Valleys-Shakes

On shake roofs it is recommended that a strip of No.15 (minimum) roofing felt be installed over the sheathing and under the metal valley. Metal valleys should be center-crimped, painted, galvanized steel or aluminum and have a minimum total width of 20" (508 mm). In some areas, however, flashing width requirements may differ and local building codes should be consulted. Shakes should not be applied with their grain parallel to the valley centerline and those extending into the valley should be cut at the correct angle (Figure 15). Joints between shakes must not break into the valley.

---

 

ROOF PROJECTION FLASHING DETAILS

Recommended construction details for applying metal flashing around typical roof projections such as chimneys and vent pipes (Figure 16, Page 15, Figure 17, 18 Page 16).

 

---

 

ROOF FASTENER GUIDELINES

Nails

Each shingle or shake should be applied with two corrosion-resistant fasteners, such as stainless steel (Type 304 or 316), hot-dipped zinc coated, or aluminum nails. If preservative treated shingles or shakes are installed the treating company's recommendations regarding the compatibility of the preservative chemicals with the fastener should be followed. Minimum nail lengths are shown in Table 1, Page15.