Complete Roof Replacements
Built to Outlast the
Welsh Weather
When repairs are no longer enough, a full roof replacement gives your home decades of watertight protection. We strip back to the timbers, inspect everything, and rebuild your roof using premium materials — so you never have to worry about it again.
★ Over 500 full roof replacements completed across South Wales
What This Service Involves
A roof replacement is one of the most significant investments you can make in your property. Done correctly, it adds decades of protection, improves energy efficiency, eliminates damp problems, and increases your home's market value. Done badly, it creates problems that are expensive and disruptive to fix.
At Gwent Roofing and Building Maintenance, we specialise in full roof replacements for homeowners across Tredegar, Ebbw Vale, Merthyr Tydfil, and the wider South Wales valleys. Every replacement begins with a complete strip-back to the rafters so we can inspect the timber structure, replace any rotten sections, and install modern breathable membrane before re-battening and re-tiling or re-slating.
We do not cut corners. We do not leave old felt in place to save time. We do not skip the membrane or ventilation because it is hidden. Every layer of your new roof is installed to current building regulations and designed to perform for 40 to 60 years.
Our approach is simple: inspect thoroughly, quote honestly, build properly. Whether your home is a stone-built terrace in Tredegar or a rendered semi in Bargoed, we deliver the same standard of workmanship on every job.
Why Patching an Old Roof Costs You More in the Long Run
Many homeowners delay a full roof replacement because of the upfront cost. Instead, they pay for repair after repair — a tile here, a patch there, a bucket in the loft when it rains hard. Over five to ten years, those repair bills add up to more than a new roof would have cost.
Worse, repeated patching allows hidden damage to progress. Rotten timbers weaken the structure. Damp penetrates insulation and walls. Mould develops in spaces you cannot see, affecting air quality and potentially causing health problems for your family.
Old roofs also lack modern insulation and ventilation standards. A roof built in the 1970s or earlier will be losing significant heat, pushing your energy bills higher every winter. A new roof with modern insulation can cut your heating costs substantially.
There is also the resale value factor. Estate agents confirm that a visibly tired roof deters buyers and reduces offers. A new roof is one of the strongest selling points a property can have — it tells buyers they will not face unexpected costs after moving in.
How We Work
Full Roof Survey
We inspect your entire roof structure — externally and from inside the loft. We assess timbers, insulation, ventilation, and identify every issue.
Detailed Specification & Quote
You receive a written specification detailing every material and method. The quote is fixed — no surprises.
Scaffolding & Preparation
We erect scaffolding, protect your property with sheeting, and prepare for a clean, safe strip.
Strip & Timber Inspection
Old tiles, felt, and battens are removed. All timbers are inspected and any rotten or damaged sections replaced.
Rebuild & Finish
Breathable membrane, counter battens, new battens, and your chosen tiles or slates are installed. Ridge, verge, and valley details are completed to the highest standard.
Why Homeowners Choose Us
40–60 Year Lifespan
A properly installed new roof lasts decades. You will not need to think about it again in your lifetime.
Reduced Energy Bills
Modern insulation and ventilation improve thermal performance, keeping your home warmer in winter and cooler in summer.
Increased Property Value
A new roof is one of the highest-return home improvements. Estate agents agree it is a major selling point.
Eliminates Damp & Mould
A watertight roof with proper ventilation stops condensation problems and protects your family's health.
Fixed-Price Guarantee
The price we quote is the price you pay. We absorb any unforeseen costs — that is our commitment to you.
Minimal Disruption
Most roof replacements are completed in 3 to 5 days. We keep noise and disruption to an absolute minimum.
Roof Replacement Materials & Specifications
We offer a full range of roofing materials for your replacement. Welsh slate is the premium choice for properties in the valleys — naturally quarried, incredibly durable, and aesthetically beautiful. We also supply and install Marley, Redland, and Russell roof tiles in concrete and clay profiles.
Every roof replacement includes a breathable roofing membrane (BS 5534 compliant) installed over the rafters. This membrane replaces traditional felt and allows moisture vapour to escape while preventing wind-driven rain from penetrating. It is a critical component of modern roof construction.
We install treated softwood battens at precise gauge spacing matched to your chosen tile or slate profile. Counter battens are fitted where required to create a ventilated airspace between membrane and covering — essential for preventing condensation in the roof void.
Ridge systems can be traditional mortar-bedded or modern dry-fixed using mechanical fixings. Dry ridge systems are now the default recommendation as they resist storm uplift, require no maintenance, and comply with current regulations. We install Manthorpe, Klober, and similar approved systems.
All valley, hip, and verge details are finished using appropriate materials — lead valleys are hand-dressed on site, and fibreglass valleys are available as a lower-cost alternative. Verge caps and clips are mechanically fixed to prevent wind damage.
For properties in exposed locations such as the upper valleys around Ebbw Vale and Blaenavon, we specify enhanced fixings and wind uplift resistance. Every tile or slate is nailed and clipped where required, not simply hung. This exceeds minimum standards but is essential in our local conditions.
Frequently Asked Questions
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