Internal and External Walls
Both internal and external timberframe walls can be insulated with cellulose fibre. Typically we use ‘dry injection’ to insulate a wall closed with plasterboard, plywood, OSB or a flexible membrane. Holes are cut to allow insulation to be blown into each cavity. Once insulated, holes are patched.
If required, we can use a damp-spray method to insulate an open wall. Cellulose fibre is blown though a fine mist of water allowing it to adhere to the inside surfaces of the wall. Excess is scraped off and plasterboard can then be tacked to the studs.
Can I use cellulose in a brick-and-block cavity wall?
Putting cellulose fibre betwen two masonry walls creates a high risk of condensation. Damp can collect in cavities on the inner face of the brickwork. Although cellulose can safely take up and lose high humidity levels, it should not get soaking wet. So it should not be used in this situation.