External Wall Insulation (EWI) Defects

External Wall Insulation (EWI) Defects2021-02-12T15:07:33+00:00

There is growing concern in industry external wall insulation (EWI) defects and consequently detachment of both heavy-weight rendered finishes and complete external wall insulation systems from high-rise multi-storey buildings are on the increase resulting in serious risk to life and injury to both building occupants and the general public from potential collapse of external wall insulation systems falling from tall buildings.

Fig1. External Wall Insulation (EWI)Cladding Collapse

External wall insulation (EWI) defects may include a combination of one or more of the following:

  1. Poor detailing of flashings to shed rainwater clear of the top of the external wall insulation system.
  2. Defective application of insulation boards, levelling, etc.
  3. Poor installation of weather seals around window and door openings and service penetrations through the external wall insulation system.
  4. Inadequate, missing or poorly designed or installed fire barriers.
  5. Premature breakdown of thin coat render finishes including wash-off.
  6. Unsightly dirt retention and increased algal growth on the finish render surface.
  7. Unacceptable cracking in render basecoat and finish.
  8. Insufficient application of basecoat render.
  9. Unacceptable vertical and horizontal cracking of render finish system.
  10. Diagonal cracking of render at corners of window and door reveals.
  11. Unacceptable render surface flatness variations and uneven surface appearance.
  12. Impact damage.
  13. Detachment of render finishes.
  14. Detachment of the complete external wall insulation system.

Fig2. External Wall Insulation (EWI)Render Detachment at Roofline

If your property is suffering from any of the above external wall insulation system defects and you require assistance please click here to contact us.