Common Faults
Here are some common faults and leaks with roofs.
Faults with Valleys
Faults with Verges
This is an example of a racking verge; in this case it did have a dry verge fitted. The dry verge had been blocked by leafs from an overhanging tree, sending the water passed the verge and onto the felt and batten, rotting the battens and the felt.
Racking verges are a difficult problem; if the roof has a more extreme rack in the verge it is better to use guttering. In most cases dry verge will do.
A raking verge should be treated as a valley.
Faults with eve's
This image is of rotting felt on the eve, as you can see the felt has rotted through. One of two things can happen in the house here, if there is a sofit and a cavity wall, the water will penetrate above the window or door below. If there is no sofit and cavity wall the water will come through the corners of the sealing.
Faults with chimney stacks
Faults with flat roofs
Chimney stack to fibreglass flat roof. Lead to front apron and to side abutment has been fiberglassed over. Lead should be removed, fiberglass put up walls of stack and lead ontop. What has happened here is the fiberglass has cracked around the lead and the water has gone under the lead and fiberglass.