It is because there is nothing under the roof tiles to catch the leak and drain it away.
Low pitch roof tiles leaking.
Of course it won t stop any water getting past the roof finish whether tiles or slates but the construction i mentioned for low pitch roofs will prevent any water that gets past the roof finish leaking into the building.
Low pitched roof tiles.
For example soak the downhill side of a chimney first then each side then the top on both sides.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Like freddie i can t get my head around building a flat roof then whacking a load of fixings through it.
Isolate areas when you run the hose.
Areas such as eaves abutments and window surrounds require careful detailing to ensure a durable and watertight roof system.
When the batten support behind the top row of tiles is too low the tiles sit on a lower pitch.
They lay flatter and this is the cause of the gap to the tiles on the row below.
Roof tiles start to do poorly when the roof pitch gets less than 20 degrees.
Leaking low pitch roof.
However at a low roof pitch components of a roof system may be working at the limit of their capabilities meaning more chance of failure.
The leak is right above the ceiling stain.
I e water leakage under extreme weather conditions.
Start low soaking the area just above where the leak appears in the house.
Get a flat roof material on it nowt else from the outset.
Plus the shallow pitch looks alien regarding anything tiles.
The whole flat roof below a fake tiled roof all seems like a complete bodge to me.
My house has marley modern interlocking concrete tiles and a shallow pitch roof not that shallow but shallow anyway.
It s not the flange that overlaps the adjacent tile that causes a leak if.
If you do get stains on your ceiling it makes our lives as roof leak busters a lot easier.
Interlocking tiles are generally suited to a minimum pitch of 22 5 degrees with the exception of going down to 17 5 degrees if there is an 18mm ply put in place on top of rafters felted counter battened breathable felt laid then battened out for a 100mm headlap on the tiles.
The kitchen extension and the lean to extension are both have a single pitched roof with clay pantiles on them.
Low slope roofs are often more susceptible to leaks.
The roof pitch on these is very low around 9 degrees on the lean to extension and around 12 on the kitchen extension.
If it is steeper than around 20 degrees it will be ok.
Whether it is a problem depends on the pitch of the tiles under the capping.
