12.5mm Fire Rated Plasterboard (Square Edge)
1.8m x 0.9m | 1.62m² per board
FREE delivery over £500 excluding VAT
12.5mm Fire Rated Plasterboard (Square Edge)
1.8m x 0.9m | 1.62m² per board
FREE delivery over £500 excluding VAT
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Product Description
Product Description
12.5mm Fire Rated Plasterboard (6x3) is a gypsum board built for fire performance, made with an aerated gypsum core reinforced with glass fibre and additional additives that hold the board together at high temperatures. It lines internal walls, partitions and ceilings where Building Regulations, a project specification or a warranty provider call for a fire-rated board in place of standard wallboard.
Each sheet measures 1800mm x 900mm x 12.5mm and covers 1.62m², sold per board. The 6x3 is the smaller, more manageable format in the range: lighter to handle than a full 2400mm x 1200mm sheet and easier to work in lofts, cupboards, stairwells and other tight or awkward spaces. Fire board is denser and heavier than a standard board of the same size, so plan your handling around that, but the 6x3 keeps the weight sensible for one or two people to move.
The performance comes from the core. Under fire, the water chemically bound into the gypsum is released slowly as vapour, drawing off heat and slowing the passage of fire, while the glass-fibre reinforcement stops the calcined core from breaking up. The square edge is the other defining feature: the long edges butt together flat with no recess, giving a continuous, level surface across the wall or ceiling that takes a full plaster skim or direct decoration once the joints are filled.
Fire rated plasterboard goes onto stud partitions, wall linings and ceilings, and into steel encasement and garage-to-house separating walls, wherever a fire-rated lining is specified. Common uses run from loft conversions and HMO room separation to protected escape routes and compartment walls. Install it in line with the board manufacturer's guidance and the tested system set out in your project specification: fire resistance is a property of the complete construction (board, framing, fixings, insulation and jointing), not of a sheet on its own, so it is the system as a whole that delivers the rated performance. As a guide, a single 12.5mm layer contributes up to 30 minutes of fire resistance in the correct system, with higher ratings reached through additional layers or thicker board.
Key Benefits of 12.5mm Fire Rated Plasterboard:
- 12.5mm fire rated gypsum plasterboard for internal walls, partitions and ceilings that need a fire-resistant lining.
- Aerated gypsum core reinforced with glass fibre and additives to maintain integrity at high temperatures.
- Contributes up to 30 minutes of fire resistance as a single layer within a correctly specified system.
- Square edge butts flat for a continuous surface, ready for a full plaster skim or direct decoration.
- 6x3 (1800mm x 900mm) format is easier to lift and manoeuvre than a full 2400mm x 1200mm sheet.
- Covers 1.62m² per board, supplied as single sheets.
- Non-combustible gypsum core, classified Euroclass A2-s1,d0 for reaction to fire.
- Cuts by scoring and snapping, and fixes with drywall screws to timber or metal stud, or dot and dab onto masonry.
- Suits fire-rated partitions, ceilings, steel encasement and garage separating walls when installed to the tested system.
- Insulation UK own-brand board at competitive trade pricing, with bulk pricing available.
Good to know:
- Fire resistance is a system property. The up-to-30-minutes figure applies to a single layer in a correctly specified and tested system, not to the board on its own. For a specific rating (60, 90 or 120 minutes), follow the manufacturer's tested system, usually with additional layers or thicker board.
- Square edge, not tapered. The flat butt edge suits a full skim or direct decoration. For a flush taped-and-jointed finish without skimming, a tapered edge board is the better call.
- Heavier than standard board. The reinforced core makes fire board denser, so it is a firmer lift; the 6x3 size keeps that manageable, though ceilings may still want a board lifter.
- Not a moisture board. For bathrooms, wet rooms or damp, unheated spaces, use a moisture-resistant board, and combine board types where both fire and moisture resistance are required.
- Keep it flat and dry. Store boards flat, off the ground and protected from damp before fixing.
When a wall or ceiling has to hold back fire as well as take a finish, 12.5mm fire rated plasterboard in the 6x3 size is the manageable option: a glass-fibre reinforced core that performs in a fire, in a sheet one or two people can move. For higher ratings, larger sheets or the tapered edge version, see the full fire rated plasterboard range, and for acoustic or moisture-resistant linings see our specialist plasterboard.
Certifications & Standards
Certifications & Standards
Product FAQs
Product FAQs
How many minutes of fire resistance does 12.5mm fire rated plasterboard provide?
What is the difference between fire rated and standard plasterboard?
Can you skim 12.5mm square edge fire plasterboard?
Customer Information
Customer Information
Free delivery on orders over £500 ex-VAT. All orders below £500 (ex-VAT) are subject to a £50 delivery charge.
Ordering & Delivery
How do I place an order with Insulation UK?
You can place an order for delivery anytime online. If you want to collect from our distribution centre in South Yorkshire then please email us your requirements at sales@insulationuk.co.uk
and we will send a payment link and collection instructions. If you can’t see what you are looking for or need more information, then call our team on 03003 034 578 and we can sort your order from there.
How do I know what’s happening with my order and when I will receive it?
When you have placed your order, you will then receive an email confirmation, giving you an order reference number and asking you to double check everything is correct on your order such as delivery address, quantities etc. If there are any amendments to be made, then please reply to your confirmation email with any details.
Once the team has processed the order you will receive an email with a BY delivery date, this is the latest date you will receive your delivery.
Your final email will be a 24/48hr notification, on the day of the delivery if you need a more accurate ETA then contact the office on 03003 034 578.
Do you offer next-day delivery?
Yes, we do on certain lines, you will see our next day delivery products marked as NEXT DAY. Order before 12pm for next day delivery (charges will apply)
How much does delivery cost and how long will it take?
Standard delivery is £50 + VAT for all orders below £500 excluding VAT, above £500 excluding VAT delivery is free. Bespoke deliveries can be made but will incur charges. Each product page gives you an estimate delivery by date. For more accurate information call the team on 03003 034 578
Can I choose a specific delivery date or time slot?
We will endeavour to try and accommodate a preferred date, if you need a delivery on a certain day, then please call us on 03003 034 578.
Do you deliver nationwide?
We deliver across most of the UK; however, some postcodes are restricted due to their location. Check out our delivery map for more information. If you find that you are in area we don’t deliver to, we have access to a wide range of haulage options, please call the team on 03003 034 578 to discuss your requirements further.
Will the driver help unload the insulation products?
Most of our deliveries are made with vehicles with mechanical off-load (known as a moffett or fork-lift), the driver will leave them in a safe place of your choice. They will help as much as they are allowed but are not insured to bring anything into a property.
What happens if my order arrives damaged or incomplete?
In the unlikely event your order arrives damaged, then please contact within 48 hours at sales@insulationuk.co.uk with any images of the damage and the team will be in touch. If there is anything missing, then notify the team within 48 hours on 03003 034 578
What if my order doesn’t arrive and I have paid for trades to be on site, can I claim anything towards the costs I have incurred?
We advise not to have trades booked in and around the day of your delivery. Things can happen beyond our control, and your delivery may be delayed or abandoned. We cannot be held liable for any consequential loss such as tradesman wages etc.
Product Advice & Support
How do I know which insulation product is right for my project?
With such a variety of insulation products, we fully understand making sure you have the right one can seem daunting. Our team have over 50 years of experience in the construction industry and there isn’t a question they haven’t been asked! Speak to our technical team on 03003 034 578 and they will be happy to offer some help and guidance.
Do you offer technical advice or support before I buy?
Yes we do! Just call 03003 034 578 and ask for our technical team and we will be happy to support you.
Product Information & Suitability
Product descriptions on this website are provided as general guidance only and are not a substitute for the manufacturer’s Technical Data Sheet (TDS), fire classification information, and the project’s design/specification requirements. Suitability depends on the full build-up and intended use (including any requirement for encapsulation, coverings, and compliance with Building Regulations and the project fire strategy).
It is the customer’s responsibility to confirm, before ordering, that the product specification and performance are suitable for the intended application by reviewing the relevant TDS and taking professional advice where required. If you are unsure, contact us before purchase and provide your intended build-up so we can confirm what information we can support.
Nothing in this notice limits or excludes your statutory rights
Can I speak to someone to confirm product specifications?
Of course you can! There is also a range of data sheets and guides available on the product pages under Technical Information.
Are your products suitable for both DIY and trade customers?
Yes, they are. If you are new to DIY projects involving insulation,
then we advise to always do your research. We have a handy guides section which may help.
Do you offer fire-rated or eco-friendly insulation options?
Yes, we do. Fire ratings are indicated in the specification table on the product page, and our sustainable range is continually growing.
Pricing & Payments
Do you offer trade or bulk-buy discounts?
We always aim to offer the best price online; however we do offer project pricing for larger orders, speak to our sales team with your requirements on 03003 034 578.
What payment methods do you accept?
We accept all major cards including American Express, as well as Apple Pay, Google Pay and PayPal
Can I set up a trade account with credit terms?
We do offer trade accounts, however there are certain criteria we ask for, and any credit account application is subject to credit checks. Call the team on 03003 034 578 to discuss any credit applications.
Do your prices include VAT?
The website has a toggle at the top right of the page so the prices can be displayed including and excluding VAT. VAT, where applicable, is charged at checkout.
Returns & Cancellations
Can I return unwanted insulation products?
Contact the team via email sales@insulationuk.co.uk with the items you wish to return and any other information. Please note if we you need us to collect any unwanted items,
a collection fee will apply.
How do I arrange a return or exchange?
Contact the team via email sales@insulationuk.co.uk or check out our refund policy.
Are there any restocking fees?
Restocking charges will apply in certain instances, please contact the team via email at sales@insulationuk.co.uk check out our refund policy.
What if I’ve ordered incorrectly or need to cancel my order?
Contact the team via email as soon as possible. The best way to get in contact is to reply to any of the emails we have sent you, they will come straight through to the team and will have any relevant order information already on there.
Installation & Compliance
Do you offer installation services or just supply materials?
We do not offer any installation services; we are a supplier of insulation and building materials.
Can I get a datasheet or certificate of performance for your products?
Yes, data sheets can be found in the Technical Information drop down on the product page.
How should I store insulation products before installation?
There are a variety of insulation products each with their own storage instructions. Generally, please keep them off the ground, in a dry area, away from the elements.
Sustainability & Quality
Are your insulation products environmentally friendly?
This depends on the individual products, data sheets are available,
and any environmental benefits are noted on the product pages.
Do your products help reduce energy bills?
The correct insulation properly installed can reduce heat loss from a building and therefore help reduce energy costs.
Are your products made in the UK or imported?
With such a wide variety of products some are made in the UK and some are imported.
Customer Service & Support
How can I contact your support team?
By phone on 03003 034 578, email sales@insulationuk.co.uk or via our
webchat online
What are your opening hours?
Monday to Friday 8am to 5pm for sales and technical support, orders can be placed on line 24/7
How quickly can I expect a reply to my enquiry?
We aim to respond to our customers as quickly as possible.
Technical Details
- Brand:
- Insulation UK
- Material:
- Gypsum
- Length:
- 1800 mm
- Width:
- 900 mm
- Thickness:
- 12.5 mm
- Unit Coverage:
- 1.62 m²
- Weight Per Item:
- 30 kg
- Edge Type:
- Square
