MCU14/0024 - Response to Information Request - Attachment 4

 

Where it is necessary to construct construction joints to meet the articulation requirements, they can be placed in places of limited visi
For example behind downpipes. Internal masonry walls should be articulated where they abut the perimeter walls.

 

The designer of the building must also ensure that articulation is established:
4. Adjacent to a change in floor level which exceeds 400 mm.

2. if any proposed extension abuts any existing structure, full height articulation must be established where the new masonry joins the
old.
3. Where a masonry wall transgresses from one footing type to another - eg from a perimeter footing to a continuous footing.

If the building has any masonry arches we must be contacted for further advice.

Methods of articulation are well documented in “Technical Note 61” by the Cement & Concrete Association.

D RECOMMENDATIONS

D.1. Recommendations for Builders

Codes of Practice: All construction work associated with this report must be undertaken in accordance with the BCA “part 3.1 — Site
Preparation” and “part 3.2 - Footings & Slabs” and AS2870-2011 “Residential Stabs and Footings’.

 

Underground Services/Piumbing: Where structures are built over filled, soft or loose soils, services will need to be supported so that
potential movement within the soils does not cause them damage or cause incorrect alignment which could cause leakage. Such measures
can include but are not limited to the pro in of expansion joints, sleeved or foam lagged pipe penetrations throughout the structure or
treatment of the soils prior to construction. The attached illustrations detail minimum requirements.

 

 
 

Arrange plumbing fixtures so that the slab and beam penetrations are kept to a minimum and where necessary sleeved to allow for
movement with 40mm thick closed cell polythene or similar material. Where the penetration is within 150mm of the base of a beam or
footing, the depth of this footing element should be deepened by approximately twice the diameter of the penetration. All plumbing and
drainage must comply with the requirements of the National Piumbing and Drainage Code AS3500.

For Class H & E sites, AS2870 - 2011 requires that plumbing
its and foam lagged penetrations.

 

es servicing dwellings in class H & E sites be fitted with sleeved expan:

 

 

Refer to the attached detail sheet “Plumbing Requirements Class M, H and E sites.

  

Site Drainage - Class A Sites: The ground surrounding the dwelling and the building site must be graded and drained so that stormwater
is shed away from the house area in all directions during and after construction. Particular attention should be given to all drainage so
stormwater is not introduced to the foundation soils leading to potential scour. Roof water must be diverted away from the building prior to
and after the roof is installed. Correct drainage is an essential part of our recommendations and design. If the site is not prepared correctly,
excessive foundation movements may occur leading to damage within the supported structure.

 
 

Site Drainage - Class S, M, H & E Sites: The ground surrounding the dwelling and the building site must be graded and drained so that
stormwater is shed away from the house area in all directions, during and after construction. A minimum grade of 1 : 20 (vertical :
horizontal) for 1.5m must be provided. Hard landscaping such as terrace siabs adjacent the dwelling can assist in this. Roof water must be
diverted away from the building site prior to and after the roof is installed. Where building delays occur, temporary downpipes may be
necessary. Constant maintenance of roof drainage is essen If a rainwater tank (or similar) is to be sited in 6 meters of a structural
footing, we should be consulted for further advice. External water taps, air conditioner overflows, tank and hot water cylinder overflows
should be over grated pits connected to the drainage system. The ground surrounding the building must be graded and drained so water is
shed away from the house in all directions.

 
  
 
 

 

Particular care should be taken with drainage, plumbing and electrical trenches so that they do not introduce water to the foundation si
not allow greater soil moisture evaporation and/or destabilise the footings by undermining them. The base of any trenches under the floor or
within 1.5 meters of the building should be sloped away from the house and should be backfilled with compacted clay plug.

 
 

Correct drainage is an essential part of our recommendations and design and is documented in the CSIRO handout BTF-18 attached to the
clients copy of this report. (Additional copies available upon request.) If the site is not prepared correctly, excessive soil moisture may
occur in some areas, which can lead to excessive foundation movements possibly damaging the supported structure.

 

Bracing for Wind Forces: Unless noted, we do not detail slab thickenings or pad footings to conform to wind bracing. Where a bracing
wall is to be bolted to a slab, 40mm bottom concrete cover attained for a radius of 150mm is required around the bolts unless noted by other
consultants.

Inspections: We require 24 hours notice if you require engineers site inspections. Inspections can be booked between 8.30am and 4.30pm
Monday to Friday by telephoning 07 5455 5604.

le for ensuring appropriate silt retention measures are in placed and maintained throughout

 

Silt Retention: The builder is respon
construction.

Site Classification: The site classification is calculated in accordance with the “AS2870-2011 - Residential Slabs and Footings-
Construction” and relates to the estimation of Ys, “The characteristic surface movement” within reactive soil profiles. The limits used for this
classification are as follows:

 

 

 

 

 

 

 

Predicted Surface Movement Classification

Ys = <=20mm Ss Slight

Ys = >20 - 40mm M Moderate
Ys = >40 - 60mm H1 High-1
Ys = 60 - 75mm H2 High-2

Ys => 75mm E Extreme
Problem sites iD Problem

 

 

 

 

scG Consulting Engineers Appendix Page 4o0f7 Appendices.1