Ice dams block the natural flow of water down a roof.
Flat roof meets wall leaking after heavy snow.
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.
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.
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.
Water coming down the side of the old french door now doorway to house extension and trickling to the floor.
Mold on exterior walls or where roof and wall meet.
Ice dam leaks plague people in the snow belt.
After heavy rain just not discovered a leak.
If a roof only leaks in heavy rain then the above reasons come to mind first and it gives us an easy starting point to successfully track down the cause s of the leak s.
When the snow piled up on the roof melting occurred and ice dams resulted in water ponding 3 inches deep.
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.
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.
Or those which have undergone improper renovations where load bearing walls might.
Some metal building manufacturers will not warranty a roof with a 1 4 inch slope.
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.
Possible solutions flexible sealant apply flexible sealant to cracks or holes in the brick mortar or home siding.
The water begins to back up under flashings shingles tar paper etc.
So the chances of roof damage from too much snowpack are minimal after a single snow event.
Once water begins to flow into the house it can drip for days.
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.
These leaks can happen even if everything on your roof is just fine.
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.
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.
Proper roof wall abutment flashing examples.
Metal roofs leak under these circumstances.
