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Celotex Thermaclass Cavity Wall 21 for internal/external walls -
Celotex Thermaclass Cavity Wall 21 - 115mm thick -
Celotex Thermaclass Cavity Wall 21 - 140mm thick
Celotex Thermaclass Cavity Wall 21 (90mm-140mm)
Premium quality Polyisocyanurate Insulation Board
Product Code: CTX-TCW21Estimated delivery in 3-5 working days
Free delivery for orders over £350.00
ADDITIONAL INFORMATION
• Brand
Genuine Celotex Thermaclass Cavity Wall 21
• Length
450mm
• Width
1200mm
• Thickness
90mm - 140mm
• Material
Polyisocyanurate (PIR) insulation board
• Edge Profile
Tongue and groove
• R-Value
90mm: 4.25 m² K/W
115mm: 5.45 m² K/W
140 mm: 6.65 m² K/W
• Thermal Conductivity
0.021 W/mK
• Facing
Low emissivity foil facing
Significantly enhance the energy efficiency of your building by reducing heat loss in winter and heat gain in summer.
• Thermal Properties
Thermal conductivity for excellent insulation capabilities that helps to minimise heat loss during winter and heat gain during summer.
The board's low emissivity foil facing enhances its thermal performance by reflecting radiant heat back into the building, further improving energy efficiency.
• Connection Profile
The engineered Tongue & Groove edges maximise thermal performance, resist water penetration, and eliminate the need for taping joints.
• Easy to Install
Lightweight and rigid boards are convenient to handle and fit into cavity walls.
• Environmentally Friendly
Manufactured with a blowing agent that has zero ozone depletion potential (ODP) and a low global warming potential (GWP), making it an environmentally responsible choice.
• BBA Certified
BBA approved (Certificate 16/5343) for full fill cavity walls. Assessed by the British Board of Agreement (BBA), ensuring its certification is suitability for use in defined full-fill cavity wall applications.
• Fire Classification
Euroclass F (Reaction to Fire classification according to BS EN 13501-1)
What is cavity insulation?
Cavity wall insulation is a method used to improve the thermal efficiency of a building by filling the gap (or "cavity") between the inner and outer walls. Homes built after the 1920s often have two layers of brick or blockwork with a gap between them, and filling this space with insulating material can prevent heat from escaping, reducing energy bills and keeping the home warmer.
Is it a good idea to have cavity wall insulation?
Yes, cavity wall insulation is generally a good idea as it can significantly improve a home's energy efficiency. By filling the gap between the inner and outer walls, it reduces heat loss, which helps to lower energy bills and keep your home warmer in winter and cooler in summer. It also reduces your carbon footprint by cutting down on energy consumption.
However, it is important to ensure that your home is suitable for cavity wall insulation. Homes that are prone to damp or have damaged walls may not benefit as much and could experience issues if moisture gets trapped in the walls. A professional survey is recommended before installation.
How often should cavity wall insulation be replaced?
Newer cavity wall insulation typically doesn't need to be replaced once it's installed, as most types are designed to last the lifetime of the building (around 25-40 years or more). However, factors such as damage or degration, incorrect installation, outdated materials, or energy efficient upgrades suggest it to be inspected every 10-15 years.
What is the difference between loft insulation and cavity wall insulation?
Loft insulation is placed in the roof space to prevent heat from escaping through the ceiling, while cavity wall insulation is installed between the inner and outer walls of a building to reduce heat loss through the walls.