Super Insulated Roof Design

In 1979 steve kropper and the rowell energy group undertook the retrofit of a 1911 triple decker a three family home design nearly identical to the estimated 18 000 triple deckers in the city of boston.

Super insulated roof design.

The vapor and dew point profiles for our climate showed the potential for condensation on the inside face of the exterior sheathing. How they can be made cool. In general this level will also be the most. To maintain a continuous air barrier the stego wrap is connected to the zip sheathing on the walls which doubles as the air barrier.

Single ply membranes are pre fabricated sheets rolled onto the roof and attached with mechanical fasteners adhered with chemical adhesives or held in place with ballast gravel stones or pavers. Interior wall and roof condensation was also a concern during design of the monument house because of the very thick walls 12 and roof 18. A second non load bearing 2 4 stud wall is built on the interior. The walls of this house are 2 8 construction with dense pack cellulose insulation r 27 zip sheathing for the air barrier and 6 roxul insulation r 24 for a total insulation value of r 43.

Ample vertical space about 22 inches is ideal exists under most roof slopes to achieve r 60 insulation. Blow insulation onto a flat ceiling. Reformulate or coat black membranes to make them reflective. The simple saver wall insulation system is installed completely from the inside out of the wind and weather.

There are three methods for insulating the top side of the building envelope box. With three layers of 11 2 in. The amount of roof cavity ventilation is specified by numerous ratios of free vent area to insulated ceiling area ranging from 1 150 to 1 600 depending on which building code is consulted the 1 300 ratio being the most common. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof.

Highly insulated ceiling or roof. Control of ice dams moisture accumulation and heat gain can also be facilitated by unvented roof design. Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. Similar to the roof every piece of syseal fabric is custom made for each order and spans the bay s width.

They typically consist of a conventionally framed 2 4 exterior wall sheathed with 1 2 in. Unfaced insulation is simply cut to fit the girt spacings and then impaled onto fast r rigid insulation hangers which prevents the insulation from sagging. To be considered superinsulated a house must have wall and window r values roughly twice as high as those dictated by area building codes. Built up roofs consist of a base sheet fabric reinforcement layers and usually a dark protective.

The kropper house was the first super insulated retrofit in the us.