Reliable, long-lasting and watertight, this Standard 450g GRP Fibreglass Roofing Kit (2.5 Square Metres) is a complete and convenient package that includes all the highest quality materials and tools you need to complete your latest flat roofing project. These 450g kits are ideal for garage roofs, outbuilding roofs, sheds, garden cabins, offices, and more. Available in a range of different sizes from 1m² - 100m² at Fibreglass Supplies Ltd.
These GRP Fibreglass Roof Kits are supplied with everything needed to cover the area required with 1 layer of 450gm² glass fibre mat and 1 layer of dark grey topcoat. A "450g" GRP fibreglass roofing kit means that the weight of the fibreglass matting included per square metre is 450g. Remember, the heavier the matting the stronger the roof is.
Fibreglass is the ideal material for weatherproofing flat roofs laid with plywood, OSB (Oriented Strand Board) or HDF (High Density Fiberboard). The preferred substrate is OSB3 (Oriented Strand Board grade 3), a type of strong, durable, engineered wood panel that's suitable for load-bearing applications in humid conditions.
Kit Without Tools:
Kit With Tools:
We supply an additional 10% in all our kits to make sure you always have enough material to successfully complete your project.
We use the Crystic Roof range of products from Scott Bader in all our Roof Kits, ensuring industry leading materials, manufactured in the UK for your peace of mind.
Please note, a roof constructed in 450g matting is not suitable for balconies or walking on frequently. If you are unsure which weight of kit is right for your project, please give us a call.
Customer Reviews5.05 5.0/5 Based on 3 reviews
All goodReviewed by Nick.9holden on 25 Jul 2026
It is what it is,all good
Top qualityReviewed by Soheil1973jkh on 21 Jun 2026
On time Top quality 100 percent recommend
Excellent product: great serviceReviewed by Tim.clarey on 29 Apr 2026
Super swift dispatch and very comprehensive materials. Got the job done well!
Fibreglass Supplies use Royal Mail, APC Overnight and the National Hazardous Pallet Network for our Next Day Delivery Services.
Royal Mail
Orders of up to 2kg will usually be sent using a Royal Mail First Class Service for National Next Day Delivery.
APC Overnight
Orders over 2kg and up to 30kg will be sent using a Fully Tracked Next Day Service using APC Overnight. Some smaller Roofing Kits that weigh up to 30kg in Total would be sent on this service. This includes Resins, Gelcoats and Topcoats which are classed as Hazardous and are decanted into 5kg Tins or Pales to comply with the Transportation of Hazardous Goods Act.
Pallet Network
All our larger orders by weight would usually be sent using the National Pallet Network. Non Hazardous Items can be sent using either the Pallet Network or APC Overnight.
All Hazardous goods over 30kg (which includes Roofing Kits over 30kg in total weight) are usually sent using the National Pallet Network on a Fully Trackable Next Day Delivery Service.
Click & Collect
All orders are eligible for Click & Collect. Pick up your items conveniently from our Cattedown Store, available Monday to Friday between 7:30 am and 4:30 pm (excluding Bank Holidays).
NB - Please note that our Direct Control of the Delivery Element extends to making sure we pick pack and dispatch all orders on time. As we have no Direct Control over the performance of any individual courier we would not be responsible for refunds due to the late arrival of any order.
We always work hard with customers to overcome any issues that arise so please call us if you do have any concerns with regard to tight delivery deadlines so that we can provide great advice if needed.
Please read our Returns policy laid out below.
Under the Consumer Contracts Regulations 2014 you are entitled to return goods within 14 days of delivery for a refund of the cost of the goods. The delivery costs and any packaging are not included in the refund. The returned goods should be in the original containers and unopened. It is the customers responsibility to pay for the cost of returning goods to our Business Premises.
Some of our products are made to order and as such once ordered are non refundable and non returnable. These include coloured gelcoats, topcoats and resins.
These Consumer Regulations do not apply to business purchases (B2B). However we will always help in any way and look to find a suitable and mutually acceptable solution should any issues arise through the order process.
It is the customers responsibility to understand the suitability of the product before its use. Technical and Safety Data Sheets are available for all products where applicable. These can be found on most product description pages or if not are available on request. If you are unsure please do not hesitate to contact us for expert advice and product suitability and application.
To organise a return please contact us on the following.
