Nerang Roof Inspection Report Purpose:
Provide a roof condition report to AS 1562.1 AS 1562.3 And SA HB 39 2015 The Installation Code For Metal Roofing and Walling. Provide recommendations to extend longevity.
Inspection Site Gallery
Findings & Recommendations In Nerang Roof Inspection Report
- Change of pitch flashing is required if rusting of the sheeting is identified due to water entrapment. Replacement sheeting will be required.
- Corrosion at the base of the sheeting has been identified where the sheets meet the bull nose verandas. These should be changed as soon as practically possible to stop the spread of corrosion.
- Water ingress was due to the roof pitch being approximately 4- degrees which does not comply with the manufacturer’s instructions. This design of roof sheet requires a minimum pitch of 5- degrees as shown below.
- The roof pitch being less than 12.5 degrees is not compatible with having a valley installed and is non-compliant to SA HB 39 refer 5.4 see below. If not rectified this will lead to ingress.
- Evidence of roof valley overhang which has not achieved the 100mm of recommended coverage, non-compliant to SA HB 39 refer 5.4 (g) as shown.
- Corrosion has been identified to most of the ridge cap flashings where they have been scribed. These should be changed as soon as practically possible to stop the spread of corrosion.
- Ridge flashing joints are not undersealed and have insufficient fasteners, noncompliant to SA HB39 refer 8.2 and 5.8.3 as shown above. This will also reduce longevity as moisture from condensation gets trapped between the flashings leading to corrosion and future ingress.
- Roof cap flashing has an underlying obstruction in the area shown. The obstruction is severe enough to cause noticeable deformation to the flashing. It would be beneficial to have this issue rectified to increase longevity.
- Exposed copper piping will cause corrosion to the roof sheets, resulting from dissimilar metal water runoff. If not rectified this will lead to possible failure of the roofing materials, and could lead to ingress. Copper piping needs to be taped / covered to prevent corrosion from occurring. Pipe penetrations are heavily reliant on silicone, which has no longevity.
- Pipe penetrations are heavily reliant on silicone which has no longevity and breaks down under the sun’s UV rays, non-compliant to SA HB39 refer 8.6.1 as shown above. All penetrations must be fitted with a synthetic Dektite as per manufacturer’s instructions.
- Evidence of inadequate, non-professional installation of the roof skylight to the front of the main roof using silicone and spray paint, which has no longevity.
- Evidence of inadequate, non-professional installation of the solar panel vent. Joints are not undersealed and have insufficient fasteners, non-compliant to SA HB39 refer 8.2 and 5.8.3 as shown above. This will also reduce longevity as moisture from condensation gets trapped
between the flashings leading to corrosion and future ingress.
- The installation of the roof sheets is not satisfactory, roof sheets have end lapped. This will reduce longevity as moisture from condensation gets trapped between the sheets leading to corrosion.
- Evidence of inadequate, non-professional roofing installation of the aerial and small solar panels penetrations. These are heavily reliant on silicone which have no longevity and breaks down under the sun’s UV rays, non-compliant to SA HB39 refer 8.6.1 as shown in #6. All penetrations must be fitted with an individual synthetic Dektite as per manufacturer’s instructions.
- Anti-capillary features to sheet lap have been compromised using silicone, this is likely to trap in water and lead to ingress. Non-compliant to AS 1562.1 refer appendix D. Installing a tray flashing with the Dektite in a diamond formation on top will allow total drainage of the area and extend the longevity.
- Incomplete work, evidence of old flashing still in place.
- Evidence of minor foot traffic damage to the main roof, non-compliant to SA HB39 refer B6.5.1 as shown.
Manufacturer’s Instructions: Bluescope Roof Pitch
Pitch Transition Flashing
The addition of extensions to existing dwellings can often lead to incorrect flashing procedures which may direct water and condensation products into roof cavities and lead to consequent damage of interior fixings. In all instances where a change of pitch occurs which may be at an extension or verandah addition to either a sheet or tiled roof residence, the appropriate change of pitch flashing should be chosen to correctly flash the join, as shown in Figure 3.
Under no circumstances should the overlapping sheet be simply fastened firmly down onto the underlying sheet, in the absence of a transition flashing, in an attempt to waterproof the transition joint. Thermally induced stresses will lead to coating removal of the underlying sheet at the point of contact and the onset of rapid corrosion due to the loss of sacrificial metallic coating.
Often dirt is blown into the overlapping roof structure and retained in the upturned decking trays in the absence of correctly fitted transition flashings. The dirt will retain moisture originating from condensation and wind driven rain which quickly leads to perforation of the extension roof decking and penetration of water to the ceiling cavity below.
Nerang Roof Inspection Conclusion
There is evidence of inadequate, non-professional roofing installation and noncompliance issues as noted in this report, and it would be beneficial to rectify these to ensure the roof is compliant and increase longevity.