GBS N80 110A Cambridge Swift Box RSW - Green Building Encyclopaedia

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GBS N80 110A Cambridge Swift Box (RSW)

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 3^rd 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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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	25/11/2015

A07 © Action for swift images; deleted for publication BRM 26/11/2016

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Addenda

NBS compatibility

National Building Specification (NBS) is the industry standard specification library.
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GBS N80 110A Cambridge Swift Box (RSW)
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
- Biodiversity
Initials, Abbreviation Acronyms
Classification
- N80 Biodiversity Enhancement/Adaptation/Mitigation Systems
Words & Phrases
- Biodiversity
- Enhancement
- Adaptation
- Mitigation

GBE Checklist

N80 Biodiversity Enhancement/Adaptation/Mitigation Systems

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