Galway's older terraced homes along the Claddagh and modern estates out the Monivea Road both end up with flat roof sections that take a beating from salt-laden Atlantic winds and heavy horizontal rain. GRP fibreglass bonds directly to timber or concrete decks and gives a seamless finish that stands up to the constant wetting and drying cycles here, while EPDM sheets handle movement better on buildings that have settled over decades. The key is getting the falls right and terminating the membrane properly at abutments so water does not track behind the edge detail during winter storms.
Many homeowners look at SEAI grants when they replace a flat roof because improving insulation can lift the BER rating, but the grant only applies if the whole system meets the current U-value and the installer leaves the roof accessible for inspection. On properties near the docks or Salthill the salt air eats through poorly fixed flashings within a few seasons, so we always use stainless or aluminium termination bars rather than relying on mastic alone. Edge cases include listed buildings where you cannot raise the roof height, forcing thinner insulation boards and careful detailing around existing chimneys.
We see repeated failures where previous contractors skimped on the primer or tried to overlay new membrane straight onto failed bitumen without stripping it back. That traps moisture and guarantees blisters within two winters. Proper jobs start with a moisture survey and often require new insulation boards to create the correct falls before the final membrane goes down.
Technician insight
In Galway the thing that catches most people out with Flat Roofing (GRP Fibreglass & EPDM) is the salt air eating the fixings on older stone gables along the Claddagh if you use standard galvanised edge trim instead of stainless or aluminium.
Terraced house near the Claddagh
The owner had recurring leaks at the rear flat roof where it met the stone gable. We found the old bitumen had failed at the edge and water was running behind the wall plate. We stripped back two metres, fitted new tapered insulation and a full GRP system with stainless termination bar. The roof has stayed dry through the last two winters.
Flat Roofing (GRP Fibreglass & EPDM) Services We Offer
✓GRP Fibreglass Flat Roof Installation
Hand-laid GRP system applied over new insulation boards with full perimeter detailing suited to Galway's wind exposure.
✓EPDM Membrane Replacement
Full strip-off and new 1.2 mm EPDM sheet mechanically fixed or adhered, with upgraded edge trims for salt air resistance.
✓Flat Roof Leak Repairs
Targeted cut-outs and patch repairs using compatible GRP or EPDM materials to stop water ingress without replacing the entire roof.
✓Flat Roof Insulation Upgrade
Adding tapered insulation boards to improve drainage and thermal performance on existing flat roofs in older Galway properties.
✓Flat Roof Drainage Installation
New outlets, gutters and overflows fitted during membrane work to handle the heavy rainfall volumes common on the west coast.
Flat Roofing (GRP Fibreglass & EPDM) Cost in Galway, County Galway
| Service | Typical Range | What Affects It |
|---|---|---|
| Small domestic balcony or extension roof | €1,200–€2,400 | Size, access from ground level and whether deck needs replacing |
| Typical 40–60 m² house flat roof | €4,800–€8,500 | Strip-off, insulation upgrade and membrane choice |
| EPDM overlay on sound existing deck | €65–€95 per m² | Only possible when moisture survey shows no trapped water |
| GRP edge detail repairs | €380–€650 | Per linear metre of failed flashing or termination |
Ranges are typical for Galway, County Galway and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Survey
We measure the roof, check the deck condition and note any abutment details on properties around Galway city and nearby villages.
- 2
Substrate Preparation
Remove failed coverings, repair timber or concrete, fit new insulation and create proper falls before any membrane is applied.
- 3
Membrane Application
Lay GRP or EPDM according to the chosen system, including all trims, upstands and outlets with correct fixings for wind uplift.
- 4
Final Inspection
Check every seam and termination, test drainage, and leave the roof ready for the owner to inspect before we leave site.
Pricing
Most domestic flat roof work in Galway falls between €85 and €140 per square metre depending on access, substrate repairs and whether insulation is upgraded.