How To Build A Sloped Roof Over A Flat Roof

The slope on a flat roof is too small to shed water and the shallow slope tends to collect leaves and debris that act like dams.

How to build a sloped roof over a flat roof. A sloped roof is a great way to prevent water from puddling on your roof. Basically a slanted roof style is a flat roof tilted high up at one edge to create a very steep slope. Unlike sloped roofs flat roofs are susceptible to ponding water. A sloped roof is more capable of removing water from the building s exterior and can be an attractive alternative to the flat roof.

This means that the rise of the slope goes up or down 8 inches for every 12 inches. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. Water that stays on a flat roof after it rains will weaken the material over time. If your pergola roof has a slope or is attached to the house the direction of the panels is determined for you.

Significantly cheaper to build than a gable or multi slope roof since there s less material in the 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. The grooves need to point downhill and away from the house. Because the gutter is removed you will need to install transfer flashing from the roof of the house to the patio.

Skillion roofs are one of the simplest roof styles used in shed building. A skillion roof is made up of a single flat plane which slopes gradually from top to bottom. It s similar to a shed or lean to roof or a clerestory roof but has one visible difference. Flat roofing systems come with benefits and drawbacks.

It has a greater slope. For those who have a flat roof and are concerned about leaking and rotting building a sloped roof over the flat roof is an option. Of course you don t need to live in a modern house to deal with a flat roof. Saltbox roofs look like skillion roofs but with an extra short slope opposite the long angled plane like an upside down check mark.

An example for a steep sloped roof is 8 12. When it comes to the disadvantages some property owners are being pestered by leaks. To put it in perspective the angle of this slope would be around 30 degrees. It is almost similar to the first method but to make the patio roof a little bit higher you will need to remove the house gutter and place the back channel a bit higher.

Eventually water penetrates the building. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof.