Cavity wall insulation removal may be required for a number of reasons, including, but not limited to:
Why we do it:
- The building (or a particular wall) may not have been suitable for cavity wall insulation in the first place. For example a building with a high exposure to moisture, porous brickwork or mortar, steel-framed buildings would not be optimum for cavity wall insualtion.
- Incorrectly installed insulation: This could be through a badly located drill pattern or through not carrying out a fill test to determine fill rate, leading to voids within the cavity. Voids can cause cold spots within a wall expanse, leading to condensation and damp problems.
- Poor installation practices such as neglecting to take account of vents, designed to help the building breathe and stay dry.
- Damaged insulation material. Earlier chemical compositions of cavity insulation are not as effective at retaining their physical and chemical properties, thus they can be susceptible to breaking-down.
How we do it:
The process for removing Cavity Wall Insulation is as follows;
- Cut a brick out at the bottom of the property using an arbortech allsaw. This specialist tool allows us to save the original bricks so we can put them back in when we are done.
- Drill the existing insulation injection holes out but only using a 14mm hole not the standard 22mm. (Additional holes may be required above windows as this is a trap area for the insulation).
- An extra row, 3 bricks above the damp proof course (D.P.C) is also needed to ensure all cavity wall fill is pushed towards – and sucked out by – the hoover, ensuring no insulation remains above the D.P.C.
- Starting at the first hole, closest to the industrial Hoover (where the brick was removed), we use compressed air to force the insulation towards the hoover. This causes a gap in the insulation which allows the material to be sucked out. We then move a level above, to force the next section to the gap below and continue to repeat the process, forcing all the insulation downwards and out via our extraction hoover.
- The extracted material is bagged on-site and removed under a waste carriers license.
- The property is then checked with a boroscope to make sure the cavity wall insulation is removed. A specialist attachent can also be used to link the boroscope to an iphone. This allows us to take photos and videos of the inside of the cavity, which then allows our customers to properly inspect our work, and ensure all insulation is removed for themselves. These pictures and videos can be retained for you records.