1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many.
Low pitched roof construction.
But the taller profiles like standing seam and pbr shown below can be installed on roofs with as low as 1 4 or 1 2 in 12 pitch.
No roof of course should actually be completely flat.
Pitched or sloping roof.
Flat pitched cold warm roofs flat roofs.
A pitched or slanted roof has a terrain of at least 15 but it is often much more.
Their fasteners are either concealed or screwed at the top of a ridge which makes them less likely to leak.
The basic cold roof construction consists of rafters set at up to 600mm centres underlay laid horizontally over the rafters with a slight drape between each rafter and tile battens nailed directly through the underlay into the rafters.
Some roofs have extremely low slopes and appear to be nearly flat.
Roofs with pitches of 10 to 20 are often called low pitched roofs and special considerations need to be made particularly on the overlap between tiles to avoid water being blown into the roof by the wind.
For a low slope residential roof there are two main options.
The lower the roof pitch the more difficult it becomes to construct an effective eaves system particularly where roofspace ventilation is required.
Polymer modified bitumen sheet membrane these.
Built up roof membranes bur this system is formed by creating a finished membrane of reinforcing fabric and.
Remember that the eaves course tiles carry all the rainwater that the roof face has collected and must shed that water safely into the gutter.
Low slope structural roofing generally used on roof pitches ranging from 12 to 3 12 consists of interlocking panels commonly called standing seam roofing that run vertically along the roof surface.
Single ply membranes low pitch roofs these comprise thermoplastic membranes and thermoset membranes.
If you re worried about the security of your domestic extensions whether they be garages sheds.
Read part 2 pitched roof construction.
They include the following.