Insulation U Value, R Value and K Value explained
Insulation terms like U Value, R Value and K Value can be a little overwhelming when you start to try and research what is best for your needs.
This is particularly the case when you are not working to set specifications as would be found in a new build project or a major extension or renovation. These terms can seem technical and confusing so our helpful guide will try and make this all a bit more straight forward for you.
What does Insulation U Value mean?
The Insulation U Value (or Thermal Transmittance value) is the rate at which heat is lost through a given thickness of a part of a building such as the wall, roof or floor.
You want the U Value of any material to be low and ideally any material to gain a small bit of heat over a given period. The unit of measurement used for this is W/m²K (Watts per square metre – Kelvin).
Although a material will have a U Value, when considering the overall U Value of a building then you must consider the R Value of all materials used.
What does Insulation R value mean?
The Insulation R Value is used to judge how a material can resist heat transfer at any given thickness. Since you are ideally looking for materials that can resist heat transfer effectively you should choose materials that have a high R value. The R Value refers to the material itself and it’s thickness.
What does Insulation K value mean?
The Insulation K Value (or Thermal Conductivity value) is the ability of any given material to conduct heat. Heat energy does not pass as effectively through materials with low thermal conductivity so ordinarily you should be looking for low K values when dealing with insulation.
If you need any assistance in choosing the right type of insulation for your needs just contact us and our friendly team will help in every way needed.
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Shop optionsSpaceloft Aerogel Strip Insulation for Posts, Windows & Doors
€18.33 – €27.15 (Inc. VAT)Spaceloft Aerogel Strip Insulation for Posts, Windows & Doors
Insulate Steel Posts, Door Frames and Window Frames with Spaceloft Aerogel Strips
Key features:
- For insulation of steel posts
- Ideal for use in frames in Bay Windows
- Also used to insulate Door Frames
- Eliminates Cold Bridge and prevents mould
€18.33 – €27.15 (Inc. VAT) -
Knauf Earthwool Insulation – Loftroll 44 (100mm x 13.9m2)
Knauf Earthwool 44 100mm Loft Roll Insulation
Key features:
- Used on pitched roofs at ceiling level
- Trusted brand
- Thermal Conductivity is 0.044 W/mK and the R Value is 2.25 M2K/W
- Easy to install and handle on site
Bulk Discounts: Buy 10-20 rolls save 2% / More than 20 rolls save 3%
€52.25 (Inc. VAT) -
Unilin Xtrowall Plus Cavity Wall Insulation PIR 110mm
Xtrowall Plus PIR Cavity Wall Insulation 110mm
Key features:
- High quality PIR Cavity Wall Insulation
- Trusted brand
- 110mm thick and 2.16 sqm coverage
- Ideal for Trades people and for DIY
- Unilin was previously Xtratherm
€63.12 (Inc. VAT) -
PIR Insulation Unilin Full Fill Cavity Wall Insulation 100mm
Unilin (previously Xtratherm) CavityTherm PIR Full Fill Cavity Insulation (CT/PIR) 100mm
Key features:
- High performance
- Trusted brand
- 100mm thick and 2.16 sqm coverage per pack
- Ideal for Trades people and for DIY
- Unilin was previously known as Xtratherm
€54.75 (Inc. VAT) -
Isover Acoustic Insulation Roll
Acoustic Insulation Roll
Key features:
- A mineral wool roll providing high levels of acoustic insulation
- Suitable for use in partitions, walls and floors
- Used to meet acoustic requirements in domestic and non-residential applications.
- Various thicknesses available
€87.05 – €105.71 (Inc. VAT) -
Shop optionsRockwool Roll Thermal insulation for Lofts & Acoustic Insulation For Suspended Ceilings
€62.34 – €74.55 (Inc. VAT)Rockwool Roll Thermal insulation for Lofts & Acoustic Insulation For Suspended Ceilings
Rockwool Thermal and Acoustic Insulation Roll
Key features:
- High quality insulation for lofts
- Also Acoustic Insulation for suspended ceilings
- Excellent thermal insulation
- Easy to fit and work with
€62.34 – €74.55 (Inc. VAT) -
Unilin Insulation Strip
Thin-R PIR Insulation Strips Unilin (previously Xtratherm) XT/UF
Key features:
- Helps to achieve good detailing at join of wall and floor
- Reduces Thermal Bridging
- Easy to use
- Ideal for Trades people and for DIY
- Unilin was previously Xtratherm
€261.86 – €262.78 (Inc. VAT) -
Shop optionsUnilin Floor Insulation Boards / Pitched Roof Insulation boards 2.88m2
€28.40 – €73.65 (Inc. VAT)Unilin Floor Insulation Boards / Pitched Roof Insulation boards 2.88m2
Thin-R PIR Insulation Boards for Floors and Pitched Roofs (XT/UF)
Key features:
- High performance floor insulation
- Can be used with new and existing floors
- Suitable for use with underfloor heating
- Also suitable for use in pitched roofs
- High moisture resistance
- 2.4 metres x 1.2 metres (8 feet x 4 feet)
- This is from Unilin – previously known as Xtratherm
€28.40 – €73.65 (Inc. VAT) -
Metac Isover Acoustic & Thermal Insulation Roll
ISOVER Metac Insulation Roll W/mK 0.034
Key features:
- High performance and high quality thermal insulation roll
- Excellent acoustic performance
- Suitable for use in multiple locations
- A1 Fire Rating
Bulk Discounts: Buy 10-20 rolls save 2% / More than 20 rolls save 3%
€62.32 – €139.00 (Inc. VAT) -
Rockwool Flexi Insulation (Acoustic & Thermal) Mineral Wool
Rockwool Flexi Slab Acoustic and Thermal mineral wool insulation
Key features:
- Dual Acoustic and Thermal insulation
- Unique flexible edge along one side for the perfect fit
- A1 Fire Resistant
- Supplied per bale
€56.90 – €77.25 (Inc. VAT) -
Superfoil Double Foil Bubble Insulation SFBA MP 7mx1m
SuperFoil SFBA MP Double Foil Bubble Insulation 4mm
Key features:
- Foil Insulation for the roof, walls and floors
- Suitable for new builds and retro fitting
- Water & Vapour resistant
- Ideal for Trades people and for DIY
€36.75 (Inc. VAT) -
Foil Tape – Reflective from Superfoil (20m x 100mm)
Superfoil Reflective Foil Tape
Key features:
- For securing, joining and sealing foil insulation products
- High quality reflective foil tape
- Helps provide maximum thermal performance and durability
- Creates strong seal – helping to eliminate cold spots and draughts
- Strong, long lasting hold
- 20m x 100mm
€6.85 (Inc. VAT) -
SOUDAFOAM Airtight Acoustic & Thermal Insulation Foam For Windows & Doors
Airtight acoustic and thermal insulation foam
Key features:
- Flexible, Airtight Expanding Foam Filler
- Airtight
- Excellent stability (no shrinkage or post expansion)
- High insulation value, thermal and acoustic
- 750ml
€13.95 (Inc. VAT) -
Sheep Wool Insulation
Pure & natural Sheep Wool Insulation
Key features:
- 100% pure, natural, breathable and environmentally friendly material for insulating attics, ceilings, roofs, walls and floors
- High performance of thermal insulation with Thermal Conductivity between 0.0359 and 0.042 W/mK
- Used in all types of commercial and residential buildings along with campervans and sheds
- Can absorb up to 33 % of its own weight in moisture, without losing any of its insulating properties
- Nothing added at all – just 100% pure natural wool
€104.19 – €189.80 (Inc. VAT) -
Rockwool Attic Insulation – Thermal Roll 6.6m2
Rockwool Thermal Roll Loft & Attic insulation
Key features:
- High quality insulation roll for attics and lofts
- Makes any home more comfortable while reducing energy bills
- Non-combustible material and can withstand temperatures in excess of 1000˚C
- Also has acoustic performance qualities, absorbing sound and reducing vibrations
- 100mm thick x 1200mm with total coverage per roll of 6.6m2
€79.98 (Inc. VAT) -
Loft Legs 12 Per Box 600mm Centres
Loft Legs for 600mm centres between joists
Key features:
- Raises loft floor to prevent compression of insulation
- Means you can place additional insulation underneath
- Save money on fuel and energy
- Ideal for Trades people and for DIY
€19.15 (Inc. VAT) -
Loft Lid Downlight Cover
Loft Lid Fire Retardant Downlight Cover
Key features:
- Fire retardant downlight cover for safe, energy efficient installation of downlights in the loft.
- Creates a safe, airtight cover over downlights in a loft
- Reduces heat loss and drafts through ceiling
- Reduces the risk of downlights overheating
- Complies with current building regulations and tested to all relevant British Standards
€8.50 (Inc. VAT) -
Cavity Closer Unilin Close-R Insulation
Unilin (previously Xtratherm) Cavity Closer Insulation
Key features:
- A cost effective solution for builders and specifiers for the closing of cavities around window and door openings
- For preventing cold bridging, damp penetration, air infiltration and condensation
- Range of sizes available
- Suited to all types of windows and doors and is available in sizes to fit cavity widths from 100mm – 150mm
- Unilin was previously Xtratherm
€13.64 – €21.60 (Inc. VAT) -
Insulated Loft Decking Boards 14.4m2 – Unilin Thin R (XT/Walk-R)
Unilin (previously Xtratherm) Thin R XT/Walk-R Insulated Loft Boards
Key features:
- High performance foil faced 75mm PIR Insulation on tough 11mm OSB Boards
- Perfect for attic and loft insulation
- Maintains very high insulation values
- Sold per bale with 14.4m2 coverage per bale
- Ideal for Trades people and for DIY
- Unilin was previously known as Xtratherm
€498.97 (Inc. VAT) -
PHS Loft Stairs Hood
Passive House System Loft Stairs Hood
Key features:
- PHS Attic Stair Cover is an easy solution to insulate attic stairs while maintaining easy access to your attic.
- Airtight – Eliminates draughts through your attic stairs
- Insulating – prevents heat escaping through the loft
- Flexible & lightweight
- Simple to install
- Two heavy duty zips
- Highly durable, insulated and double radiant fabric
€72.95 (Inc. VAT) -
Unilin Cavity Wall Insulation Tongue & Groove 60mm
Unilin (previously Xtratherm) Cavity XT/CW (T&G) PIR Insulation 60mm
Key features:
- High quality T&G PIR Insulation
- Trusted brand
- 60mm thick and 3.78 sqm coverage.
- Ideal for Trades people and for DIY
- Unilin was previously known as Xtratherm
€76.80 (Inc. VAT) -
Knauf Earthwool Insulation Loftroll 44 (150mm x 9.18m2)
Knauf Earthwool 44 150mm Loftroll Insulation
Key features:
- Used to insulate pitched roofs at ceiling level
- Excellent thermal performance
- Non-combustible A1 Euroclass Reaction to Fire classification
- Easy to move around site
- Thermal Conductivity is 0.044 W/mK and the R Value is 3.40 M2K/W
Bulk Discounts: Buy 10-20 rolls save 2% / More than 20 rolls save 3%
€52.25 (Inc. VAT) -
Knauf Earthwool Insulation Loftroll 44 (200mm x 6.84m2)
Knauf Earthwool 44 Loftroll Insulation 200mm thickness
Key features:
- Used for insulating pitched roofs at ceiling level
- Easy to install and trusted brand
- Thermal conductivity of 0.044 W/mK and R Value of 4.50 M2K/W.
- Non-combustible A1 Euroclass Reaction to Fire classification
Bulk Discounts: Buy 10-20 rolls save 2% / More than 20 rolls save 3%
€53.25 (Inc. VAT) -
Economiser Hot Water Cylinder Insulating Jacket 36×18
Water Cylinder Insulating Jacket 900mm x 450mm
Key features:
- Insulate your hot water cylinder
- Save money and energy by minimising heat loss
- Includes fixing straps
- Fire retardant
€26.26 (Inc. VAT)
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