The initial expense of green rooftops often turns away prospective clients.
Roofing used under green roofs.
It serves as a moisture barrier as well as a slip sheet.
Below are explanations of the leading roofing membrane systems that have been installed under green roofs.
The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment.
Because green roofs require professional design careful structural analysis and multiple layers and systems even extensive green roofs usually start at 8 per square foot significantly more expensive than the 1 25 per square foot for built up roofs burs source.
The term is used for both so i will talk a little about both.
All three types of roofs require specific layers of roofing materials not found on regular roofs.
When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended.
This type of underlayment is critical to a quality roof installation.
Reflective or cool roofs are materials and coatings used to help keep a building cooler by reflecting solar energy away from the building.
A metal roof under the same conditions may stay more than 50 f cooler than an asphalt roof which saves both energy and money.
Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer.
And to ensure the appropriate green roof assembly relative to the membrane chosen is provided it is important to understand how they work and how they are installed.
The basic anatomy of a green roof consists of vegetation growing medium filter membrane drainage layer waterproof root repellant layer roofing membrane support for plantings above thermal insulation vapor control layer and structural roof support.
Once again this is used on cold roof construction.
The most common design approach over a metal deck is to build a conventional loose laid roof assembly under the vegetated cover.
There are several types of felt underlayment including both organic reinforced and inorganic reinforced.
The rigid insulation material is typically extruded polystyrene xps which is resistant to moisture absorption and has been used in green roof applications for decades.
By green roofs i am assuming you mean vegetated roofs as opposed to reflective roofs.
Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes.
