Fibreglass Roof

Irish Traveling

Hi all,

Is anyone familiar with fibeglass roofs? I got a flat roof dormer extension built a few months ago and was very happy with the work. However, a large crack developed on the render (timber farme with sand/cement finish). As a result the builder removed the render and replaster. Plaster work finish turned out fine.

Since this work as done I can hear the wind getting in under the fibreglass roof causing a lot of cracking / creeking. I've only noticed this since the render work was done.

I am assuming that the plaster could not get up under the lip of the roof (50 mill lip approx).

Am I correct in saying that this should be sealed and air tight?

BryanF

Is it a warm roof or a cold roof?

Can you put up the drawings The builder was working to?

Did an Eng or arch inspect/visit during construction?

Irish Traveling

It's a warm roof. 100mm between the rafters and 60mm under if I recall correctly. I don't have the drawings to hand.

Both eng ad arch inspected during construction. However, they did not inspect after the remedial works.

Irish Traveling

Am I correct in saying it should not allow wind under it?

sydthebeat

Irish Traveling wrote: »

It's a warm roof. 100mm between the rafters and 60mm under if I recall correctly. I don't have the drawings to hand.

Both eng ad arch inspected during construction. However, they did not inspect after the remedial works.

thats a 'cold roof' construction, not a 'warm roof'... these are technicial terms for types of constructions.

cold roofs are supposed to have ventilation between the insulation and roof covering.
warm roofs dont require this

Irish Traveling

sydthebeat wrote: »

thats a 'cold roof' construction, not a 'warm roof'... these are technicial terms for types of constructions.

cold roofs are supposed to have ventilation between the insulation and roof covering.
warm roofs dont require this

Thanks for reply.

I was lead to believe that it was a warm roof. I may not be correct on the construction details above.

What is the difference between to two?

sydthebeat

technically, a warm roof is one where the condensation point is located to the external of the structural timbers.

In order to achieve this, a warm roof usually has insulation over the structural timbers.