Masonry cavity walls in existing or new constructions can be surely filled with blown in glass mineral wool fibres, polystyrene beads or polyurethane foam. While all material have their advantages, glass mineral wool fibre is one of the most popular still among users and builders of homes. One imagine may be that the insulation material is a non petroleum byproduct and therefore more eco friendly.
The popular construction recipe with dual walls in the envelope is wide spread in the dwellings in the northern hemisphere. Ironically most existing structure are devoid of any insulation except for the air gap. Where ever there is insulation, the cheap material could have placed down losing it's efficacy or else perished due to moisture and vermin. With the skyrocketed power prices you would have been paying unnecessarily for your home heating all these years unknowingly due to this. With the Eu directives for power rating of homes such as Ber theory of Ireland it has now become significant to have retrofitted (or new) cavity wall insulation in existing and new houses.
While cavity wall insulation can be applied in slabs or batts with excellent door and window seals, none is convenient and time recovery as the blown-in insulation.
Equipment used and method
The cavity wall insulation of glass mineral fibre is fed into a purpose made blowing engine and injected in to the cavity under high air pressure straight through a flexible hose fitted with a tapered nozzle. Evenly distributed holes of size 22mm to 25mm dia will be drilled straight through the outer wall first to gauge the health and properties of the existing insulation (in a retrofit).These same holes will be subsequently used for the new insulation fill.
A built in pressure transducer will sense the density and compactness of the fill to the desired settings and cut off the flow of insulation fibre and the pressurized air flow accordingly.
An foremost requirement is to carry out a seek before all else and to decide the Insulation status (if any), position of flues, air vents, etc. significant ventilation inlet/outlets such as those providing combustion oxygen or under floor ventilation, and all flues that run in the cavity wall, need to be checked and sleeves provided or else redesigned to preclude obstruction by the insulation being blown in.
An popular ,favorite cavity barricade is inserted as significant to isolate terraced or semi-detached properties and also to close all open cavities. A pattern of 22 or 25mm diameter holes are drilled in accordance with the popular ,favorite code of institution as mentioned earlier.
In new constructions, holes are commonly drilled straight through the inner leaf (wall) to the cavity and the insulation blown in, prior to plastering. In existing buildings, holes are commonly drilled straight through the mortar joints in the external leaf and are made good with mortar and concluded to match the existing finish.
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