Wall Insulation |

Wall Insulation

Cavity wall insulation
External wall insulation
Insulated plasterboards
Internal wall insulation
Partition wall insulation

The benefits of properly sealed, moisture-protected, and insulated walls are:

increased comfort
reduced noise
reduced energy cost
reduced CO2 emissions

Wall Insulation requirements

In order to achieve most effective results when installing wall insulation a number of key factors must be taken into consideration:

Airtight constructionall air leaks should be sealed in the wall during construction and prior to insulation installation.
Moisture controlexterior rain drainage system, continuous air barrier, and vapour barrier should be located on the appropriate side of the wall
Complete insulation coverageadvanced framing should be used to maximize insulation coverage and reduce thermal bridging, no gaps or compressed insulation, and continuous insulated sheathing.

Air sealing

Air sealing reduces heat flow from air movement (convection) and prevents water vapour in the air from entering the wall. In a 100-squarefoot wall, one cup of water can diffuse through drywall without a vapour barrier in a year, but 50 cups can enter through a -inch, round hole. In fact, sealing air leaks is 10 to 100 times as important as installing a vapour barrier. Air sealing and moisture control make insulation more effective. Vapour barriers only retard moisture due to diffusion, while most moisture enters walls either through fluid capillary action or as water vapour through air leaks.

Causes of rain leaks through exterior walls include improper installation of siding materials; poor-quality flashing, weather-stripping, or caulking around joints in the building exterior (such as windows, doors, and bottom plates); and wind-driven rain that penetrates the exterior finish. To enhance protection against rain penetration, a drainage plane should be created within the wall system of the home.

U-value

The effectiveness of an insulating material is measured using a 'U-value'. A U-value is a measure of how much heat is conducted through a structure. Correctly installed insulation will have a low U-value as it will allow only small amounts of heat to pass through, thereby keeping your home warmer for longer.

Building regulations require insulated walls to achieve U-value of 0.27 W/m K or better (i.e. Lower).

Wall and Insulation Types

The first step in getting wall insulation is establishing the wall type of your home. The three main wall types are:

cavity walls
solid walls
hollow block walls

A building contractor or architect will be able to tell you what type of wall your home has.Depending on the wall specification three types of wall insulation can be used:

Cavity wall insulation
Internal Insulation
External insulation

Wall Insulation Application Types

Full fill cavity

Used in cavity walls.

No need for a residual cavity.
Suitable for mineral wool and some expanded polystyrene insulants.
Insulation thickness varies according to the U-value requirement.
Wall tie or suitable fixing is essential.
Foil faced insulants are not suitable for this application.
Suitable for natural insulation materials when used with a barrier

Partial fill cavity

Used where residual cavity is needed to avoid risk of rain penetration.

Residual cavity must be a minimum of 50mm.
Suitable for all insulants.
Thinner, foil faced insulation boards take advantage of reduction in heat radiance across the cavity and reach required U-value.
Any problems associated with complete cavity fill can be avoided.
Suitable for natural insulation materials when used with a barrier

Internal Wall Insulation (Thermal Laminates)

Used in homes built with solid wall or hollow block construction method.

Combination of insulation already bonded to plasterboard.
Simple to fit - just fix against internal leaf of wall.
Wide range of insulation materials available to meet every need.
Suitable for refurbishment

External Wall Insulation

Used in solid walls that suffer from poor airtightness.

Ideally suited to refurbishment products.
Wide range of products offered for this application.
Suitable for natural insulation materials when used with a barrier

Choose subcategory or scroll down to see products

Cavity Wall Insulation

Insulated Plasterboards

Internal Wall Insulation

Partition Wall Insulation

Internal Wall I-Clad Brick Slip System

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25mm Celotex CW4000 Rigid PIR Cavity Insulation Board (pack of 20)

1200x450mm - 10.8m2 show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £72.19 (£86.63 inc VAT)

£6.68/m² (£8.02/m² inc VAT)

show quantity discounts

Due to nationwide shortage of PIR insulation lead time may be longer for this product.

25mm Celotex CW4000 is an insulation board aimed specifically at partial fill cavity wall applications. It comprises a polyisocyanurate rigid foam insulation core, with a thermal conductivity of 0.022 W/mK and low emissivity aluminium foil facings on both sides. CW4000 is manufactured from rigi..