At that time we used 1 2 pressure treated plywood.
Rainscreen detail flat roof.
Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.
Intercept modular metal panel systems interrupt conventional thought on rainscreen wall systems to inspire spectacular visual results.
Changes to the building code mean that in some parts of canada in particular coastal areas with high precipitation rainscreen detailing is mandatory.
If the attic is ventilated morgan says a rainscreen detail on the roof is unnecessary.
I ve been doing rain screen installs since 2002 when i learned the technique in portland or.
Having a manual for warm flat roof construction with details and a summary of rules to follow helps.
As long as the cap flashing is sloped to the roof the additional water that gets behind the rainscreen panels is negligible.
Another detail not mentioned is how to connect a roof rain.
I can see the need for this detail with spray foam applied to the underside of the decking but also with any vaulted ceiling system or attics with any type of insulation obscurring the underside of the roof deck.
The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.
The cavity helps wall assemblies dry out.
That will help you remember certain factors and details to build the best possible flat roof.
For an animation on what is a rainscreen follow this link.
Is the topside rainscreen air space detail opened to the outside so that air can circulate through it.
The rain screen battens can be made from many materials.
I ve also used rips of hardiplank and standard 1 4 s.
About ice dams admittedly a concern that rarely plagues homes with metal roofing is to apply 2x4s on the flat on top of the roof sheathing with one 2 4 over each rafter or truss.
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.
Flat roof construction for residential.
When ventilated properly with a minimum 1 4 gap to the exterior at bottom and top of the rain screen and a minimum 3 8 deep vertical cavity in between the volume of air passing through the rain screen cavity can be measured in the 10s even 100s of air changes per hour.
However whether or not the code requires a rainscreen it is a better way to detail exterior cladding of buildings.
With countless combinations colors and multiple finish options intercept panels can inspire the artist at the core of every architectural designer.
The third and last example is perhaps the most complicated.
