Domestic Fibreglass GRP Flat Roofing FAQs

A GRP fibreglass roof is guaranteed for a minimum of 25 years, with a life expectancy of 100 years. You only need to install this once! They have a vastly longer lifespan and are simply more durable. They can be both aesthetically pleasing and functional too. They can even be walked on.

Initially yes however the long term benefits will be obvious as it will outperform the felt roof – you won’t have to worry about replacing it again during your lifetime!

A fibreglass roof has no joints or seams. We use a system of fibreglass and resins and topcoats to form one continuous layer. Therefore even around awkward shapes and edges the GRP system is 100% watertight.

Yes, this is called a ‘warm roof’. We can install varying amounts of insulation into the roof to suit your requirements as most flat roofs aren’t very well insulated.

Yes. If you specify the roof is to be walked upon we use a heavier grade fibreglass and finish with a non-slip top coat.

No, your GRP roof is maintenance free, however dust and dirt can easily be washed off if you want to keep it looking as good as new. Soapy water is sufficient.

There are many factors to be considered in calculating the cost of installing your fibreglass flat roof.  Bottom line is that it will work out much cheaper than any conventional flat roofing material over its very long lifespan.

There are fibreglass roofs in existence today that were installed over 50 years ago. Yes really. With today’s advanced materials, a well-laid fibreglass roof installed by experienced professionals like Liquid Applied Membranes, will outlast just about any other roofing system.

We offer a full spectrum of colours for your fibreglass flat roof. You can even have custom colours to your own specification. Please ask for further colour swatches.

On average most jobs can be completed one to two days for domestic customers.  A high quality standard of work and finish is our priority.  We promise to give you a realistic time estimate. We also promise to cause you the minimum disruption.

GRP fibreglass roofing is incredibly safe and very, very waterproof. The materials are cold-applied so there is never any danger from flames as used in other applications. If you require features such as non-slip grit, fire retardants etc. just ask.

Any amount of insulation can be installed if needed – thermal or acoustic.

Fibreglass flat roofing should have a ‘fall’ to a drain or gutter, preventing pooling.

Fibreglass flat roofing is easy to repair, if needed. We have a full fibreglass roofing repair service.

Fibreglass roofing will last at least three-times longer than a conventional roof, making it far more environmentally friendly and a significantly cheaper option in the long run.

Greater London, London, South East, Kent, Essex, Surrey.

Yes this process is also known as GRP roofing – or glass reinforced plastic.

No you cannot fibreglass directly onto roofing felt with conventional polyester resins which are used in fibreglass roof installations. The fibreglass system creates a thermal chemical reaction whilst it is curing which softens the roofing felt or bitumen preventing a full bond between the two materials. In most applications where roofing felt is present the felt is over boarded with a OSB recovery board which is mechanically fixed over the top of the felt. Alternatively a polyurethane resin system incorporating fibreglass can be used which is designed to apply directly on to felt or bitumen based materials using a suitable primer. See 3M Scotchkote Polytech EC/UV system.

Yes it is common practice to overboard a felt roof system and then apply fibreglass to the new boards. The board is referred to as flat roof recovery board.

Yes fibreglass can be applied to most materials including wood, steel, and plastic all masonry types including concrete.

No you cannot fibreglass directly onto asphalt with conventional polyester resins which are used in fibreglass roof installations. The fibreglass system creates a thermal chemical reaction whilst it is curing which softens the top of the asphalt preventing a full bond between the two materials. In most applications where asphalt is present the asphalt is over boarded with an OSB recovery board which is mechanically fixed over the top. Alternatively a polyurethane resin system incorporating fibreglass can be used which is designed to apply directly on to asphalt with a suitable primer. See 3M Scotchkote Polytech EC/UV system.

Yes you can fibreglass onto lead using the correct primer.

Yes you can fibreglass onto an asbestos roof however we recommend that any works involving asbestos are carried out by a qualified contractor who has the necessary training and expertise to carry out this type of work.

Sometimes soil pipes or vent pipes can be in very inconvenient places like in the middle of a large roof. This may mean you will have to allow for expansion and contraction of the roof deck and fibreglass against the pipes.

A warm roof is a flat roof with the insulation on top of the decking, not in the roof void. The roof system is then fitted directly onto this or onto a further decking.

No the integrity of the covering will not be affected , although standing water will attract dirt and can start to look unsightly if not cleaned from time to time. It would be a good idea to have the falls improved/ increased whilst the flat roof is being replaced. This is something we would advise you on at the quoting stage.

Yes, light foot traffic would not be a problem, although we would incorporate an anti-slip surface onto the final coating.

Not all GRP roof systems are fire rated, although it is often assumed that they are.

We use a smooth dark grey topcoat as standard, although other colours are available on request. As the system is moulded in situ using modified Polyester resins and glass fibre matting, the roof covering has no joints or seams.

The liquid roofing products we supply have guarantees that range from 5 to 25 years.

Liquid roofing can be used on virtually any substrate, but it is mainly used on flat or pitched (metal or asbestos) roofs.

It will be dependent on the type of project, but we will advise as to what system will be most suitable from all the leading brands of liquid roofing.

Building regulations state that if you are refurbishing more than a third of your roof, the insulation must be upgraded to meet the latest thermal requirements.

Yes, it is the perfect material as it is very hard wearing and is suitable for heavy usage, you can overlay with a variety of items like timber deck, paving slabs etc.

This would depend on whether you are completely changing the roof appearance or making a roof into a roof garden or balcony; if in any doubt call your local planning department. If your roof is in need of insulating there is a Part L regulation to comply to

20% booking deposit. Full balance payable upon completion.

No, we offer a free no obligation to buy site survey, the roof will be measured and we will give you a report on the roof, demonstrate the product, answer any questions and leave a price.

No you do not always need to see one of our pricing surveyors, we can give a rough price over the phone and look at roof on Google Earth.

No, we believe our roofing systems offer real value for money, when you consider the technical advantages over other systems it compares very well.

Fibreglass roofs are extremely resistant to UV damage, some fading of the topcoat may occur over the years as the sun takes its toll but this is aesthetic, and can be re top coated if necessary.

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