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23rd November 2015
Mr and Mrs Oxley The Garth Pasture Road Embsay Skipton BD23 6RQ
Dear Sirs,
15021, The Garth, Pasture Road, Embsay
Further to my recent site visit and design calculations for the existing and proposed basements, I have the following comments to make with regard to the existing basement and the associated works converting it to a habitable room.
The site investigation indicated water ingress into the existing basement which was ponding in places and causing general damp staining to the walls. It is likely that this water ingress is due to the significant ground level difference between the front and rear of the property and the lack of any tanking system allowing water to ingress into the basement.
Although the property is not exhibiting any significant signs of movement, it is recommended that a tanking system is installed into the existing basement which will help prevent further water ingress and allow the ground water flow to be diverted away from the existing foundations.
Whilst it may be preferable to retain the existing stone slab flooring, technically it will be far easier and a superior solution if the stone slabs are removed, new tanking and structural sub floor installed and floor reinstated.
Please find attached our design suggestions for lowering the floor slab and increasing the useable floor area.
Yours Faithfully,
Iain Russell BEng CEng MICE Structural Engineer
Iain Russell Consulting Chartered Engineer * Civil and Structural
Design m:07766 404469 e:[email protected]
Iain Russell BEng CEng MICE 17 Dewhirst Street Wilsden Bingley, West Yorkshire BD15 OJB
Iain Russell Consulting Chartered Engineer * Civil and Structural Design Iain Russell BEng CEng MICE Wilsden, Bingley, West Yorkshire m:07766 404469 e:[email protected]
Structural Calculations
For the remedial foundation boot
To the existing basement
At
The Garth, Pasture Road, Embsay
18th March 2015
The Garth, Pasture Road, Embsay Structural Calculations 18.03.15 Job: 15021
Introduction The client has requested structural calculations and sketches in support of the building regulations application and works on site. Scope of Works The proposed works are to comprise lowering the existing basement floor level, exposing the side of the foundation. To mitigate this excavation, it is proposed to incorporate a boot upstand into the ground bearing floor slab to retain the fill and resist any surcharge to the base of the wall. Design Parameters The proposed surcharge from the foundations is to be based on a SBP of 100kn/m2 taken up to full capacity on a 750mm wide footing. Design Philosophy Outline Structural Philosophy
The concrete upstand is to be designed to withstand the surcharge from the existing house wall and roof structure plus the additional surcharge from external pedestrian loading and earth pressure.
The walls are founded on a stiff clay which can adequately support the existing loads.
The Garth, Pasture Road, Embsay Structural Calculations 18.03.15 Job: 15021
Design Standards The building and associated works will be designed in accordance with the latest editions of the relevant British Standards and Codes of Practice as listed and as appropriate to the form of construction used but not limited to: BS 648:1964 Schedule of weights of building materials BS8110: Part 1: 2000 Structural use of concrete BS6399: Part 1: 1996 Loading for buildings Code of Practice for dead and imposed loads BS6399: Part 3: 1988 Loading for buildings Code of Practice for imposed roof loads
Iain Russell Consulting Chartered Engineer * Civil and Structural Design Iain Russell BEng CEng MICE Wilsden, Bingley, West Yorkshire m:07766 404469 e:[email protected]
Structural Calculations
Excavations and retaining walls
To form new basement
At
The Garth, Pasture Road, Embsay
22nd April 2015
The Garth, Pasture Road, Embsay Structural Calculations 22.04.15 Job: 15021
Introduction The client has requested structural calculations and sketches in support of the building regulations application and works on site. Scope of Works The proposed works are to comprise excavation of an existing sub floor to form a new basement with the provision of internal retaining walls to support the existing footings and retain the external fill. Design Parameters The proposed surcharge from the existing foundation is to be taken as a horizontal load against the retaining wall. Design Philosophy Outline Structural Philosophy
The retaining wall is to be designed to withstand the surcharge from the existing house wall and roof structure plus the additional surcharge from external pedestrian or vehicular loading and earth pressure.
The walls are founded on a stiff clay which can adequately support the existing loads.
An additional steel beam is to span between the retaining walls to
support an existing internal wall.
The Garth, Pasture Road, Embsay Structural Calculations 22.04.15 Job: 15021
Design Standards The building and associated works will be designed in accordance with the latest editions of the relevant British Standards and Codes of Practice as listed and as appropriate to the form of construction used but not limited to: BS 648:1964 Schedule of weights of building materials BS8110: Part 1: 2000 Structural use of concrete BS5950: Part 1: 2000 Structural use of steelwork BS8002: 1994 BS6399: Part 1: 1996 Loading for buildings Code of Practice for dead and imposed loads BS6399: Part 3: 1988 Loading for buildings Code of Practice for imposed roof loads
Designers Risk Assessment 15021: The Garth, Embsay
Iain Russell Consulting Chartered Engineer * Civil and Structural Design
No Hazard Who does it affect Control measures or design changes Action by
1 Gaining access for the works in a residential property area
Public, client and contractor
The contractor is to make provision to inform adjacent residents of any large or potentially unstable deliveries, such as proposed steelwork, and to monitor movement of vehicles and plant to prevent damage adjacent property and potential collisions with the public.
Contractor
2 Steelwork installation Client and Contractor
The contractor is to ensure that any load bearing walls are propped prior to installation of steelwork and all steelwork fully packed and loaded prior to prop removal.
Contractor
3 Lifting structural steelwork
Contractor
The contractor is to ensure that any crane used to transfer steelwork is of sufficient capacity. The contractor is to advise if the steelwork as designed is of a practical length for manhandling.
Contractor
4 Padstones Contractor Existing masonry to be broken out for the installation of new padstones, due care to be taken to protect the integrity of the existing structure.
Contractor
5 Excavations Contractor
The contractor is to review the excavation phasing drawing and confirm they consider it acceptable to accommodate the expected ground conditions. The contractor is to submit a method statement for the proposed works, including any temporary works, to ensure the integrity of the building
Contractor
