Code box gutter requirements the minimum width allowed for domestic projects is 200mm.
Box gutter sump.
Box gutters must be straight no bends.
The spigotcan also be fitted from inside the sump this allows the downpipe to be fitted up to the sump.
For the associated box gutter outlet.
The depth shown of the box gutter is the depth at the upstream end.
Must have a constant slope between 1 40 and 1 200.
Sump with a side overflow device sumps do require an increase in the depth of flow in the box gutter and gutters are to be fitted with either.
The theoretical down pipe diameter is shown for reference purposes only.
Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property.
Choose an available size or any other size and enter that for the calculation of the sump.
Down pipe must be.
It is easier to mark and cut the spigothole prior to fitting the sumpinto the box gutter.
The mod tec gutta sump can be fit ted simply from within the fitted box gutter this assists the accurate locating of the sump.
The outlet must be no further than the diameter of the outlet to the centre of the outlet.
For commercial projects the minimum allowable width is 300mm.