heavy-duty concrete interlocking tiles (e.g., Redland, Marley) or high-grade slates, secured with non-corrosive fixings.
Mechanically Fixed Dry Ridge & Dry Verge Systems: Maintenance-free dry-fix systems that clamp ridge caps and edge tiles securely against gale-force winds, eliminating cracked sand-and-cement mortar forever.
Code 4 Milled Leadwork: Custom-formed lead valleys, chimney flashings, aprons, and roof abutments hand-dressed for complete waterproofing.
Spotless Site Cleanup: All construction waste and old tiles cleared into our own skips, leaving your driveway, pathways, and gardens completely clean.
15-Year Written Guarantee: A direct, personal written guarantee covering materials and workmanship, signed by Augustine Doherty.
Why Dublin Chooses Us For Re-Roofs
Personal Accountability: Augustine Doherty On Site
With AD Roofing, Augustine Doherty works on your roof. Augustine carries out your initial physical survey, writes your itemised quote, and works on-site alongside his own uniformed crew until the final ridge tile is locked in place. You deal directly with the business owner at every stage of the project.
Tile & Slate Options for Knocklyon Homes
Concrete Interlocking Tiles (Marley / Redland):
The most popular, durable choice for family homes across Delaford, Beverly, Ashton, and Scholarstown. Highly impact-resistant, cost-effective, and engineered to lock tightly together against severe wind uplift. Available in smooth grey, terracotta, and dark brown profiles.
Fibre-Cement Slates (Tegral / Rivendale):
A lightweight, uniform slate alternative that delivers a sleek, clean finish without the heavy structural weight of concrete tiles. Ideal for hipped roofs, extensions, and modern roofline renovations.
Natural Roofing Slates:
The premier option for character properties and period cottages along Knocklyon Road and Old Firhouse Road. Natural slate delivers outstanding durability and an authentic heritage finish that lasts upwards of 80 to 100 years.
Seamless GRP Fibreglass (Flat Roofs):
The premier waterproofing solution for rear kitchen extensions, porches, and garage flat roofs. It forms a seamless, joint-free surface that will not blister, split, or rot under standing water.
When Does a Knocklyon Home Need a Full Roof Replacement?
If your roof is approaching 40 to 50 years of age, several structural failures begin to occur simultaneously:
Porous Concrete Tiles Suffering Frost Spalling:
The standard concrete interlocking tiles widely installed across Delaford, Dargle Wood, and Beverly have lost their protective factory slurry coating after decades of weather and heavy moss growth. The tiles absorb rainwater like sponges. During sharp winter frosts, that trapped moisture expands, fracturing tile edges and shedding heavy grit that continually blocks gutters.
Disintegrated Bitumen Underlay Felt:
Original 1970s and 1980s roofs relied on traditional black tar-paper bitumen felt. Decades of attic heat in summer and freezing temperatures in winter turn this material paper-thin and brittle. The felt tears away from the rafters, sagging and crumbling to dust. Once wind-driven rain pushes past an aging exterior tile, there is zero secondary waterproof barrier left to stop water soaking into ceiling insulation and plasterboard.
Rotted Timber Battens & Corroded Nails:
Decades of condensation and minor water seepage rust through original fixing nails. Tiles slip down the pitch in heavy winds. At the same time, the softwood timber battens rot and soften, reaching a stage where replacement tiles cannot be nailed down securely.
Cracked Sand-Cement Verges and Ridges:
Original ridge caps and gable verge edges were bedded in traditional sand-and-cement mortar. Continuous structural movement, thermal expansion, and frost shatter this mortar over time. Crumbled mortar chunks slide down the roof, leaving edge tiles exposed to being torn off during gale-force mountain squalls.
Photos Of Our Recent Roofing Jobs
Frequently Asked Questions
How long does a complete roof replacement take on a semi-detached house in Knocklyon?
For a standard 3- to 4-bedroom semi-detached home in estates like Delaford or Beverly, a complete strip and re-roof usually takes 3 to 5 working days, depending on weather conditions. We work in controlled sections to ensure your home remains completely dry and weatherproof every night of the project.
Do I need planning permission to replace my roof in Knocklyon?
In the vast majority of cases, replacing an existing pitched roof on a domestic house is classified as "Exempted Development" by South Dublin County Council, provided you keep the original roof profile and do not alter the height or pitch.
What is the advantage of a Dry Verge system over traditional mortar verge edges?
Traditional sand-and-cement mortar on gable edges cracks and falls away after 10 to 15 years due to natural vibration and frost, exposing edge tiles to wind lift. A modern Dry Verge system uses individual interlocking polypropylene units that mechanically screw each tile down to the timber battens, protecting your roofline permanently without ever needing mortar repointing.
Any Questions?
Ask Us
Request Your Free Roof Replacement Survey in Knocklyon
If your roof is leaking repeatedly, losing tiles, or passing its 40th year, contact Augustine Doherty today for straight, honest advice and a detailed written quote.
Additional Roofing Services We Offer
Looking for more than a new roof? From emergency leak detection and chimney repointing to complete slate and flat roof replacements, we're the Dublin Roofers that handle everything from start to finish.
