Question: Can you overlay a Fibreglass roof?

GRP (fibreglass) is an excellent flat roofing material but cannot be used as an overlay, it requires brand new substrate. We offer built up felt roofing which employs a 2 layer system which provides excellent insulation in addition to being very durable.

Can you fibreglass over a fibreglass roof?

Indeed, recoating a fibreglass roof is a fairly involved process, which requires you to thoroughly sand and clean the existing topcoat, before applying the new layer with precision and accuracy. As such, it is generally best to leave fibreglass roof recoating to experienced professionals.

How many layers of fibreglass do I need for a flat roof?

On the roof size you have selected you can use 2 layers of 450gm fibreglass matting.

Can you overboard an existing flat roof?

It depends on whether the roof is a cold ventilated roof OR to be upgraded to a warm flat roof. If it is a cold flat roof then you need to remove the felt (always)…if the deck below is structurally sound then you can overboard (maybe with some minor repairs).

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Can you walk on a fibreglass roof?

Yes, a Fibreglass Roof can be walked on. Depending on the volume of foot traffic expected for the roof to take, this will determine the weight of matting that should be used in the construction of the roof.

Is fibreglass good for flat roofs?

Fibreglass is a newer roofing system that lends itself best to flat roofing but is also suitable for pitched roofs in some applications. Fibreglass is much more durable than felt and stronger too. … A fibreglass roof will last for more than 20 years and it’s less likely than felt to develop a fault.

How long does a fibreglass flat roof last?

Fibreglass roofing which is also known as GRP (Glass Reinforced Polyester) Roofing, can last for 30 years or more, so in longevity, it is close to EPDM.

How thick should fiberglass roof be?

GRP roofing comes in slightly different thicknesses a standard 450g/m roof laminate installed onto OSB 3 18mm T+ G boards is rated (approx.) 13.3 kg/m² (OSB 18mm T + G 11kg/m²) weather tightness (excerpts from BBA Certificate).

Why is my fibreglass roof leaking?

Leaks are caused in a fibreglass roof for a multitude of reasons. Water ingress has developed into a leak, this could be from a crack in the top coat, pinholes, faulty flashing or cracked rendering. You will need a GRP roofing specialist to conduct a roof survey to trace the fault or faults.

Can you lay EPDM over Fibreglass roof?

ClassicBond EPDM is best bonded on to timber surfaces such as roofing grade plywood or OSB3 (Oriented Strand Board) sometimes called sterling board. ClassicBond can also be bonded to light weight concrete and other non porous surfaces such as Fibreglass and tissue faced insulation.

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Can you put new felt over old felt on flat roof?

So the answer is no, you cannot. You should remove the old shingles and felt, and then carefully go over the roof deck removing every last nail or staple left over from the old roof. Then you make repairs to the roof deck; replace any rotted decking. Then you lay down new felt (it comes in long rolls).

What can you cover a flat roof with?

Tiled. Asphalt tiles, similar to roofing shingles, may be used to cover a flat wood roof. The project is possible at a do-it-yourself level for the intermediately skilled. The project requires a layer of roofing felt or paper directly attached to the wood with staples or roofing nails.

What are the disadvantages of fiberglass?

Fibreglass last a long time, it can be coloured, shiny or dull. It is low maintenance, anti-magnetic, fire resistant, good electrical insulator and weatherproof. The disadvantages is that it needs to be re-gel coated about every five years and can result in airborne fibres which may be an issue to asthma sufferers.

Are fibreglass roofs any good?

Fibreglass roofing systems are known to be durable, have excellent longevity and high performance. While Fibreglass roofs are a newer edition to the roofing industry, they have a greater life expectancy of roughly 20-30 years.

Can you fibreglass a roof in the rain?

Rain interferes with the fibreglass resin and can alter its properties. If it starts to rain, don’t continue working. Instead, stop what you’re doing and cover any resin that you’ve applied with a waterproof sheet.

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