Norfolk Bat Brick
Frost-free clay bricks known for attracting 1 to 3 bats per brick when placed in tunnels, cellars, and bat houses.
For an alternative option, check out the Schwegler 1FE Bat Access Panel we have available.
If you want to support crevice dwelling bats in tunnels, cellars, and bat houses, these natural clay bricks are designed to provide entry into a cavity as they are sealed across the back.
The first prototype of the Norfolk bat brick was designed in 1984 to aid in overcoming a shortage of hibernation crevices for bats in suitable habitats. Since then the design has been carefully optimised to maximise the effectiveness of the brick for attracting and protecting crevice hibernating species.
- History of being deployed with success
- Commonly attracts 1 to 3 bats per brick
- Ideal for dark, damp places with little disturbance
- Can be used to repair existing brick structures
- Can be built into the concrete facings
- Kiln fired so that they are frost-proof
Why do we need to protect bats?
Bats play an important role within our environment. As well as performing some pollination, bats are a natural control of insect populations as these are their main food source. Bats are also a good indicator species of environmental health, with changes in populations reflecting local biodiversity.
Bats are a schedule 1 protected species under the Wildlife & Countryside Act. It is illegal for any member of the public to disturb a roost, handle or kill any bat. Bat boxes therefore may only be inspected by a licensed bat worker. However, you can monitor your bat box without disturbance, look for mouse-sized droppings beneath the box as a clue to occupation or observe from a distance at dusk to see if bats are exiting the box to hunt.
MATERIAL: Absorbent clay, roughened with sand and fired to about 1100ºC to make them frost-proof.
DIMENSIONS (MM): 200 x 100 x 70
SPECIES: They have a series of slits of the correct size for Daubenton's, Natterer's, Brown Long-eared, Brandts, Whiskered, and Barbastelle to hide in.
SITING: These bricks would typically be used to replace an existing perhaps crumbling brick in a brick-built vaulted tunnel. The old brick should be carefully removed using a grinder, drill, or cold chisel, taking proper safety precautions, then inserting the bat brick using an appropriate mortar (e.g. a soft lime mortar for old brickwork, or 6:1 sand:cement for modern brickwork). Modern resin-based mortars can be used, but they should be used sparingly, only in the summer when no bats are present, with extra ventilation and so placed to provide a water-soluble 'wick' with the original substrate.
Prop the brick in place with a length of timber or an "Acro-prop" for a day or so until set, then carefully point up around any gaps. They are NOT 'entry bricks', neither were they designed to be used facing into the cavity wall of modern houses, and are considered unlikely to be used by bats in this situation.
In existing concrete tunnels or sites where it is considered difficult or undesirable to excavate or damage the existing surfaces, then a surface attachment is acceptable, though may not give quite such good results. Embedding the bricks
into the concrete roof of a new tunnel also works well. Simply place the bat brick on the surface of the shuttering ply, having first filled all the holes with sharp sand or grit, allowing a little to spill out when placed. This stops wet concrete from entering the holes and gives a rough gripping area around each bat brick after the shuttering is removed. Do seek the advice of a structural engineer before doing this, as these units may influence the structural integrity of a cast concrete tunnel roof.
MAINTENANCE: Can be very easily checked using a torch. Cleaning is not necessary (self-cleaning).
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