Buddina Roof Inspection Report Purpose:

Provide a roof condition report following a Buddina roof inspection. References are made to several Australian building standards including N.C.C 2016 Vol.2, AS 1562.1, AS 1562.3 & SA HB 39 2015: The Installation Code for Metal Roofing and Walling. Manufacturer’s Instructions that are referenced are attached to the report. We also provide recommendations to extend longevity. This inspection is notable as it features a property using shingles, a roofing material not often used in Australia.

Findings & Recommendations In Buddina Roof Inspection

Evidence of insufficient overhang measuring only 20mm (approx.) into the box gutter. This does not comply with manufacturer’s instructions and is therefore relying on roof sarking to stop future ingress, also evidence of excessive sarking which will break down under the sun’s UV rays.
Box gutter is non-compliant to AS 3500.3 refer 4.4.2 and SA HB39 refer 5.3.3(b) as shown. Also flashing joints are heavily reliant on silicone, which has no longevity and have insufficient fasteners, noncompliant to SA HB39 refer 8.2 and 5.8.3 as shown. If not rectified this will lead to ingress.
Barge flashings in various areas have been fitted over the roof tiles using silicone, which has no longevity, this is likely to cause ingress in driving rain and heavy wind conditions. It is not possible to determine if compliant installation of roof tiles under the barge flashings has been achieved.
As a result of water ingress, almost all of the barge flashings have been stuck down to the roof tiles using waterproof membrane, which does not comply to manufacturer’s instructions which is just a temporary repair and gaps are present. This is likely to trap in water and lead to corrosion and future ingress.
Apron flashing requires a pressure flashing. Installing a pressure flashing will ensure longevity and make it compliant, as shown below.
As a result of water ingress, all of the Velux windows have been stuck down to the roof tiles using waterproof membrane, which does not comply to manufacturer’s instructions and is just a temporary repair and gaps are present. This is likely to trap in water and lead to corrosion and future ingress.
As a result of water ingress, all of the ridge flashings have been stuck down in the direction of water flow to the roof tiles using waterproof membrane, which does not comply with manufacturer’s instructions and is just a temporary repair and gaps are present. This is likely to trap in water and lead to corrosion and future ingress.
Multiple pipe penetrations are problematic, require ongoing maintenance and are heavily reliant on silicone which has no longevity due to breaking down under the sun’s UV rays, and waterproof membrane which is a temporary repair. We recommend the use of the PVC gooseneck method with solar tank installations. Ingress is likely occurring in this area.
Pipe penetration and aerial cable have been stuck down to the roof tiles using a waterproof membrane Dektite, this is likely to trap in water and lead to future ingress.
Downpipe spreaders non- compliant to SA HB39 refer to 5.7.7 as shown. No end cap to prevent discharge against the direction of flow. On rainy days water will flow straight under the barge flashings and lead to ingress. Sarking is also required beneath downpipes on tiled roofs, Non-compliant to NCC 3.5.1.2.as shown.
Downpipe spreaders non- compliant to SA HB39 refer to 5.7.7 as shown. No end cap to prevent discharge against the direction of flow. Discharging water over tile laps.
Box gutter is non-compliant to AS 3500.3 refer 4.4.2 and SA HB39 refer 5.3.3 as shown. Box gutter is ponding at the outlet due to being obstructed by the flashings. The outlet should be the same width as the box gutter. Total drainage is required of all roof components. Flashing joints are not all undersealed, and some are heavily reliant on silicone which has no longevity, and breaks down under the sun’s UV rays, 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.
Parapet wall cappings have not been provided with an anti-capillary break, also, parapet wall cappings have been fixed into the apron flashing, this will result in lack of expansion, noncompliance to SA HB39 refer 8.1.3 as shown.
The insulation blanket overhang from under the roof sheets is protruding towards the box gutter. The insulation blanket acts like a sponge and absorbs water back into the insulation in the roof cavity. If not rectified this may lead to ingress.
Roof sheets have not been turned down into the box gutter as per manufacturer’s instructions
Parapet cap flashings shown with inadequate fall, non-compliant SA HB39 refer 8.7 as shown. Parapet cap flashing has not been provided with a minimum 3 degree fall towards the roof coverings and are resulting in ponding, non-compliant to AS 3500.3 refer 4.4.3 as shown.
Parapet cappings have not achieved the 50mm effective coverage and evidence of insufficient box gutter upstand, not achieved 75mm. Also, the sump has insufficient depth. This is at substantial risk of ingress, non-compliant to SA HB39 reference 8.1.4 and AS/NZS 3500.3,3.7.4 as shown.
Dropper has not been installed to the soul of the box gutter and will result in ponding and corrosion of the box gutter, non-compliant to AS 3500.3 refer and SA HB39 refer 5.3.3.
The parapet flashings have been fastened through the top of the flashing and have exposed standard neoprene washers and plastic wall plugs to a floodable flat surface. Non-compliant to SA HB39 refer 8.7as shown.
Apron flashing joints are heavily reliant on silicone, which has no longevity and breaks down under the sun’s UV rays, and insufficient fasteners, non-compliant to SA HB39 refer 8.2 and 5.8.3 as shown above.
Ridge cap pointing has weep holes present, however due to the design of the ridge caps, there is a gap at the bottom of the joint to the ridge caps blocked by the pointing, therefore water can get in but cannot get out and is relying on the weep holes, if not rectified this will lead to ingress.
Numerous, dropped roof tiles to the valley, resulting from lack of tile clips being installed, if not rectified may lead to ingress. Information regarding installation of roof tile valley is shown below.
Roof valley catchment area exceeds 20m2 within the affected area, this is not compliant to standard (may not have been applicable during original construction.) Non-compliant to SA HB 39 2015 refer 5.4 (k) as shown.
There is evidence of sarking present, and the pitch of the roofs are between 15.40 and 34.65 degrees, which in some areas are under pitched. The minimum roof pitch for this design of tile is 20-degree pitch without sarking and 18- degree with sarking.

Conculsion Outlined In Buddina Roof Condition Report

There are non-compliant issues as noted in this report and it would be beneficial to rectify these to ensure the roof is compliant and increase longevity.