Walltite CV100 Cavity Insulation
Airtight Cavity Wall Insulation
BASF WALLTITE cavity wall insulation is used to restore the structural stability and reduce the thermal transmittance of existing cavity walls, with masonry inner and outer levels, in which the conventional wall ties have corroded. It is also used in new construction where its superior thermal performance and resistance to flood water is of importance.
It has excellent resistance to driving rain and can be installed in all geographical exposure zones. BASF WALLTITE insulation is also ideal where the need to reduce air leakage is important. The foam completely seals the cavity and does not shrink and so air leakage through the cavity can be reduced to zero. WALTITE closed cell cavity wall insulation stabilises the wall by adhering to the inner surfaces of the cavity and providing a continuous structural connection between the two leaves. Because of the greater thermal performance and the reduced air leakage, WALLTITE outperforms all other forms of cavity fill. It is hypoallergenic and so contains no fibres, dust or obnoxious fumes. BASF WALLTITE foam injection insulation is installed by trained BASF Foam Master contractors and is NSAI and British Board of Agrément approved. To supplement this assurance BASF also offer a 10 year product guarantee. With a thermal conductivity of 0.025 W/mk WALLTITE achieves a U-value of 0.21 W/m2k over a 120mm cavity width as required by TGD 2011 Part L – Elemental U- values. Other U-value calculations can be provided by contacting the ECON technical team. WALLTITE cavity wall insulation then provides a airtight, watertight insulation layer coupled with the highest rate of heat resistance possible for cavity wall injection systems.
WALLTITE Injection Foam Application
The position and operation of any flues through or adjacent to the walls to be filled are noted.Gaps are filled in both the inner and outer leafs to prevent entry of foam insulation into the building. 12mm holes are drilled through mortar joints if possible following a specified drill pattern with holes typically drilled 650mm horizontally and 450mm vertically . The drill pattern is modified around windows, doors ventilators and eaves. When machinery operating conditions have been established the FoamMaster will produce samples for quality control purposes and will check for the required level of reactivity and cell structure. Injection of the WALLTITE liquid commences on a horizontal front ensuring that no holes are missed by placing indicator sticks in each injection point. The liquid foam slowly reacts within the cavity to form a closed cell, water resistant polyurethane insulation. The FOAMMASTER will work in “bands” around the building until from ground floor level upwards. Upon completion all drill holes will be made good to match the existing wall finish as closely as possible. A free cavity of 25mm should be available over the entire area to be filled. Cavities in excess of 100mm can be filled by modifying the drill pattern to bring the injection holes closer together.
WALLTITE Foam Insulation – Hard to Treat Cavity Walls.
Hard to treat cavities are defined as masonry cavities less than 50mm wide, radon stone cavities, buildings more than three stories high, and cavities in walls exposed to severe wind driven rain.
The most cost effective and least disruptive way to treat cavities of this kind is to inject insulation material directly into the existing cavity as accordance with the application guidelines outlined above
WALLTITE Foam Insulation – Partial Fill Cavity Walls.
Partial fill applications of WALLTITE closed cellfoam ordinarily involves the installation of insulating foam into “residual cavities”ranging in thicknesses from 25mm to 50mm. Existing insulation should be of a rigid board type (Polystyrene, Polyurethane).
The image provided to the right illustrates a 100mm total cavity with 60mm of rigid polyurethane insulation poorly fitted. In this instance WALLTITE has been injected into the remaining 40mm cavity filling all voids thereby creating an airtight, watertight insulation layer and so dramatically increasing the heat resistance value of the wall element.
New Build Cavity Wall Insulation
Following to the implementation of 2011 TGD Part L the call for wider cavities has increased in order to achieve lower regulatory U-values. WALLTITE cavity wall insulation has been installed in cavities as large as 200mm in thickness however it is more commonly installed in new build constructions ranging form 120mm to 150mm thereby achieving U-values of 0.21W/m2k and 0.17 W/m2K respectively. This then negates the need for supplemental insulation on the inner face of the inside leaf and so provides the building with the benefit of thermal mass along with airtightness and water resistance.
WALLTITE closed cell polyurethane insulating foam, has now received BBA certification for both insulation and stabilisation of masonry cavity walls. The certification recognises both the improved thermal insulation and structural stability that can be achieved by using this type of system.BASF WALLTITE closed cell foam is designed to be injected into cavity wall structures in both new build and refurbishment projects.
WALLTITE certification by BBA recognises WALLTITE as an airtight insulation system but also as a cavity wall stabilisation system for use in masonry cavity walls in which conventional wall ties have corroded. The product stabilises the wall by adhering to the inner surfaces of the cavity and providing a continuous structural connection between the two leaves