Rainscreen Detail Flat Roof

Then you install a second layer of roof sheathing followed by roofing underlayment and roofing.

Rainscreen detail flat roof.

The davidson residence above uses a built up flat roof deck at the center portion of the house the portion with the guardrails. Flat roof construction for residential. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs. They are ideal for climates that don t experience large quantities of rain and moisture.

Intercept modular metal panel systems interrupt conventional thought on rainscreen wall systems to inspire spectacular visual results. Flat roofs have unique architectural characteristics that make them desirable in many situations. Flat roofs are hard to replace. A rooftop garden or additional outside living space are the top reasons people choose flat roofs.

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. If the attic is ventilated morgan says a rainscreen detail on the roof is unnecessary. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. The roof mikkelsen says is insulated with spray polyurethane foam applied on the underside of the sheathing meaning the roof is not ventilated.

The cavity helps wall assemblies dry out. This could mean flat roofs may not raise the same red flags they used to. Centria offers ecoscreen perforated screenwalls which provide an airy aesthetic. On top of your first layer of roof sheathing you install parallel 2x4s on the flat from eave to ridge with one 2x4 above each rafter or truss.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. Install these perforated metal panels vertically or horizontally. As long as the cap flashing is sloped to the roof the additional water that gets behind the rainscreen panels is negligible. The 3 most common drain systems of a flat roof.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. This creates your 1 5 inch deep ventilation channels. 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.