Polystyrene block – sealant failure in panel joints
Listed under: Exterior, adhesives and sealants, sealants, plastic, polystyrene, cladding, walls, moisture, leaks, wall cladding, polystyrene blocks
Cause
UV exposure
Repair
- fully remove all sealant from the joint, insert backing rod or bond breaker tape and apply and tool off new sealant suitable for the in use environment
- obtain advice on correct sealant for the material and joint size
- use a paintable sealant if the wall is to be painted
- where it is suspected that the building may be leaking and there is a risk of damage, engage a building surveyor to investigate and report
Cause
Sealant not suitable for being painted
Repair
- fully remove all sealant from the joint, insert backing rod or bond breaker tape and apply and tool off new sealant suitable for the in use environment
- obtain advice on correct sealant for the material and joint size
- use a paintable sealant if the wall is to be painted
- where it is suspected that the building may be leaking and there is a risk of damage, engage a building surveyor to investigate and report
Cause
Too much movement for the grade of sealant
Repair
- fully remove all sealant from the joint, insert backing rod or bond breaker tape and apply and tool off new sealant suitable for the in use environment
- obtain advice on correct sealant for the material and joint size
- use a paintable sealant if the wall is to be painted
- where it is suspected that the building may be leaking and there is a risk of damage, engage a building surveyor to investigate and report
Cause
Sealant not installed over a backing rod or bond breaker tape
Repair
- fully remove all sealant from the joint, insert backing rod or bond breaker tape and apply and tool off new sealant suitable for the in use environment
- obtain advice on correct sealant for the material and joint size
- use a paintable sealant if the wall is to be painted
- where it is suspected that the building may be leaking and there is a risk of damage, engage a building surveyor to investigate and report
Cause
Sealant at end of serviceable life
Repair
- fully remove all sealant from the joint, insert backing rod or bond breaker tape and apply and tool off new sealant suitable for the in use environment
- obtain advice on correct sealant for the material and joint size
- use a paintable sealant if the wall is to be painted
- where it is suspected that the building may be leaking and there is a risk of damage, engage a building surveyor to investigate and report