Alreflex 1L1

Alreflex 1L1 is a versatile insulation that has been used by some of the largest house builders in the UK for the past 25 years in various applications. Initially used as cavity wall insulation, it is now predominantly used as a dry lining providing the dual function of enhancing the U-value and reducing air permeability. As a completely flexible and waterproof product Alreflex 1L1 is also used in difficult detailing work and curved structures, where it is not possible to use rigid conventional insulations.

With a BRE Green Guide A+ rating Alreflex 1L1 has excellent environmental credentials. It has a Global Warming Potential of zero and an Ozone Depletion Potential of Zero. No CFCs, HFCs or HCFCs are used in the production of Alreflex 1L1.

Installation Guides

Alreflex 1L1 Cavity Wall

Technical Data Sheets

Alreflex 1L1

Safety Data Sheets

Product Specifications

Roll Size 1.05m x 50m, 1.2m x 50m & 1.5m x 50m
Thickness  3mm
Foil emissivity 0.03
Surface spread of flame  Class O
Resistance of (min) 20mm residual cavity  0.71m2∙K/W
Resistance of bubble/foil  0.10m2∙K/W
Global Warming Potential  Less than 5
Ozone Depletion Potential  Zero 
BBA Certified Product

BBA Certified Product

Built in Vapour Barrier

Built in Vapour Barrier

Cavity Rainwater Barrier

Cavity Rainwater Barrier

Cost-effective Solution

Cost-effective Solution

Easy Installation

Easy Installation

Global Warming Potential less than 5

Global Warming Potential less than 5

Improves Air Tightness

Improves Air Tightness

Ozone Depletion Potential Zero

Ozone Depletion Potential Zero

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Main Applicaitons

Cavity Insulation

Alreflex 1L1 can be used in cavity wall construction to achieve a U-value of 0.45W/m2K. This is a low-cost solution to provide a reasonable level of insulation where building regulations are not required or are not applicable.

Dry Lining

Alreflex 1L1 can be used as a dry lining to lower U-values, reduce air permeability and lower thermal mass in new-build and refurbishment applications.

Alrelfex 1L1 can be used to provide a thin, incredibly cost effective insulation for existing dwellings. In a standard 225mm solid brick construction the addition of Alreflex 1L1 dry lining will improve the U-value of the structure by 59%. In new build constructions it can be used in addition to a cavity wall insulation to lower U-values or reduce the overall thickness of the construction.

Detailing Work

Alreflex 1L1 is only 3mm thick and is extremely flexible, this makes it the ideal solution for preventing cold bridging in difficult detailing areas and in reduced cavity widths. It is regularly used around steel columns, windows and doors, slab edges and wind posts in this type of application to improve Psi values for Part L compliance.