Flat Roof Into Pitched Roof Detail

Introduction to green roof details a green or living roof is a flat or low pitched roof with a layer of planting over the waterproofing.

Flat roof into pitched roof detail.

Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. A 900 square foot flat roof in the san francisco area made of concrete tiles costs. One of the first things you need to consider before converting your flat roof into a pitched roof is the reasoning behind the transformation. Most homeowners choose to convert a flat roof to a pitched one using a simple trussed roof with two angled planes.

This green roof details post includes excerpts and details from our book understanding architectural details residential. However flat roofs require much more aggressive and consistent maintenance than a pitched roof. It is a significant renovation if you are converting from flat to pitched. Additional valleys angles and gables can be built into converted roofs as well but adding these elements may affect your project.

A very important detail is where the flat roof is connecting the pitch roof. While that s the easiest route it s certainly not your only option. Depending on the climate your flat roof will only last between 15 and 30 years if well maintained. A pitched roof is more expensive.

Some will choose to keep their pre existing flat roof on their structure underneath the new pitched roof to save removal costs but others might not be able to consider that option. Armourfix and armourvalley membranes must be installed and extended 60 90 cm up the main roof underneath the shingles in order to assure a waterproof connection. The starter strip and first row of shingles must be applied 25 cm from the bottom of the slope roof or main roof above the slope transition. Flat roofs also don t last as long.

According to improve net s online roofing calculator a flat roof is significantly cheaper than a pitched roof. For instance where flat roofs are converted into pitched roofs during refurbishment projects because the latter allegedly exhibit better insulation characteristics or where flat roofs are not. 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.