Skip to site navigation

Accessibility Options

Font size

Colour scheme

Sandbags

 
Sandbags are one of the most well-known devices for keeping floodwater out of your property.

  • Unfilled sandbags and a supply of sand can be purchased from some DIY stores and Builders Merchants, but remember if there is a flood in your area demand may exceed supply as people rush to buy them. The Council may be able to supply some sandbags in an emergency, but they will have a limited supply.

  • If you have not purchased sandbags and sand in advance, you can use alternatives such as pillow cases or refuse sacks and fill them with garden soil.

How to fill and position sandbags

  • Unless you have access to a sandbag filling machine, this is a two person job: one to hold the bag and one to fill.

  • Sand is abrasive - both people should wear protective gloves.

  • Do not fill bags more than half full. Remember that they can get heavy quickly, so do not over fill, or fill them too far away from where you need to position them.

  • It is not necessary to tie the end of the bags.

  • Remove any debris from the area where the bags are to be placed.

  • Place the half filled bags lengthways and parallel to the direction of the water flow. Tuck the opened end under the filled half of the bag and position it pointing into the water flow.

  • Place bags in layers. Like a brick wall, make sure that in the next layer each bag overlaps the one below by half.

  • Stamp bags firmly into place to eliminate gaps and create a tight seal.

Pyramid placement method

If you need to create a sandbag protection that is more than three layers high you will need to build in a pyramid style. For the structure to be stable, you should build the ‘sandbag wall’ three times as wide as you need it to be high. It will also be more effective if you alternate the layers lengthways and crosswise. Stamp each bag in place and tuck the loose end firmly under the filled portion of the bag.

Additional waterproofing

Lay plastic sheeting across the side of the ‘sandbag wall’ that will face the floodwater. Weigh down with additional sandbags.

A to Z of Services

About Greenwich

Floodline

  • 0845 988 1188

Useful links