Case 2
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Remedial
Where blistering is caused by water vapour, and is confined, install vapour vents so as to release the water vapour pressure underneath the roof coverings. However, these will have a limited effect where the first layer is bonded to the roof deck.
Repairing Blisters
If blistering occur throughout the roof surface area, it is advisable to relay the membrane. Begin patching a blister by first cutting across its face with a sharp utility knife. Once the blister has been opened, check the inside to make sure that there is no water present. If water is present, make sure the area must be dried, either by leaving the blister open and letting the sun dry the area or by using a portable hair dryer.
When the area is completely dry, mineral fiberglass placed. Next, press the cut edges of the blister down and reapply the liquid-applied membrane. Some professional roofers will also give the edges of the patch an additional coat of the membrane. However, if extensive blistering happen throughout the whole areas of the roof, re-roofing will be more appropriate.