W6107fd f15.pdf - form 15 footing & slab design · OPW16/0220

Construction & Maintenance Note 1 - Controlling moisture around the structure (H).

The diagram below is mostly self-explanatory and the aim is to prevent excessive
moisture coming into contact with the foundation soils.
Where watering occurs the moisture must be applied as evenly as possible and the
foundation soils should not be saturated but moistened.

After construction it is not recommended to fill more than 50mm in depth within 3
meters of the structure and where this occurs the ground surface must be graded to
maintain a 1:20 fall away from the structure.

Where landscaping is undertaken the end result must not reduce the drainage around the
structure or creates a situation where moisture is concentrated in a small area so as to
cause uneven wetting of the foundation soils.

                           Gutter & down pipes are to be kept clean of
                           leaves & leaks are to be fixed promptly.
                                                                         Taps are to be turned off, do not
                                                                         leak & have grates to discharge
                                                                         overflow to storm water system.
Plumbing leaks are to be
fixed promptly.                    Structure designed.
                                                                         Sprinkler systems to be prevented
                                                                         from significantly wetting up the
                                                                         foundation soils - best if watering
                                                                         is light & even around structure.

Ground level


                           Foundation soils.
                                                                                           2 metres.


      2.5 metres                                                          2.5 metres


The ground surface must be graded to slope away
from the perimeter of the structure & the owner/occupier
must not change the grade of the ground surface.




Maintenance of gutters, taps & plumbing & sprinkling control – H Reactivity Soils.




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