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Rock Street, San Francisco

Wall ties

No wall ties are specified in this submission. A section
through the cavity wall must be given. The section through must show clear
evidence of the wall ties having horizontal spacing of 900mm and a vertical
spacing of 450mm, or alternatively, that the number of wall ties per square
meter is not less than 2.5 ties/m2. (Approved Document A, Structure,
Page 14) Wall ties should be provided spaced not more than 300mm apart
vertically, within a distance of 225mm from the vertical edges of all openings,
movement joints and rood verges. (Approved Document A, Structure – Page 14)
Wall ties should comply with BS EN 845-1 and should be material references 1 or
3 in BS EN 845-1 table A1 austenitic stainless steel. (Approved document A,
Structure, Page 18). As the cavity is 100mm the wall tie length should be 225mm
(Approved Document A- Structure, Page 23).

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Wall ties are crucial to the structural stability of a
building. A wall would not be able to stand straight without cavity wall ties,
hence why evidence must be shown in the form of a section through the cavity
wall giving evidence of each wall tie and the correct spacing between them.

Foundations

No details regarding foundations are supplied within these
submitted plans. Compliance of Section 2E would include a scale drawing of the
buildings foundations. This would provide information to ensure that the
building was structurally solid. Within this drawing, the ground levels should
be provided. As this building has cavity walls, the ground supported floor slab
should be less than or equal to 1m and less than or equal to 4 x 200 or 4 x 300
depending on the concrete fill to the wall cavity (Approved Document A –
Structure, page 26). The design provisions (2E2) listed below should be clearly
recognised in the foundation scale drawing: –

a.    
The wall should be central to the foundations
below.

(Approved Document A: Structure, page 36)

b.    
The type of concrete used in conjunction to the
type of soil.  Chemically aggressive soil
conditions should follow guidance in BS 8500-1 and BRE Special Digest 1.
Whereas non-aggressive soil types composed of Portland cement should follow BS
EN 197-1, BS EN 197-2 and BS EN 12620.

(Approved Document A: Structure, page 36)

c.    
The thickness of the concrete foundation.
Diagram 23 and Table 10 in Approved document A: Structure should be used as a
reference here.

(Approved Document A: Structure, page 36)

d.    
If foundations are stepped the overlap should be
no more than 300mm. Or, foundations stepped on elevation should overlap by
twice the height of the step, by the thickness of the foundation.

(Approved Document A: Structure, page 36)

e.    
Stepped foundations should be no higher than the
thickness of the foundation.

(Approved Document A: Structure, page 36)

f.     
If a stripped foundation is used, Table 10 may
be used as reference for the recommended widths. While the minimum depth of a
strip foundation should be 0.45m to avoid the action of frost.

(Approved Document A: Structure, page 36)

Imposed loads

No indication of
‘imposed loads’ for the building has been provided. Loading calculations must
be provided and the loads must follow the recommended guidelines in the building
regulations. As the roof is not exceeding 12m the distributed loads should be
no more than 1.00kN/m2 (Approved Document A, Structure, page 18).
The distributed load to the floor should be no more than 2.00kN/m2
(Approved Document A, Structure, page 18). And for ceilings the distributed
load should allow 0.25kN/m2 along with a concentrated load of 0.9kN.
(Approved Document A, Structure, page 18)

Masonry units

The type of brick
used should be provided, as different types of brick require different specifications,
(Approved Document A – Structure, page 18) and different materials have
different compressive strengths (Approved Document A – Structure, page 23).

Wind speeds

Location of the
building along with the maximum height of the building relating to wind speed
should be provided with reference to Diagram 7 in the Building Regulations
Approved Document A – Structure. This will in hindsight provide enough
information to ensure that the building can resist the locations maximum wind
speed.

Lateral support for walls

As this building has
walls greater than 3m, the cavity walls must have floor lateral support by
every floor forming a junction with the supported wall (Approved Document A –
Structure, page 29) This can be provided with the foundations drawing. A 30x5mm-galvanised
mild steel of at least 1200mm long must be used with a 2m max spacing between
each support beam. Noggins must also be shown with a minimum of 38mm width to
extend at least ½ the depth of the joist (Approved Document A – Structure, page
30). The gable walls should be strapped to the roof by vertical tension straps
spanning at least 1m in length (Approved Document A – Structure, page 30).

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