Flat Roof Meets Wall Leaking After Heavy Snow

It could be that a vent is leaking further up on the roof and the water is traveling down a rafter before entering the wall.

Flat roof meets wall leaking after heavy snow.

After heavy rain just not discovered a leak. Looks slightly damp above the door to one side so i guess water is coming down the outside wall past the flashing behind the dot and dab plasterboard and landing on top of the french door. Ice dam leaks plague people in the snow belt. Mold on exterior walls or where roof and wall meet.

If your roof vent only leaks during heavy rain you may be able to create a shield to prevent the rain from entering the vent. Ice damming can also occur at flashing points so it is also important toclean debris snow and ice from the walls where they hit the roof or terrace because the melting ice or snow will jump the flashing. The slope should be a minimum of 1 in 80 but in practice a minimum slope of 1 to 40 should be used to allow for deflection of the roof and for normal building tolerances. The homes and structures which are most susceptible to snow damage are those who are uninhabited and or poorly maintained when snow keeps accumulating unchecked over time.

Ice dams block the natural flow of water down a roof. Possible solutions flexible sealant apply flexible sealant to cracks or holes in the brick mortar or home siding. So the chances of roof damage from too much snowpack are minimal after a single snow event. Metal roofs leak under these circumstances.

If a roof leaks whether it has rained heavily or not then there is a good chance that there is an easily identifiable eg broken roof tile or hole in roof cause. When ice or snow fills a gutter any resulting melting water can go over the top of the gutter and back up the roof and penetrate the roofing tiles or shingles. Below are two photographs of roof wall step flashing completed and effective of a slate roof against a brick wall below left and in process with step flashing against a dormer sidewall before the dormer siding has been put in place below right. The water begins to back up under flashings shingles tar paper etc.

During the wintertime roof valleys may collect more snow or ice than the flat slopes of your roof and could cause problems when the snow melts. Proper roof wall abutment flashing examples. Some metal building manufacturers will not warranty a roof with a 1 4 inch slope. Others allow a 1 4 inch slope.

For clarity flat roofs actually have a slight slope to allow rain water to drain off the roof but they seem flat when compared with more traditional steeply sloped roofs. When the snow piled up on the roof melting occurred and ice dams resulted in water ponding 3 inches deep. Once water begins to flow into the house it can drip for days. Water coming down the side of the old french door now doorway to house extension and trickling to the floor.