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Knauf  |  SKU: 2404155-24

Knauf Loft Roll 44 Insulation - 150mm Combi-Cut (220.32m² ) - 24 Pack (1 Roll/Pack)

£687.50 Ex VAT
£825.00 Inc VAT

Get wholesale insulation prices with this bulk pack of Knauf Loft Roll 44 insulation (150mm) in a pack of 24 rolls.

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Our bulk packs of 24 rolls of Knauf loft insulation roll are ideal for large loft insulation projects. Designed for cold pitched roofs, these glass mineral wool insulation rolls are designed to be installed at ceiling level in layers, in order to reduce heat lost from the living areas via the loft. 

Each roll of “Combi Cut” insulation is pre-perforated to allow them to be separated into widths of either 2 x 570mm or 3 x 380mm.

  • 150mm thickness
  • Install over roof joists in combination with rolls installed between joists
  • Pre-cut to be separated in 2 x rolls at 570mm or 3 x rolls at 380mm
  • Euroclass A1 resistance to fire
  • Pack of 1 Roll

What is Loft Roll Insulation?

One of the most common variety of loft insulation is loft roll insulation. Often made from glass mineral wool or fibreglass, it is designed to prevent the loss of heat by trapping air within the fibres, and is installed between joists at ceiling level, i.e the “floor” of the loft. This prevents heat from within the living areas of the home from being lost via thermal bridging into the loft. 

What Size is Knauf Loft Roll Combi-Cut (150mm)?

Knauf Loft insulation roll consists of 1 roll of mineral wool with a total width of 1140mm. They are “combi-cut” which means that the roll is perforated along the length of the roll at various points to allow you to split it into either two rolls at 570mm wide, or three rolls at 380mm wide. Each roll measures 8050mm (8.05m) long, and can be cut to size using a sharp utility knife. Typically, when installing Loft Insulation, 100mm roll is used as the first initial layer laid between the joists, and thicker insulation is added on top to reach the minimum thickness required by building regulations (270mm/350mm in Scotland).

Knauf Loft Roll Insulation

Knauf Loft Insulation roll is a thermal insulation designed for use for insulating against heat loss through thermal bridging in lofts. It is made from a glass mineral wool, which is created by spinning molten glass into fibres, which are then compressed to create a soft and flexible wool-like batt or blanket. Being made from glass, it is a highly non-combustible material, achieving the highest “Euroclass A1” Resistance to Fire rating, and is bound with a patented ECOSE® binder which avoids added formaldehyde or phenol.

How to Use Knauf Loft Roll Insulation

Knauf Loft Roll 44 is designed to be easy to install within lofts to prevent loss of heat through loft spaces. It is placed at “ceiling level” within the loft (between and on-top of joists of the ceiling below) and is typically layered to take advantage of the space at loft level to achieve high levels of thermal insulation. Typically, a thinner thickness (100mm) is installed between the joists, and then thicker rolls are laid in a perpendicular direction on top of the joists to achieve an overall thickness that meets building regulations.

Loft roll 44 is “pre-cut” (perforated) in various places to allow it to be split into either two 570mm width rolls, or three 380mm width rolls. If neither of these widths suit the joist spacing, it is recommended to cut the entire roll to size with an insulation saw whilst still in the packaging.

Knauf Loft Roll is easily cut using a sharp utility knife. 

Read: How to Insulate and Board a Loft.

What Thickness of Knauf Loft Insulation Roll?

Building regulations dictate that loft insulation should be a minimum of 270mm (350mm in Scotland) which can be achieved even with just two layers of insulation. However, increasing the thickness of the loft insulation roll maximises the energy efficiency achieved through your loft insulation, so it is advised to make the insulation as thick as space and budget will allow, with new build properties tending to reach 400mm - 500mm depth. 

How to Calculate U Value

The U-value (thermal transmittance) of a building component such as a wall, roof, or window, measures its thermal conductivity or how easily heat can pass through it. The lower the U-value, the better the insulation. To calculate the U-value, you typically need to consider several factors, including the materials used, their thicknesses, and any air gaps. A general formula for calculating the U-value:

U = 1 over R

Where:

U = U Value

R = The total thermal resistance of the building component, including all layers of materials and air gaps.

Use the Knauf U Value Calculator.

Knauf Loft Roll Certifications

  • Complies to BS EN 13162
  • EUCEB Certified
  • manufactured in accordance with ISO 50001 Energy Management Systems, ISO 14001 Environmental Management Systems, ISO 45001 Occupational Health and Safety Management Systems and ISO 9001 Quality Management Systems. 

Data Sheets & Guides:

Knauf Loft Roll Data Sheet

Knauf Loft Roll Installation Guide

  • Size
    W: 1140mm (2 x 570mm/3 x 380mm) x L: 8050mm x T: 150mm
  • Quantity Per Pack
    1 Roll
  • Coverage (m²)
    220.32
  • Thickness
    150mm
  • Length
    8050mm
  • Width
    1140mm
  • Material
    Glass Mineral Wool
  • Estimated Lifespan
    Equivalent to lifetime of wall structure
  • Thermal Resistance
    3.40 m2K/W
  • Thermal Conductivity
    0.044 W/mK
  • Water Resistance
    5.00 MNs/g.m
  • Reaction to Fire
    Euroclass A1

Do You Ship to My Address?

We deliver to most mainland UK addresses. If you are in one of the areas listed below and are unable to checkout, please give us a call to put together a custom quote.

Northern Ireland (BT), Isle of Wight (PO30-37), Isle of Man (IM), Scottish Highlands and Orkney Isles (PA, ML, EH, KA, G, KY, PH, DD, AB, IV, KW), Outer Hebrides and the Shetland Isles (HS, ZE) will incur additional charges and may also experience delivery delays.

How Much Will My Delivery Cost?

You can work out the cost of delivery on your order before checkout by heading to our Delivery Info page.

How Long Will Delivery Take?

We aim to deliver your items in 3 - 5 Working Days unless otherwise specified (eg - Sheds and Paving Kits). After you have placed your order, we will process your order and book a delivery day - which will then be sent to you via Email.

If have a specific request, please do give our team a call on 01156976800 and we will do our best to help.

What If I Need to Return Something?

If for any reason you wish to return your purchase, we will offer a refund or an exchange as long as this is requested within 14 days of receiving your order.

A manufacturer’s restocking charge may also apply on certain products such as non-stock items, which may be up to 30% of the purchase price, and you will be notified of this amount when you request a refund or exchange.

For full information visit our Returns Policy.