Yaseen Parkar BSc(Hons) ICIOB

Senior Design Manager

 

Willmott Dixon Housing Limited

 

Hitchin Road

Shefford

Bedfordshire

SG17 5JS

 

Tel: 01462 814455

Fax: 01462 816853

Mob: 07792 567840

 

 

 

             

 

 

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Willmott Dixon Housing Limited

Registered Office Spirella 2, Icknield Way, Letchworth Garden City, Hertfordshire, SG6 4GY

Registered Number 01176322 (England)

Yaseen,

 

Can you confirm that you have received my email and who the person is that will be responding to my query please?

 

Regards

 

 

Yaseen,

 

The applicant for this scheme is Nick Foyle, but I understand that he is no longer working for Willmott Dixon so I am sending this email to yourself instead.

 

I have received the following comments from my landscaping colleagues with regard to the green roof details:

 

• The proposal for a simple Sedum blanket is not considered sufficient to provide a high level of ecological value and is generally considered the most basic type of green roof. Sections 5.12/5.13 of the original Design and Access Statement states that bio diverse planting will be incorporated within the green roof design (including wildflowers/grasses).
• The original scheme also identified an area of brown roof on one of the blocks. The details for the design of this are not included in the AOD submission and brown roofs are not mentioned.
• The concept was fro green roofs on roofs which were overlooked and brown roofs on the roofs which were not overlooked.
• Generally, the Council’s advice for bio diverse roofs is that they should have a substrate depth varying between 80mm and 150mm with peaks and troughs, but should average at least 130mm. The design and planting scheme should be informed by a site biodiversity assessment and reflect the local conditions and species of interest. Extensive living roofs should be planted with 16 plugs per m2 (incorporating wildflowers and grasses).
• Detailed, site specific, long term (i.e. 10 year) maintenance plans will also be required.
• As it stands, the proposal by virtue of lack of detail for the brown roof and insufficient ecological diversity of the green roof is considered contrary to policies CS15, DP22, London Plan Policies 5.10, 5.11 and 7.19, and NPPF section 11.

 

Please note that paragraph 6.60 of my committee report for the main application states the following:

“Green roofs are proposed on the Chester Road Block and the Balmore Street Block and a brown roof is proposed on the Raydon Street Block.  Green walls are also proposed in the form of pre planted ivy panels.   The applicants have not specified what form the green and brown roofs will take. Sedum blankets on this site are not considered sufficient to provide the level of biodiversity required. Green/brown roofs should provide a high level of biodiversity and should have a substrate depth of at least 100mm into which vegetation can be planted or meadows sown. This will also aid in the sustainable drainage of the site. The applicants have agreed to such a design approach, subject to structural and other constraints, and details should be reserved by condition. It is noted that any potential increase in roof height to accommodate a more biodiverse green roof here would be minimal and would not affect the overall bulk and appearance of the block or scheme.”

 

The materials samples are considered acceptable.

 

If you would like to withdraw the green roof element from this proposal I can continue to assess the proposed materials and a decision notice should be sent by the end of the week.  This will then allow you time to amend the green roof proposals and to resubmit them in a separate application.  Can you let me know by the end of the week whether you wish to withdraw the green roof element from this application?

 

Regards