If you have gutters installed all around your house there may be few sections around the house where the water works its way through behind the gutters. During winter months there may be ice build up as well.
When replacing a roof first layer of shingles are installed backwards to create a straight edge. Normally they are called starter strips and they stick out almost an inch from the fascia. Second row of shingle are installed right over the starter strips. Suppose of starter strips are to act as an drip-edge to allow water to run down without making contact to plywood or get behind the fascia and cause damage. If you have water dripping from your soffit, it is caused by not having starter strips or drip-edge installed properly or you have damaged shingles causing water damage.
Drip-edge is the first thing that gets installed on the fascia. Ice and water shield gets installed right over the drip edge and followed by tar/felt paper overlapping from button to top. Having a second layer of protection under neat the shingles is beneficial to every home. If wind has flipped or tore some of your shingles tar/felt paper will protect the plywood from water damage until all the necessary repairs are completed. If the water does make its way under neat the shingles it will run right into your gutter if you have any. It will slow down the process of water damage before it is corrected.
When it comes to replacing a pitched or flat roof it is highly recommended to take all the necessary steps to get the job done right.
We are a local roofing company located in Ottawa, Ontario offering residential and commercial roofing and siding services. We are fully insured and registered. If you are looking to get an estimate for your new project, contact us and we will be more than happy to provide you a free estimate.