Tempo:
Eavestroughs and Downspouts
Eavestroughs and downspouts are not required by the NBC but are recommended because they direct roof water away from the house, resulting in reduced groundwater adjacent to the foundation. However, in sub-zero temperatures, they can impede removal of roof water and contribute to ice-damming problems (see Figure 100 on p. 139).
Metal brackets fitted inside the trough are used to attach eavestroughs. Corrosion-resistant spikes 150 mm (6 in.) long and spaced about 750 mm (30 in.) apart may be used. A metal spacer tube is placed between the interior surfaces of the eavestrough, and the spike is driven through the eavestrough and the spacer into the fascia board and supports.
Metal eavestroughs are available in continuous, one-piece lengths or in segments that are joined and sealed on-site. Fittings such as inside and outside corners, downspout connectors and elbows are available in sizes and angles to suit installation requirements. Plastic materials are also used for eavestroughs and downspouts.
Downspouts may be rectangular or round. Those made from metal are usually rectangular and corrugated for added strength. The corrugated patterns are also less likely to burst when plugged with ice.
Install eavestroughs after the exterior finish is complete. Mount them on the fascia board as close as possible to the shingle overhang, with a slight slope toward the downspouts.
Goosenecks, composed of elbows and short sections of downspout piping, are used to bring the downspout in line with the wall. Downspouts are fastened to the wall with straps and hooks. At least two hooks or straps should be used with each 3 m (10 ft.) length of downspout.
Eavestroughs and downspouts are not required by the NBC but are recommended because they direct roof water away from the house, resulting in reduced groundwater adjacent to the foundation. However, in sub-zero temperatures, they can impede removal of roof water and contribute to ice-damming problems (see Figure 100 on p. 139).
Metal brackets fitted inside the trough are used to attach eavestroughs. Corrosion-resistant spikes 150 mm (6 in.) long and spaced about 750 mm (30 in.) apart may be used. A metal spacer tube is placed between the interior surfaces of the eavestrough, and the spike is driven through the eavestrough and the spacer into the fascia board and supports.
Metal eavestroughs are available in continuous, one-piece lengths or in segments that are joined and sealed on-site. Fittings such as inside and outside corners, downspout connectors and elbows are available in sizes and angles to suit installation requirements. Plastic materials are also used for eavestroughs and downspouts.
Downspouts may be rectangular or round. Those made from metal are usually rectangular and corrugated for added strength. The corrugated patterns are also less likely to burst when plugged with ice.
Install eavestroughs after the exterior finish is complete. Mount them on the fascia board as close as possible to the shingle overhang, with a slight slope toward the downspouts.
Goosenecks, composed of elbows and short sections of downspout piping, are used to bring the downspout in line with the wall. Downspouts are fastened to the wall with straps and hooks. At least two hooks or straps should be used with each 3 m (10 ft.) length of downspout.
©
2026
Lehal.net