How to Insulate a Floor
Learn how to insulate a floor effectively. Explore different floor types, best insulation materials, costs, installation methods, and key benefits.
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Trusted UK Supplier
Best selling
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Most popularSaleCelotex
Celotex PIR Insulation Board - 2400mm x 1200mm - All Thicknesses
From £11.70(Exc. VAT)£12.64(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Most popularSaleGeneral Purpose
From £4.50(Exc. VAT)£4.95(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Most popularSale
Rockwool
Rockwool RWA45 Slab - 1200mm x 600mm - All Thicknesses
From £22.50(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Most popularSale
Knauf
Knauf Loft Roll 44 - All Thicknesses
£29.76(Exc. VAT)£32.84(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Most popular
Ecotherm
Ecotherm Eco-Versal PIR Insulation Board - 2400mm x 1200mm - All Thicknesses
From £13.00(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Foamglas
Foamglas® Perinsul HL - All Thicknesses
From £150.00(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Knauf
Knauf Acoustic Partition Roll - 600mm Width - All Thicknesses
From £43.17(Exc. VAT)Unit price /£0.00(Exc. VAT) -
Kingspan
Kingspan Kooltherm K108 Cavity Board - 1200mm x 450mm - All Thicknesses
From £85.74(Exc. VAT)Unit price /£0.00(Exc. VAT)
Buy Insulation Online with Fast UK Delivery
From DIY to Large-Scale Projects
Top Insulation Brands Delivered Nationwide
National Insulation Supplies offer an extensive selection of insulation products from leading manufacturers like Celotex, Kingspan, Knauf, Rockwool, and Recticel and much more.
Explore our diverse range of products tailored for various applications, including floor insulation, wall insulation, roof insulation and cavity wall insulation.
Our loft insulation options include a variety of premium products, such as loft roll designed to enhance energy efficiency in your building and even loft boards.
We also provide specialised products such as fire protection insulation, acoustic insulation, and eco-friendly solutions. Whether you need insulated plasterboard, building membranes, or fire-stopping insulation.
Popular by Category
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PIR Insulation
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Loft Insulation
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Acoustic Insulation
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Cavity Wall Insulation
- Knauf Dritherm 32 and 37
- Isover Cavity Wall Slab
- Celotex Thermaclass 21
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Insulated Plasterboard
2 months ago
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Excellent experience all round, competitive prices and a really good approach to customer satisfaction, they delivered within 4 days of placing the order and that was a day earlier than expected. I originally went with them because they don’t charge for delivery, (subject to a minimum order value), so even though they may not be the cheapest for the insulation boards they are still very competitive overall. The delivery driver was very helpful too, he dropped the pallet by forklift just where I wanted it! Top marks from me.
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2 months ago
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Prompt delivery, friendly driver, accommodating for where item to be stored, thank you
2 months ago
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A great product at a really good price it was only a small order but it was not a problem for this company neither was delivery a full day early fantastic we will definitely use them again thank you for a great price and service 😀
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2 months ago
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Goods nicely packaged and no nonsense delivery. Even though the delivery driver couldn't get an artic up our road he delivered the pallet with a forklift and placed it on our lawn.
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3 weeks ago
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Quick delivery quality products at a good price. Excellent delivery and top service assured
2 months ago
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Excellent! Brilliant prices, very prompt delivery, communication and support outstanding. Highly recommend.
2 months ago
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Decent prices and fast delivery. Recommended, and will use again.
a month ago
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Very good service. Quick delivery , highly recommend
3 months ago
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Purchased 30mm Recticel insulation for my garage door.
Worked great.
Insulation was delivered in good condition, Very happy.
3 weeks ago
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Excellent customer service, fast delivery and quality products
2 months ago
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Excellent experience all round, competitive prices and a really good approach to customer satisfaction, they delivered within 4 days of placing the order and that was a day earlier than expected. I originally went with them because they don’t charge for delivery, (subject to a minimum order value), so even though they may not be the cheapest for the insulation boards they are still very competitive overall. The delivery driver was very helpful too, he dropped the pallet by forklift just where I wanted it! Top marks from me.
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2 months ago
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Prompt delivery, friendly driver, accommodating for where item to be stored, thank you
2 months ago
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A great product at a really good price it was only a small order but it was not a problem for this company neither was delivery a full day early fantastic we will definitely use them again thank you for a great price and service 😀
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2 months ago
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Goods nicely packaged and no nonsense delivery. Even though the delivery driver couldn't get an artic up our road he delivered the pallet with a forklift and placed it on our lawn.
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3 weeks ago
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Quick delivery quality products at a good price. Excellent delivery and top service assured
2 months ago
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Excellent! Brilliant prices, very prompt delivery, communication and support outstanding. Highly recommend.
2 months ago
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Decent prices and fast delivery. Recommended, and will use again.
a month ago
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Very good service. Quick delivery , highly recommend
3 months ago
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Purchased 30mm Recticel insulation for my garage door.
Worked great.
Insulation was delivered in good condition, Very happy.
3 weeks ago
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Excellent customer service, fast delivery and quality products
5 months ago
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Really impressed with these guys! The new website is really easy to use and find exactly what you need. Spoke to Mitchell and he was friendly and a great help. Delivery was very quick. They're a really good bunch of people. Will definitely be using again.
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3 months ago
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Excellent service, from speaking to the sales people to see when my delivery was due to it been delivered. Highly recommended
3 months ago
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The insulation board from National Insulation Supplies is approx one third of the price of buying at diy stores. Was able to get it delivered even though it was a relatively small order (£168). Several suppliers have a minimum order for delivery much higher than that.
Delivery was prompt and driver helped me carry it down the drive to the garage. Happy customer, thanks.
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3 months ago
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Amazing service from the guys at NIS, ordered 36 8x4 sheets on Monday morning and delivered on Wednesday morning in the middle of December in a semi rural area. Helped make our new home warm for Christmas. Thank you all from the Fantom Menaces
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3 months ago
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Delivery was on time, and the driver was very helpful. All in all, a very good transaction wouldn't hesitate to use again
2 months ago
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These guys care supurb service from start to finish delivery was spoton didn't realize he couldn't get so the guy got it on the forks and brought it half a mile they deserve the five stars will use them again
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2 months ago
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Very happy with quality price and delivery timescale. Will be using again!
2 months ago
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Thanks again for the delivery. I also want to particularly thank the driver who went out of his way to deliver the insulation boards using his forklift, right to my door, despite the snow and icy conditions!
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3 months ago
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Goods received as ordered with no damage and on time, I would recommend this company.
5 months ago
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Really impressed with these guys! The new website is really easy to use and find exactly what you need. Spoke to Mitchell and he was friendly and a great help. Delivery was very quick. They're a really good bunch of people. Will definitely be using again.
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3 months ago
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Excellent service, from speaking to the sales people to see when my delivery was due to it been delivered. Highly recommended
3 months ago
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The insulation board from National Insulation Supplies is approx one third of the price of buying at diy stores. Was able to get it delivered even though it was a relatively small order (£168). Several suppliers have a minimum order for delivery much higher than that.
Delivery was prompt and driver helped me carry it down the drive to the garage. Happy customer, thanks.
Show more
3 months ago
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Amazing service from the guys at NIS, ordered 36 8x4 sheets on Monday morning and delivered on Wednesday morning in the middle of December in a semi rural area. Helped make our new home warm for Christmas. Thank you all from the Fantom Menaces
Show more
3 months ago
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Delivery was on time, and the driver was very helpful. All in all, a very good transaction wouldn't hesitate to use again
2 months ago
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These guys care supurb service from start to finish delivery was spoton didn't realize he couldn't get so the guy got it on the forks and brought it half a mile they deserve the five stars will use them again
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2 months ago
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Very happy with quality price and delivery timescale. Will be using again!
2 months ago
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Thanks again for the delivery. I also want to particularly thank the driver who went out of his way to deliver the insulation boards using his forklift, right to my door, despite the snow and icy conditions!
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3 months ago
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Goods received as ordered with no damage and on time, I would recommend this company.
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