Roof Insulation Eaves Detail

The architect john milnes baker defines eaves in this simple way.

Roof insulation eaves detail.

In cool or cold weather moisture laden air drawn into the attic or roof cavity will leave its moisture as condensation on the roof deck underside or in the attic or roof insulation. Inside your home usually in the attic the eave is the angle where the roof meets the outside wall a good place for insulation as long as it doesn t get into the soffit the underside of the overhang. Order and install oversized or raised heel trusses figure 3 or install site built rafters with raised top plates figure 4. The cavity is closed with a proprietary cavity closer.

Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. The lower edge of a roof which projects beyond the face of the wall. A notch is taken out of the rafter known as the birds mouth. Install special roof intake venting products that work at the lower edge of the roof decking underneath the first course of shingles.

How to construct a roof with full insulation at the eaves. The wallplate is then used to secure the rafter to. The eaves detail shows where the roof members and coverings meet the wall of the dwelling. Fix a rafter spacer tray to provide a clear air path between underlay and insulation.

The cavity is closed with a proprietary cavity closer. A minimum ventilation gap of 25mm is to be provided over the loft insulation to allow sufficient ventilation at the eaves. If a sprocketted or bell cast detail is used then eaves courses should be no lower than the minimum recommended roof pitch. The next important aspect is to detail the eaves allowing adequate ventilation and simple methods to achieve this are indicated in figs.

Detail summary detail to show the buildup of new loft insulation to the underside of an existing eaves installed internally to allow ventilation of the existing roof over the new insulation. Fix timber fillet to set eaves courses of tiles at same pitch as general tiling. Eaves detail the eaves detail shows where the roof members and coverings meet the wall of the dwelling. The wallplate is secured to the internal wall separated by dpc.

Open eaves with ventilating rafter tray. The wallplate is then used to secure the rafter to. The wallplate is secured to the internal wall separated by dpc. 8 23b allows any water which may have penetrated through the tile to run down the roof slope into the gutter in the normal manner.

Smart vent a special roof eaves vent product that provides a 3 4 opening about 6 above the top of the roof.