Thornlands Roof Inspection Report Purpose:
Provide a roof condition report to N.C.C 2016 Vol.2, AS 1562.1, AS 1562.3, SA HB 39 2015: The installation Code for Metal Roofing and Walling and Manufacturer’s Instructions. Provide recommendations to extend longevity.
Findings & Recommendations In Thornlands Roof Condition Report
- Ridge capping joints are not undersealed and have insufficient fasteners, non-compliant to SA HB39 refer 8.2 and 5.8.3 as shown.This will also reduce longevity as moisture from condensation gets trapped between the flashings leading to corrosion and future ingress. Also, evidence of corroded fasteners. These should be removed as soon as practically possible to prevent the spread of corrosion to the roofing materials.
- Evidence of previous repair using silicone, which has no longevity and breaks down under the sun’s UV rays and a split is present, this is likely to trap in water and lead to ingress. Also risk of aerial cables being cut by ridge cap flashing. By rectifying these issues this will stop future ingress and will increase longevity.
- Skylight frame has reached the end of its serviceable life span. Deterioration is evident; skylight frames require replacement to prevent the spread of more corrosion. If not rectified will lead to ingress. Roof sheets have been double lapped and end lapped. This will reduce longevity as moisture from condensation gets trapped between the sheets leading to corrosion. Also evidence of previous repairs using silicone which has no longevity. If not rectified this will lead to ingress.
- Evidence of previous repairs using silicone which has no longevity and breaks down under the sun’s UV rays, this is likely to trap in water and lead to corrosion and future ingress.
- Evidence of Polycarp roof sheets showing signs of deterioration, also evidence of original fastener holes without fasteners. By rectifying these issues this will stop future ingress and will increase longevity.
- Evidence of rotten timber cladding with gaps present. By rectifying this issue this will stop future ingress and will increase longevity.
- Evidence of apron flashing coming away from the wall exposing a gap due to loose fixings, if not rectified this will lead to ingress. Installing a pressure flashing shown below will ensure longevity and make it compliant.
- Evidence of fastener which has been installed into the pan of the sheet, this does not comply with the manufacturer’s instructions. By rectifying this issue this will stop future ingress and will increase longevity.
- Evidence of double lapped sheet, non-compliant with manufacturer’s instructions. Double lapped sheets rapidly corrode due to moisture being trapped between the two.
- Ridge and barge capping 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.
- Evidence of internal battens spans (1350mm) on the back side of the roof which does comply with the manufacturer’s instructions as the pitch of the roof is less than 10 degrees, as shown below. Evidence of insufficient screw pattern across the roof, non-compliant to manufacturer’s instructions, as shown below. Non-compliant to SA HB39 refer 7.2 as shown.
- Fasteners across the whole of the roofs have reached the end of their serviceable life span, fasteners are heavily corroded and require replacement to prevent the spread of corrosion. Non-compliant to SA HB39 refer 4.4.2 as shown. By rectifying these issues this will stop future ingress and will increase longevity.
- Roof sheet and fasteners across the whole of the roof have reached the end of their serviceable life span, fasteners are heavily corroded and require replacement to prevent the spread of corrosion. Non-compliant to SA HB39 refer 4.4.2 as shown. By rectifying these issues this will stop future ingress and will increase longevity.
- Existing downpipe spreaders non- compliant to SA HB39 refer to 5.7.7 as shown. Spreaders to discharge all rainwater onto all roof coverings in the direction of flow. Also, no half end caps have been provided.
- Apron joint is not undersealed and has 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.By rectifying these issues this will stop future ingress and will increase longevity.
- Evidence of internal battens spans (1200mm) on the back side of the roof which does comply with the manufacturer’s instructions as the pitch of the roof is less than 10 degrees, as shown above. Evidence of insufficient screw pattern across the roof, non-compliant to manufacturer’s instructions, as shown below. Non-compliant to SA HB39 refer 7.2 as shown above.
- Evidence that the roof flashings have been reused due to the original holes being present. Also, flashing capping 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.
- Ridge capping 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.
- Evidence of insufficient fasteners to barge caps, if not rectified these may blow off in heavy wind conditions.
Conculsion Outlined In Thornlands Roof Condition Report
There are many issues highlighted in this report, caused by lack of maintenance, repairs and faults. Some areas have reached the end of their serviceable lifespan. It would be beneficial to have these issues rectified to ensure the roof is compliant and increase longevity.