Ensure roof valleys
and architectural features on the roof have adequate flashing and waterproofing.
Snow accumulations in roof valleys
can be a real problem; bituthene roofing underlay and all the flashing in the world may not be enough to prevent ice dams that back water up and eventually find a way into your bedroom.
channel a lot of water, so they need extra protection.
Others said they worked well on some areas of their roofs, but at roof valleys
or on very steep slopes, the rain sometimes shot over the edge along with the leaves.
Each beam was an inverted "V." We created a supply air ventilation system by using some of the roof valleys
with horizontal roof segments, creating triangular air ducts.
Are there any signs of leakage around any of the flashing points, such as chimneys, roof valleys
, and vent pipes?
Other signs of roof damage include curling or buckling shingles, compromised roof valleys
, missing shingles, shingle granules in the gutter, or in extreme cases, daylight coming through the roof boards!
Water stains and streaks concentrated around chimneys and roof valleys
indicate flashing and seal failures.
Pay particular attention to areas below roof valleys
where lots of water runs off.
Or ice dams may consistently form at the foot of roof valleys
(the junction where two roofs meet at a right angle; lead photo), because they fill with windblown snow.
8 CHECK the roof framing closely where the roof joins walls and under dormers and roof valleys
, all areas where the flashing might be bad.
When choosing a location for your skylight, take into account any plumbing stacks, chimneys or roof valleys
that may be in the way or too close for comfort.