Flat Roof Detail

Daniel bosworth design technical manager at sig design technology examines best practice for this important discipline.

Flat roof detail.

This drawing illustrates the overall concept of flat seam roofing. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. A flat roof must be strong durable and stable throughout its lifetime. The longitudinal seams are typically continuous whereas the transverse seams are staggered.

Waterproof membrane to prevent water penetrating the structure and interior of the. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. The pans should be installed so that water always sheds from one pan to the underlying pan. A flat roof usually consists of the following.

In the warm flat roof construction there is insulation packed into every possible space where air can flow. It must provide adequate protection against the elements keeping the buildings structure and interior dry. Typical flat seam roof. Flat roof penetrationsflat roofs that are durable and fit for purpose rely on many factors not least the correct detailing and implementation of penetrations.

Each pan is cleated to the roof deck. We love the flexibility of a flat roof for certain design limitations but they have a bit of reputation for leaks and repairs. 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.

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. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Flat roof types. This could mean flat roofs may not raise the same red flags they used to.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Flat roofs are hard to replace.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.