A Step by step guide on a typical Fibreglass Flat Roof installation.
The Starting point
We start this example with a poorly fitted GRP Flat Roof that is clearly not draining correctly! The Outlet, in the top left hand of the photograph was higher than the level of the roof decking so this roof was never going to drain properly.
A roof over a roof?
Once we started the removal process, we quickly realised how poor the previous installers had fitted this roof. The OSB boarding under the Fibreglass covering was soaking wet, and totally rotten. It was literally breaking into pieces. Underneath the OSB you can see the original Felt Roof that the previous installers didn’t bother to strip off! We are quite sure that this original roof was laminated in the rain so it was never right from day 1.
What lies beneath!
To our amazement, once we’d removed the existing Fibreglass covering, and all the rotten OSB boarding, we found that under the Felt roof there was yet another roof covering!
Once again this roof doesn’t disappoint with the surprises! It just goes to show, as experienced as you may be, you never really know whats underneath an old flat roof, and why its ALWAYS best to find out. Here we have the ridiculous combination of Slate Tiles and built up Roofing Felt!
The big clean up
Here you can see we slowly and carefully removed all the debris and every single roof covering this building has ever had! Fortunately, the planking that was underneath all this mess was unbelievably ok after botch job after botch job.
Now we’re getting somewhere! As you can see, the roof DID actually flow towards the outlet in the top left hand corner of this picture! The planking was all extremely sound, and the developer wanted to insulate this roof from underneath, so we thoroughly checked the entire roof deck for any water damage, and confirmed it was sound and decided to build our roof from this point.
And then there was light!
We carefully cut out an aperture for the skylight, and made the relevant structural modifications to the Roof Joists to ensure it didn’t sag and stayed put! We also thought it best to really make sure this roof drained properly so we added some serious firing pieces to ensure all the water drained away perfectly.
A perfect fit
We then plasterboarded the inside of the aperture to make sure everything was aligned correctly to allow maximum sunlight into an otherwise quite dark room.
All decked out
Our next task was to give this roof a deck. We only ever use OSB boarding, as Plywood is far too smooth and Fibreglass doesn’t adhere well to smooth surfaces. OSB is slightly textured so it’s the ideal substrate for GRP Roofing applications. We used tongue and groove interlocking boarding to create a perfectly flat joint between the boards to allow the best possible drainage, and substrate to laminate our GRP system onto.
It was quite clear that no matter what was thrown at this section of the roof over the years was never enough to create a water tight junction between the parapet and this adjoining wall. It was thick with bitumen and debris so we stripped it all back to this point so we could ensure to a perfect seal.
Using OSB3 and concrete fixings, we boarded the entire parapet and used our own design and manufactured Edge Trims and Flashing system to create this junction.
Lead apron in keeping with the street
I suggested to our client that a lead apron would be more in keeping with the rest of the street, and that we could easily incorporate this into the roof design.
Our unique edge trim and flashing system
Since we started out in 2005, we have always hand made our Edge Trims and Flashings from exactly the same materials as we laminate to the decking. All Fibreworx roofs are completely consistent in materials used. A perfect bond between the laminate on the decking and the all important edge trims and flashings. It’s all made from the same high quality Fibreglass Matting and Lloyds approved Class2 Fire Retardant Resin.
Only the best materials
Our fibreglass laminate system is created from 600gsm Fibreglass Matting, and Lloyd’s approved Class2 Fire Retardant Resin which bonds perfectly to the edge trims and flashings. We then cover the Fibreglass Laminate with our high performance Flowcoat in our signature dark grey. Where every other roofing system has historically failed, ours excels.
No more trouble
The Fibreworx system perfectly takes care of this troublesome parapet/wall area, which is now perfectly boxed in, laminated and sealed for life.
Fit and forget
Yet another happy customer, and another great roof. Guaranteed to perform for a life time.