Add in large dormers and you are contending with valleys very steep valleys.
Gutter guards for mansard roof.
These gutter guards feature a wire or plastic grid that installs by lifting the bottom row of roof shingles and then sliding the edge of the screen beneath so the weight of the shingles holds it in.
Waterloov s flat rear edge is installed under either the first or second course of shingles.
Anything that protects the first few feet of soil from the roof water will help quite a bit.
Gutters for a mansard roof.
Make sure the soil is graded properly away from the house and pave the area for the first few feet with concrete asphalt or even pavers laid tight over a well packed bed of stone dust.
The water can be so concentrated at the valleys that gutter guards will impede the flow of the water and instead of letting the water into the gutter the water flows over.
Surface gutters may be an option.
It can be installed on all roof pitches from flat to mansard vertical and on all types of gutters.
This isn t always possible on long gutter runs because the gutters need to be pitched so the water flows to the downspouts which means one end will need to be hung high.
This type of easy on gutter guard works only if the guard is installed at an angle that s similar to the slope of the roof.
Another issue with gutter guards and mansard roofs has to do with the way they are installed.