National building code of canada 2005.
Flat roof ontario building code.
Slope 1 except as provided in sentences 2 and 3 the slopes on which roof coverings may be applied shall conform to table 9 26 3 1.
Or else on the interior of the building just.
According to the ontario building code you should only use corrosion resistant or csa b111 conforming nails for your roofing or re roofing project.
Purpose of roofing 1 roofs shall be protected with roofing including flashing installed to shed rain effectively and prevent water from entering the roof as a result of ice damming.
At that time the ontario building code stated that flat roofs must have a positive roof slope of 1 4 for every 4 run towards drains or draining edges.
Division b part 5 page 5 11 the national building code now dictates that all flat roof deck and balcony areas are considered roofs and when specifying a pvc membrane the product must conform to the referenced standard of cgsb 37 54 current version governing polyvinyl chloride roofing and.
For instance if your roof has a steep pitch you may be able to use 2 inch by 4 inch rafters but if your roof has a low pitch building code may require that you used 2 inch by 6 inch or 2 inch by 8 inch rafters.
Highlights of the ontario building code.
Thermoplastic or elastomeric are the most effective and should extend up adjacent walls at least 150mm from the roof surface.
Hopefully a roofing contractor never makes a mistake with nails.
The ontario building code slope 9 26 3 1.
2 for the purpose of sentence 1 roofs shall include platforms that effectively serve as roofs with respect to accumulation or drainage of precipitation.
Unfortunately many of the older roofs are flat and create pooling on the surface that cancels any warranties offered by manufacturers for roofing materials.
Forming part of sentence 9 26 3 1 1.
See here for a look at the roofing section of the 2018 international building code without amendments as adopted by the state of wyoming.
For low pitch roofs building codes may require larger dimension rafters.
The ontario building code purpose of roofing 9 26 1 1.
Roofing types and slope limits.
The ontario building code requires flat roofs to have a positive slope of for every 4 run towards drains or draining edges.
The nails should at least be 12 mm in length.
However many toronto area homes were constructed with completely flat roofs using built up roofing systems which forgives ponding water on the surface.
1 nails nails used for roofing shall be corrosion resistant roofing or shingle nails conforming to csa b111 wire nails spikes and staples.
Below are the main highlights from the code set to help you assess whether your roofing contractor is doing their job properly.
