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Roof Membrane Substrate Replacement

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General Building
Wellington

There are three flat sections on my roof which are covered with butyl rubber membrane. The total area is about 44 square meters. I want to replace both the membrane and the roof substrate on all three sections. I am replacing the substrate because I believe it is currently particle board, even though the house plans indicate it should be plywood. I have split the job into two parts, for a builder to replace the substrate, and, for a roofer to replace the membrane. I am looking for a Certified (CBANZ) Builder to provide a quote including the following items: 1.Coordinate the timing of the job with the Roofer to minimise the time between the substrate being replaced and the new membrane being installed. 2.Arrange the purchase and delivery of a suitable number of 17mm CD H3.2 CCA treated plywood [phone] x [phone] sheets. Alternatively, you can tell me how many sheets you require and I will order them on the LumberShop website at the retail cost of about $107 per sheet (delivered). I have included a diagram of the three roof areas with this request. 3.Remove the existing roof membrane and stack on site. I will arrange disposal at a later date. To do this you will also need to carefully remove some existing metal roof tiles, flashings and weather boards to be re-used when the new membrane is installed. 4.Remove the existing substrate and stack on site. I will arrange disposal at a later date. 5.Install the new substrate in full compliance with current New Zealand Building Code Clause E2/AS1 for Membrane Roofs and Decks. This will require altering the existing fall (currently 1 in 80, or less in some parts) to a minimum of 1 in [phone] °) on the two largest roof sections. Some existing weather boards may also have to be modified ( I have the paint for them if required). The building code requires that the plywood to be fixed with stainless steel screws. 6.Provide temporary covers over the substrate until the new membrane is installed.


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