Residential Flat Roof Detail

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.

Residential flat roof detail.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. 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. 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. Waterproof membrane to prevent water penetrating the structure and interior of the.

Flat roofs make replacing a roof a challenge. That will help you remember certain factors and details to build the best possible flat roof. A flat roof usually consists of the following. Having a manual for warm flat roof construction with details and a summary of rules to follow helps.

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. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. This could mean flat roofs may not raise the same red flags they used to. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.

Pvc membranes are easy to maintain and repair. Of course you don t need to live in a modern house to deal with a flat roof. Flat roofs are hard to replace. However in many u s.

Most modern residential homes have relatively steep pitches. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. Astm e 1592 physical testing was performed on three test roof assemblies in order to determine the wind uplift resistance of an rsprs installed over existing structural metal panel roof systems fastened directly into purlins. Flat roof systems are a bit of an outlier.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Flat roof construction for residential. Wind uplift is a primary concern when installing a retrofit single ply roof system rsprs over a structural metal panel roof. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

However depending on the severity of the damage and the type of material installed repairing a flat roof can cost as much as 600 800. A typical flat roof repair costs at least 350 400 and involves locating sources of leaks and patching the seams or holes. There s a lot to know about flat roof systems and how they. Cities with older housing stock think federal hill in baltimore or alexandria virginia s old town the roofs are often flat or have very low slopes.