We have recently created a demonstration home as part of the BRE Innovation Park at Watford which has been adapted to beÂ resistantÂ to flooding from water up to 600mm deep, and also to beÂ resilientÂ to the effects of being flooded beyond that â€“ in other words, it is designed to dry out quickly and be suitable to move back into in a very short time after a flood incident.
At present, following a flood, builders repairing a flood-damaged home would strip off soggy plasterboard, take out the flooring and rip out a saturated chipboard kitchen. But, once the house has dried out, then theyâ€™d very likely put plasterboard back in, install a new chipboard kitchen, and use non-water resistant flooring and insulation materials, which, if the home were to flood again in the future, will suffer the same fate.
The BRE Flood Resilient Repair Home aims to show alternative replacement products in the repairs that will not be affected by subsequent flooding; products that are resilient. It also shows how simple measures such as placing electrical outlets higher up walls and using doors and windows with flood resisting seals can help minimise future damage. And, if water does get in, an automatic ‘sump pump’ connected to drains in the floor quickly gets water out of the house again.
Although the house is designed to be water resisting and resilient, it still looks and feels ‘homely’. See some of the measures installed from this slideshow:
Resistant and resilient measures used in the house include:
- Water resistant insulation in the walls and under the floor (such as spray-applied PUR foam or injected foamed cavity insulation)
- Kitchen units and doors made from resin-bonded board, and fitted with all-ceramic worktops
- Waterproof magnesium oxide wall boards instead of plasterboard, or, if plasterboard is used, this fitted horizontally so that in future only the lower boards need replacement if damaged
ceramic tiled floor and loose rugs in place of fitted carpets.
As well as these measures, other things have been done to keep vulnerable items out of the way of any future flood water:
- Sockets and switches placed higher up the wall, and the wiring to them all coming from the ceiling
- Appliances in the kitchen (fridge, oven, washing machine etc) mounted at worktop height
- The lower kitchen cupboards fitted with slide-out baskets so that they can be taken out and placed on the worktop if flooding is imminent
To prevent flooding entering the property by seepage from under the floor (which happens as groundwater rises, even if floodwater doesnâ€™t reach the door)
- Membranes installed under the floor and in the walls* to divert water towardsâ€¦
- Drain channels beneath the floor around the perimeter of the room, directing water intoâ€¦
- A sump in the corner of the home fitted with automatic pumps to remove the water, pumping it outside, before it can reach up to the floor.
- (*the membrane in the wall means that if the adjoining property floods, water that seeps through the wall from next door is channelled away to prevent damage on your side. This allows repairs to start even if the neighbouring property is still affected.)
And finally, to stem the flow of any flooding that reaches above the door sill level:
- Enhanced seals and locks to the doors and windows to make them floodproof
- Air brick covers
- One-way valves in the main drains to prevent water coming up into the home via the sewers.
- Drains fitted flush with the floor connected direct to the sump and pump (and so independent from the ‘mains drainage’), can rapidly clear any flooding that does get into the home, pumping it out above the external floodwater level.
Building flood resilience into the fabric of Britain
Read the blog below from Chair of the Environment Agency, Emma Howard Boyd, and chair of the The property flood resilience action plan, former BRE Chief Executive Peter Bonfield:
Our climate is changing.
We are seeing more extreme weather events which could lead to increases in heavy rainfall and significantly increased risks from river and surface water flooding.
A growing population means more houses, which means more people will be at risk.
read on… (at .gov.uk)
As seen on BBC Countryfile
For the filming forÂ BBC Countryfile (broadcast in 2017), several thousand litres of water poured into the home. Although this only created a shallow ‘flood’, this would have caused severe damage to most homes, and taken days or weeks to properly dry out. Here, just an hour after filming was completed, the water had all been removed via the floor drains and sump pump, the floor was dry and you would not have known that the house had been flooded at all.
Sponsors and supporters of the project
Axa Insurance UK
Property Care Association
Natural Cement Distribution Ltd
British Damage Management Association
UK Government department responsible for flood risk
The Environment Agency
UK Flood Barriers
Association of British Insurers