GBS N80 110A Cambridge Swift Box (RSW)
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N80 Biodiversity Enhancement/Adaptation/Mitigation Systems
Draft Specification awaiting review (A07 BRM 261116)
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Manufacturer’s Illustrations:
N80/110A Concealed concrete cantilevered swift nest box block:
N80/110B Concrete swift nest entrance brick stretcher
N80/110C Concrete swift nest entrance brick header
Consider adding 3rd drawing
The brick header entrance brick is half the length of the stretcher (the half with the hole!)
GBE Guidance Notes:
In addition to choosing a competent, appropriate location and orientation for the bird box to suit the occupant and their nesting habits, also take into account structural issues as noted below:
Building competent locations:
Above the U value envelop:
- above occupied rooms and their enveloping insulation,
- in gable walls of building with storage attics not room in roof accommodation
In the absence of information on concrete mix strength and box configuration strength, it is recommended to avoid load-bearing situations in buildings.
Unsuitable load-bearing situations include:
- Immediately below the eaves wall plate
- Below a cut timber roof’s loadbearing purlin, loadbearing ridge or eaves wall plate
Suitable situations might include:
- Non-loadbearing walls
- Below a suitably designed and sized lintel
- Where the project Structural Engineer permits
- Where the Building Control Officer permits
- In an unloaded gable wall of a trussed rafter roof
GBE Critique of System
N80/110D Concrete concealed bird nest box & exposed entrance brick system in gable wall:
For
- Domestic or Non-domestic buildings
- Tough, durable, low maintenance,
- Bats and/or birds accommodated
- Roosts can be positioned on any elevation unobtrusively
- Potentially large capacity roots/nests
- High thermal mass
- Made for uninsulated cavity walls above the U value envelop
To be considered
- Limited access for cleaning and removal of faeces and nesting materials from box
N80/110E Concrete concealed bird nest box & exposed entrance brick system at eaves:
For
- Domestic or Non-domestic buildings
- Tough, durable, low maintenance,
- Bats and/or birds accommodated
- Roosts can be positioned on any elevation unobtrusively
- Potentially large capacity roots/nests
- High thermal mass
- Made for uninsulated cavity walls above the U value envelop
To be considered
- Creates thermal break through inner leaf insulating around box makes the installation less stable
- Causes thermal bridge through cavity wall construction
- Reduces U value locally in cavity wall construction with cavity insulation
- Could be used in blockwork but does not coordinate with blockwork if insulated around box
- Limited access for cleaning and removal of faeces and nesting materials from box
GBE Robust Specification
N80 BIODIVERSITY ENHANCEMENT/ADAPTATION/MITIGATION SYSTEMS
To be read with Preliminaries A10-A55/General Conditions
110A CONCEALED CONCRETE CANTILEVERED SWIFT NEST BOX BLOCK:
- Reference Drawing(s): Cambridge Swift Box Maxi Block PD000248
- Type: Hollow block with open front and 2 No. cast in nest dishes in top and bottom (avoids error in installation)
- Manufacturer: CJ WildBird Foods Ltd. The Rea, Upton Magna, Shrewsbury, Shropshire, SY4 4UR
- T 0044 (0)1743 708022 F 0044 (0)1743 709505
- W www.birdfood.co.uk/pro W http://twitter.com/VivaraProUK
- Contact: Martin George Wildlife Specialist T General: 0044 (0)1743 709555
- E martin.george@birdfood.co.uk
- Product Reference: Cambridge Swift Nest Box
- Endorsement: [GBE Listed]
- LCA/EPD: Not Available
- Density: 2400 kg/m3 Michael McNulty to calculate
- Box weight: [___/___] kg
- Work sizes: 440 x [200/250] x 215 (l x d x h) mm.
- Wall thickness: 25 mm. (20 mm. in nest dishes)
- Nest dishes: 5 x 90 mm. diameter
- Material: Concrete OPC and primary virgin aggregates 1-2mm sand, 2 – 5mm coarse sand or 5mm + gravel
- Finish: Fine textured finish
- Colour: Grey
110B CONCRETE SWIFT NEST ENTRANCE BRICK STRETCHER
- Reference Drawing(s): Cambridge Swift Box Full face brick PD000361
- Type: Solid Brick with cast in opening front to back through 102.5 mm
- Manufacturer: CJ WildBird Foods Ltd. The Rea, Upton Magna, Shrewsbury, Shropshire, SY4 4UR
- T 0044 (0)1743 708022 F 0044 (0)1743 709505
- W www.birdfood.co.uk/pro W http://twitter.com/VivaraProUK
- Contact: Martin George Wildlife Specialist T General: 0044 (0)1743 709555
- E martin.george@birdfood.co.uk
- Product Reference: Cambridge 1 Brick Swift Nest Entrance
- Endorsement: GBE Listed
- LCA/EPD: Not Available
- Density: 2400 kg/m3 Michael McNulty to calculate
- Brick weight: ____ kg
- Work sizes: 215 x 102.5 x 65 (l x d x h) mm.
- Wall thickness: 15-17 mm.
- Material: Concrete OPC and primary virgin aggregates 1-2mm sand, 2 – 5mm coarse sand or 5mm + gravel
- Finish: Fine textured finish
- Colour: Grey
110C CONCRETE SWIFT NEST ENTRANCE BRICK HEADER
- Reference Drawing(s): Cambridge Swift box Half face Brick Reference number
- Type: Solid Brick with cast in opening front to back through 102.5 mm (full width brick)
- Manufacturer: CJ WildBird Foods Ltd. The Rea, Upton Magna, Shrewsbury, Shropshire, SY4 4UR
- T 0044 (0)1743 708022 F 0044 (0)1743 709505
- W www.birdfood.co.uk/pro W http://twitter.com/VivaraProUK
- Contact: Martin George Wildlife Specialist
- E martin.george@birdfood.co.uk T General: 0044 (0)1743 709555
- Product Reference: Cambridge Half Brick Swift Nest Entrance
- Endorsement: GBE Listed
- LCA/EPD: Not Available
- Density: 2400 kg/m3 Michael McNulty to calculate
- Brick weight: ____ kg
- Work sizes: 102 x 102.5 x 65 (l x d x h) mm half width brick
- Wall thickness: 15-19 mm.
- Material: Concrete OPC and primary virgin aggregates 1- 2mm sand, 2 – 5mm coarse sand or 5mm + gravel
- Finish: Fine textured finish
- Colour: [Grey/Duchy Red]
110D CONCRETE CONCEALED BIRD NEST BOX & EXPOSED ENTRANCE BRICK SYSTEM IN GABLE WALL:
- Reference Drawing(s): Cambridge Swift Box Midi
- Location: Gable wall of trussed rafter pitched roof above insulated accommodation
- Surround: Masonry Cavity wall, Brick outer leaf, Blockwork inner leaf
- Cavity:
- Total cavity: [150/200] mm.
- Partial fill cavity Insulation thickness: [100/150] mm.
- Residual cavity: 50 mm.
- Orientation:
- South-West for nursery roosts
- North for winter hibernation roosts
- Roof configuration:
- Pitched trussed raftered roof gable walls at high level close to ridge
- Pitched trussed raftered roof gable walls above external wall/internal ceiling insulation thickness
- Manufacturer: CJ WildBird Foods Ltd. The Rea, Upton Magna, Shrewsbury, Shropshire, SY4 4UR
- T 0044 (0)1743 708022 F 0044 (0)1743 709505
- W www.birdfood.co.uk/pro W http://twitter.com/VivaraProUK
- Contact: Martin George Wildlife Specialist
- E martin.george@birdfood.co.uk T General: 0044 (0)1743 709555
- Product Reference: Cambridge Swift Nest System
- Consisting of:
- Concealed concrete cantilevered swift nest box block to N80/110A
- [Concrete Swift Nest Entrance Brick Stretcher to N80/110B
- Concrete Swift Nest Entrance Brick Header to N80/110C]
- Size: Whole brick and block sizes with no cutting and no waste
- Preparation: ensure the top of the partial cavity wall insulation is protected by cavity tray DPC
- Installation:
- Build swift nest box into full thickness of inner leaf replacing a whole block,
- Cantilever across the cavity to contact with the inner face of the outer leaf brickwork
- Build swift nest entrance brick into [full/partial] thickness of outer leaf replacing brick [stretcher/header]
- Mortar: Matching mortar to BS 5628
- Coloured mortar: [Grey/colour to suit]
- Joint Profile: [Flush/recessed/bucket handle]
- Seal internal corner between outer face of swift nest box and inner face of outer brick leaf
- Sealant: Material: Compatible with cavity tray DPC over box, setting type, [_____]
- Sealant application: to all 4 faces of nest box
- Clean both joint surfaces, all round
- Apply compatible primer to adjacent surfaces
- Apply sealant between two adjacent primed faces
- Maintain convex sealant profile
- Install Cavity Tray DPC above the box block and the entrance brick
- Other requirements: Clean up upon completion remove any debris from top of cavity wall insulation beside and below.
110E CONCRETE CONCEALED BIRD NEST BOX & EXPOSED ENTRANCE BRICK SYSTEM AT EAVES:
- Reference Drawing(s): [________]
- Location: Eaves wall of pitched roof
- Surround: Masonary Cavity wall, Brick outer leaf, Blockwork inner leaf
- Cavity:
- Total cavity: [150/200] mm.
- Partial fill cavity Insulation thickness: [100/150] mm.
- Residual cavity: 50 mm.
- Orientation:
- South-West for nursery roosts
- North for winter hibernation roosts
- Roof configuration:
- Pitched roof eaves walls at high level close to eaves, but not immediately below wall plate
- Pitched roof eaves walls within external wall insulation thickness
- Manufacturer: CJ WildBird Foods Ltd. The Rea, Upton Magna, Shrewsbury, Shropshire, SY4 4UR
- T 0044 (0)1743 708022 F 0044 (0)1743 709505
- W www.birdfood.co.uk/pro W http://twitter.com/VivaraProUK
- Contact: Martin George Wildlife Specialist
- E martin.george@birdfood.co.uk T General: 0044 (0)1743 709555
- Product Reference: Cambridge Swift Nest System
- Consisting of:
- Concealed concrete cantilevered swift nest box block to N80/110A
- [Concrete Swift Nest Entrance Brick Stretcher to N80/110B
- Concrete Swift Nest Entrance Brick Header to N80/110C]
- Other requirements:
- Thermal insulation to maintain U value [behind/ and beside] box
- Material: [Aerogel/Vacuum Insulated Panel (VIP)]
- Thickness:
- 30 mm to rear face
- 30 mm to sides
- Insulation sizes:
- Back: 30 x 215 x 440 (t x h x l) mm
- Sides: 2 No. 30 x 100 x 215 (t x d x h) mm
- Top and Bottom: 2 No. 30 x 100 x 500 (t x d x w) mm
- Insulation installation:
- Allow for cutting blockwork to accommodate insulation, cut accurately and leave smooth surfaces
- Ensure there are no sharp edges if using VIP insulation
- Preparation:
- Ensure the top of the partial cavity wall insulation is protected by cavity tray DPC
- Modify box depth (250 mm) to accommodate thermal insulation
- Installation:
- [Build swift nest box into full thickness of inner leaf replacing a whole block,
- Build swift nest box into 70 mm thickness of inner leaf replacing a whole block
- Incorporate 30 mm. insulation all round]
- Cantilever across the cavity to contact with the inner face of the outer leaf brickwork
- Build swift nest entrance brick into [full/partial] thickness of outer leaf replacing brick [stretcher/header]
- Mortar: Matching mortar to BS 5628
- Coloured mortar: [Grey/colour to suit]
- Joint Profile: [Flush/recessed/bucket handle]
- Seal internal corner between outer face of swift nest box and inner face of outer brick leaf
- Sealant: Material: Compatible with cavity tray DPC over box, setting type, [_____]
- Sealant application: to all 4 faces of nest box
- Clean both joint surfaces, all round
- Apply compatible primer to adjacent surfaces
- Apply sealant between two adjacent primed faces
- Maintain convex sealant profile
- If the boxes are not protected by an eaves overhang then install Cavity Tray DPC above the box block and the entrance brick
- Other requirements: Clean up upon completion remove any debris from top of cavity wall insulation.
End or work section N80
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© 1985-2016 GBE NGS ASWS BrianSpecMan
GBS Revisions
| Revision No. | Description | Author | Date |
| A00 | For Preliminary Issue
Cut and pasted from literature and websites Edited to specification format Added Materials and Product critique Issue to CW @ BCT |
BRM | 08/08/2009
– 14/08/2009 |
| A01 | Updated during review of Draft 9 | BRM | 09/10/2009 |
| A02 | Update Roofblock spec | BRM | 16/09/2012 |
| A03 | Save as Separate file for CJWBF only
Added 110A-110E CJ WildBird Food Cambridge System clauses |
BRM | 26/08/2016 |
| A03 | Issue to MG at CJWBF for comment | BRM | 26/08/2016 |
| A04 %%% | Updated with email and telephone feedback (250mm into drawing & spec) | BRM | 21/11/2016 |
| A04 %%% | Added Guidance notes re positioning re loadbearing capacity | BRM | 21/11/2016 |
| A04 %%% | Added Page 1 Header, Logo, editing notes and T&C at end | BRM | 21/11/2016 |
| A04 %%% | Moved Critiques to page with Guidance notes | BRM | 21/11/2016 |
| A04 | Issue to MG, MMcN, PS @ CJWBF | BRM | 21/11/2016 |
| A05 | Feedback from PS at CJWBF | PS | 25/11/2016 |
| A06 %%% | Incorporated comments and edited accordingly, some still outstanding
moved guidance and critique forwards; Added illustrations |
BRM | 25/11/2016 |
| A06 %%% | 110A Next > Nest, WS title spelling adaptation, | BRM | 25/11/2016 |
| A06 | Issue to MG, MMcN, PS @ CJWBF | BRM | 25/11/2016 |
| Pending: | |||
| A06 | Concrete recipe to finalise
Concrete density or object weights to be calculated Duchy Red to be confirmed © Action for swift images; permission to be sought or replace? |
BRM | 25/11/2016 |
A07 © Action for swift images; deleted for publication BRM 26/11/2016
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© GBE GBC GRC GIC GGC GBL NGS ASWS Brian Murphy aka BrianSpecMan ******
21st November 2016 – 9th December 2024
See Also:
GBE Robust Specification
n80-cambridge-swiftboxspecclauses-a07brm261116 DOCX
n80-cambridge-swiftboxspecclauses-a07brm261116 PDF
Manufacturer’s Drawings
pd000248-cambridge-150-swift-nest-box-v2 PDF
pd000361-full-face-brick-v1-cambridge-drawing PDF
GBE Manufacturers:
- CJ WildBird Foods Ltd.
GBE Products:
- Cambridge Swift Nest Box
- Cambridge 1 Brick Swift Nest Entrance
- Cambridge Half Brick Swift Nest Entrance
GBE Systems:
- Cambridge Swift Nest System
GBE Suppliers:
- CJ WildBird Foods Ltd.
GBE Jargon Buster
- Themes
- Initials, Abbreviation Acronyms
- Classification
- N80 Biodiversity Enhancement/Adaptation/Mitigation Systems
- Words & Phrases
- Biodiversity
- Enhancement
- Adaptation
- Mitigation
GBE Checklist
- N80 Biodiversity Enhancement/Adaptation/Mitigation Systems
© GBE GBC GRC GIC GGC GBL NGS ASWS Brian Murphy aka BrianSpecMan ******
21st November 2016 – 9th December 2024
