Is Your "New" Roofline Just Hiding a Rotting Problem?
If you have started getting quotes to replace your fascias and soffits, you might have noticed a significant price disparity.
One company quotes £2,500, while another offers to do the job for just £1,200.
Why is there such a gap? It almost always comes down to one critical methodological difference: Capping Over vs Full Replacement.
At Roofline Replacement, we believe in total transparency. While a cheaper quote is tempting, it is vital to understand that in the roofing industry, you truly get what you pay for.
In this guide, we’ll explain why cladding over wood fascia is often a recipe for disaster and why a full replacement is the only way to guarantee the safety of your home.
What is "Capping Over"? (The Cover-Up Job)
Capping (also known as over-cladding) is a technique where an installer simply nails a thin layer of uPVC plastic (usually 9mm) over your existing timber boards. They don't remove the old wood; they just hide it.
To the untrained eye, the finish looks clean and white. But underneath that shiny plastic, the original problem remains—and usually gets worse.
The 3 Hidden Dangers of Capping Over
You might save money today, but capping often leads to expensive repairs down the line. Here is why:
1. You Trap the Rot
The main reason homeowners upgrade their roofline is that their existing timber is old, flaking, or rotting. If you clad over that timber, you seal the rot inside.
Without ventilation, moisture becomes trapped between the old wood and the new plastic. This creates a "sweating" effect that accelerates fungal growth. Eventually, this rot can spread from the fascia to your rafter feet (the structural beams of your roof). Fixing structural roof damage costs significantly more than the original fascia installation.
2. Your Gutters Won’t Work Properly
Your guttering is designed to be installed at a specific angle to collect rainwater from your roof tiles.
The Issue: When you add a capping board to the top of existing wood, you increase the fascia profile thickness.
The Result: This pushes the gutters further out from the roof edge. Rainwater often overflows the gutter or runs behind it, resulting in damp patches on your masonry and potential foundation issues.
3. Insecure Fixings
When you opt for a full replacement, the new boards are screwed directly into solid roof spars. When you cap over, the installer is often nailing the new plastic into the old, soft, rotting wood.
Over time, as the encased wood deteriorates, the nails lose their grip. It is not uncommon to see capped fascias blown loose or rattling loudly in high winds.
What is Full Replacement? (The Permanent Fix)
A full replacement is exactly what it sounds like. We don't cover anything up. We strip the roofline back to the bare bones of the house.
Our 4-Step Process:
- Strip Down: We carefully remove all old timber fascias, soffits, and guttering.
- Inspect: We check the "rafter feet." If there is any rot here, we cut it out and treat the timber with preservatives.
- Ventilate: We install a modern eaves ventilation system to let your roof breathe, preventing damp in your loft.
- Install: We attach heavy-duty, 18mm thick uPVC boards directly to the rafters.
At a Glance: The Cost of "Cheap" vs. Quality
| Feature | Capping Over (The Cheap Option) | Full Replacement (The Right Way) |
| Material Thickness | Thin (9mm) cosmetic board | Thick (18mm) structural board |
| Old Timber | Left to rot underneath | Completely removed |
| Ventilation | Often blocked/reduced | Improved with new vents |
| Lifespan | 3–5 years (before problems arise) | 20+ years |
| Risk Factor | High (structural rot, damp) | Zero |
The Verdict
We understand that cladding over wood fascia is cheaper upfront. It uses less material and takes half the time. However, it is a false economy.
If you cap over rotten timber today, you will likely have to pay someone to rip it all off and do it properly within a few years. By choosing a full replacement roofline now, you are investing in a solution that lasts for decades, adds value to your property, and requires zero maintenance.
Summary: Questions to Ask Your Installer
Don't get caught out by a vague quote. Before you hire anyone, ask these three questions. If they hesitate, walk away.
- "Will you remove all the old timber, or just cover it?"
- "Do you inspect the rafter feet for rot and treat them if necessary?"
- "Is your quote for 9mm capping boards or 18mm replacement boards?"
Ready for a proper job that lasts?
At Roofline Replacement, we never cap over. We only do it right.
Get Your Free Full Replacement Quote Today
