Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.
Cold flat roof eaves detail.
Flat roof details and information relating to insulating a flat roof.
From there the flat roof system you choose will determine the materials you apply.
If insulation is installed below the flat roof deck this is called a cold roof.
The fall of the roof is achieved by using firring pieces with a fall of 1 in 40.
Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings.
Consider geography budget and use for the roof to determine the best option.
The position of the insulation dictates which type it is.
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Cold flat roofs warm flat roofs inverted flat roofs green flat roofs solar flat roofs.
2011 control of condensation in buildings is the document to view.
Install the ice and water shield membrane so that it laps securely over and bonds to the surface of the drip edge.
In terms of rules on ventilation bs 5250.
The best time to lay a felt roof using cold applied adhesive is when the weather is warm but this means that working on a flat roof can be exhausting work with the sun s heat and the heat reflected from the felt already laid.
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In this type of construction the insulation is placed below the waterproof covering and on top of the roof deck and vapour barrier.
This air is vented at either end of the roof to allow a continuous air flow.
Put simply a warm flat roof has insulation of some kind packed into every available void and a cold flat roof allows air to circulate between the joists.
Points to the installation of ice and water shield along the lower roof eaves protecting against ice dam leaks that are common on un vented roofs in cold weather or snow climates.
The rolls of felt are quite heavy and to avoid damage must be handled with care.
The flat roof shown above shows warm deck roof construction.
Details both in 2d and 3d to give a clear understanding.