Fibreglass Roofing in Cardiff & Across Wales

Every fibreglass roof we fit follows a methodical process. Cutting corners at any stage compromises the end result, so we stick to the correct sequence every time.

The existing roof covering is stripped back first. If the timber decking beneath has gone soft or rotten, we replace it — there is no point laying a new GRP system over boards that cannot support it. Once the structure is sound, we fix new 18mm OSB3 boarding across the full area to give a smooth, stable surface for the fibreglass to bond to.

Then comes the laminating stage. We lay glass fibre matting across the entire roof, working it carefully into corners, upstands, and drip edges before saturating it with catalysed polyester resin. This step is what separates a roof that lasts five years from one that lasts thirty. Too little resin and you get dry patches; too much and it pools. The ratio needs to be right.

After the base layer has cured, we apply the UV-resistant finishing topcoat — typically dark grey, though other colours are available. Trims, drip edges, and fillets are all formed in GRP as well, mechanically fixed rather than stuck down with sealant. The entire perimeter ends up watertight with no weak points.

On a typical domestic garage or extension in Cardiff, the full process takes between one and three days depending on weather and complexity.

We are based in Cardiff and carry out fibreglass roofing projects across the whole of Wales. Newport, the Vale of Glamorgan, Bridgend, Swansea, Pontypridd, Caerphilly, Penarth, and Barry all fall within our regular working area — though we travel further afield for larger projects.

The same standards apply on every site. Whether it is a terraced house in Splott or a detached property near Cowbridge, we follow the same preparation, lamination, and finishing process. Domestic properties, commercial premises, new builds — the building type changes but the quality of the workmanship does not.

Most of our fibreglass roofing work comes through recommendations and repeat customers. We turn up when we say we will, we keep the site clean, and we do not leave before the job is properly finished. If something is not right, we would rather flag it during the work than have you ring us six months later with a problem that could have been avoided.