Fibreglass Roofing: A Step-By-Step Guide

We've put together this step-by-step guide to give you a basic understanding of the fundamentals of Fibreglass (GRP) Flat Roofing. From 1st September 2016 - 30th September 2016, you can save a massive 20% on all our roof trims online!

Fibreglass Flat Roofing

A properly laid fibreglass roof (also known as GRP Roofing), will last for at least 30 years with no measurable deterioration. The roof must be laid onto a dry deck, in dry conditions, at a temperature not below 5°C. The resins and top coats should be suitable for use in GRP Roofing - the label on your resin should give you this information. Typically two people can strip, re-deck, laminate and top coat a roof of about 20 square metres in one day. Always try to plan starting the roof when a settled period of weather is forecast.

Please note: This guide relates only to the application of the GRP laminate and top coat.


Decking

The decking boards should be Sterling OSB3 tongue & groove. They should be fixed to the roof structure using ring shank nails or screws with a minimum penetration of 25mm, which should be used at 300mm centres down the length of each joist covered by the boards. When laying tongue and groove boards, ensure the gap between the boards is facing up, so it can be reinforced by the resin that runs into it when the laminate is laid. All the boards must have their joints staggered to increase the strength of the roof (see below).

Now you will need to form the edge detail with various preformed edge Trims.