R Value Of Green Roof

A green roof may improve property values and marketability especially in urban areas with little green space.

R value of green roof.

Every construction design architect engineer a e knows a material s r value is an important factor when specifying insulation products with many regulations requiring minimum values for wall ceiling and roof assemblies. R value of about 2 5 ft f btu. You should of course see the manufacturer provided technical data sheet for the r value of specific products. See how this roof went from bare to bountiful plus the latest on living roof diy options.

Codes may specify a smaller r value for these components compared to the rest of the roof. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Recommended home insulation r values. Traditional roof green roof n sensible et r q q q substrate 0 where r n net radiation q sensible sensible heat flux due to convection q et.

For example a code may require that skylights have only an r 5. Green roofs reduce the temperature of the building and the surrounding air in multiple ways. Neglected thermal storage moisture dependent performance and. Let s imagine a roof that should have an r 30 value.

Determining insulation r value accuracy. R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value. They provide shade to the top of a building evapotranspiration.

R s landscaping did the job here. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. 2003 evapotranspiration schmidt 2003 berghage et al. Hardy sedums are most popular for green roofs because they thrive in a soilless growing medium and are drought tolerant.

Green roofs can have lower energy cost than conventional roofs and sometimes compete well against white roofing effects are more pronounced for lodging buildings. R value minke et al. For a very good introductory overview article on r value see r values over at the website of. R value of various materials.

1982 wong et al. The higher the r value the better the thermal performance of the insulation. Skylights and roof hatches are another component of roof thermal performance. At 40 pounds each the trays are heavy and meant to be installed by a certified contractor.