Burleigh Waters 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.
Inspection Site Gallery
Findings & Recommendations In Burleigh Waters Roof Inspection Report
- Roof pitch measured in several locations and not found to be more than .4 degrees. There are no known roof profiles which are compliant at this pitch. The product chosen is monoclad and / or equivalent and is only suitable for a pitch of 2 degrees or greater. There are several areas of water ponding on the sheets, particularly when coupled with foot traffic.
- Images show foot traffic damage causing severe ponding and is non compliant to SA HB 39 B6.5.1 and B 6.5.2 They also show severe rusting where flashings, roof sheets and gutter have not been cleaned out after drilling.
- All sumps are holding water and debris. They are not tapered towards the drop and so holding water and showing early signs of rust.
- Flashings under the wall are rusty, have evidence of fixings protruding under the flashing and inadequate fall which will not allow water to drain.
- Masonry fixings at 800 centres. Silicon filler not angled and holding water in places. As per SA HB 39 refer 8.4 fixings should be at 100mm centres.
- All flashings and gutters are to be installed to allow for thermal expansion. There are two runs of awnings – one being 96 metres and the other 87 metres. There is no evidence of any expansion joints in either gutters or flashings. Many of the rivets on the front flashing have popped out as a result.
- There are a number of fixings which are reacting to the environment for unknown reasons. Suggested contacting screw suppliers for their opinion. I believe the supplier in this instance may be Bremick. In any instance it would be prudent to replace all fixings which are oxidizing. The large wrap around flashing on the front of the awning only has 100mm of cover over the roof. Minimum cover is 150mm.
- Flashings on either side of the pop up wall do not provide adequate cover – no dry pan. Refer Lysaght Roof and Wall manual 11.2.1
- No dry pan provided either end of the box gutter. Silicon sealant running down the edge of flashing and roof sheet has no longevity.
- It would be prudent to spread the water into the sole of the box gutter with a series of drilled holes in the pvc. It is currently unloading in one spot towards the end of the roof sheet
- Large unsupported flashing which is ponding which will result in accelerated corrosion of the flashing. The flashing needs support and fall.
- Over reliance on silicon which will not provide longevity.
Building Code References In Burleigh Waters Roof Inspection Report
B6.5.1 Surface Damage
Badly damaged panels should be replaced and the manufacturer consulted for the best way to remove and replace the panels. Minor damage can often be repaired in situ.
B 6.5.2 Sheet Damage
A dent, split or puncture in the external skin should not be left untreated as it will accelerate corrosion and, in some insulated products, absorb water into the insulation core. On a roof, it is sometimes possible to repair by over-skinning with a matching profiled skin. All edges are to be sealed to prevent moisture getting between the two skins. On a wall, it is not usually possible to over-skin and in this instance replacement of panel is generally the preferred option. The panel manufacturer should be consulted as to the preferred option.
3.6 Cleaning Up
Normal installation practises such as drilling and cutting usually leave offcuts and metallic swarf on or around the roof area. These materials and all other debris, including blind rivet shanks, nails and screws are to be cleaned from the roof area and gutter regularly during the installation process as unsightly staining of the surface due to oxidation of the metal particles will result, leading to corrosion and possible failure of the roofing material or guttering. Where practicable, the entire installation should be cleaned down with a blower vac, swept or, alternatively, if a water supply is available, hosed down at the completion of the work.
5.3.3 Outlets
- In addition to the recommendations of Clause 5.2, particular attention is to be paid to the following:
- Sumps and rainheads All box gutters to discharge through either a sump or a rainhead as shown in Figure 5.3.3
- Gutter discharge Box gutters to discharge at the downstream end without change of direction (i.e. not to the side)
- Outlet Outlets from sumps and rainheads to be tapered to fit into the top section of downpipes.
- Installation To permit total drainage of the rainhead or sump, outlets to be installed so that, on completion of the installation, no part of the outlet is above the sole of the sump or rainhead.
5.3.5 Workmanship
Gutters, sumps and rainheads are to be kept free of debris during installation. On completion of the installation, all debris is to be removed to prevent them entering the downpipes and stormwater drains.
8.1.3 Expansion Provision
Roof flashings and cappings are to be installed to permit longitudinal expansion and contraction without detrimental effect to the flashing themselves and other roof components, structures and covers.
Roof flashings and cappings fastened to metallic roof covering materials are not to be fastened to other building materials with other than sliding cleats or fixings.
Conclusion
- It is recommended that these awnings be re-battened with tapered battens to create enough fall for compliance i.e. at least 2 degrees for trimdek.
- Box gutter and flashings need to incorporate expansion joints.
- Sumps should be replaced with tapered bottoms so that they do not hold water and have sump guards fitted so that they do not block up.
- All flashings should be installed so that they do not pond water.