Wind uplift is a primary concern when installing a retrofit single ply roof system rsprs over a structural metal panel roof.
Residential flat roof detail.
Of course you don t need to live in a modern house to deal with a flat roof.
Flat roof construction for residential.
Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.
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 roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules.
Flat roof systems are a bit of an outlier.
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.
Waterproof membrane to prevent water penetrating the structure and interior of the.
Just enough slope to drain water but also flat enough to be a problem if not constructed properly.
A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.
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.
A typical flat roof repair costs at least 350 400 and involves locating sources of leaks and patching the seams or holes.
The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.
Having a manual for warm flat roof construction with details and a summary of rules to follow helps.
There s a lot to know about flat roof systems and how they.
However in many u s.
Flat roofs are hard to replace.
Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof.
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.
But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.
Flat roofs make replacing a roof a challenge.
Of all these membrane types epdm synthetic rubber is the most common single ply membrane roof material in both residential and commercial use.
Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.
Pros and cons for flat roof materials all three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof.
That will help you remember certain factors and details to build the best possible flat roof.
A flat roof usually consists of the following.
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.
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.
