To lower risk of snow putting too much stress on a building roof, the EMA advises:

* Stay alert for large snow build-up or snowdrifts on your roofs.

* If roof snow can be removed by using a snow rake, available at most hardware stores, do so. But use caution becayse metal snow rakes conduct electricity if they make contact with a power line.

* Try to avoid working from ladders because ladder rungs tend to ice up. Snow and ice accumulate on boot soles and metal ladders.

* Flat roofs can be shoveled clear, but only if it is determined that the roof is safe to stand upon. Exercise care when on the roof to avoid potentially dangerous falls.

* Flat roof drainage systems should be kept clear to minimize the risk of excess roof ponding in the event of subsequent heavy rainfall or melting.

* Large icicles can form on roof overhangs, but do not necessarily mean ice damming is occurring. Icicles overhanging doorways and walkways can be dangerous and should be carefully removed.

All of the above steps should be done onyl by able-bodied adults, the EMA said, because snow is heavy,and roofs and other surfaces may be slippery. And the actions should only be performed in properly lighted environments. Protective headgear and eye protection is also recommended.