Super Insulated Roof Design

A second non load bearing 2 4 stud wall is built on the interior.

Super insulated roof design.

In general this level will also be the most. 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. Similar to the roof every piece of syseal fabric is custom made for each order and spans the bay s width. Highly insulated ceiling or roof.

However there is one tight spot that needs special attention. Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. Reformulate or coat black membranes to make them reflective. Ample vertical space about 22 inches is ideal exists under most roof slopes to achieve r 60 insulation.

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. 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. The simple saver wall insulation system is installed completely from the inside out of the wind and weather. To maintain a continuous air barrier the stego wrap is connected to the zip sheathing on the walls which doubles as the air barrier.

The kropper house was the first super insulated retrofit in the us. There are three methods for insulating the top side of the building envelope box. Double walls have been built since the early days of super insulated houses. 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.

Control of ice dams moisture accumulation and heat gain can also be facilitated by unvented roof design. With three layers of 11 2 in. Blow insulation onto a flat ceiling. 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.

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. Built up roofs consist of a base sheet fabric reinforcement layers and usually a dark protective. Polyisocyanurate insulation above the sheathing and approximately 91 4 in. The vapor and dew point profiles for our climate showed the potential for condensation on the inside face of the exterior sheathing.

Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof.