CONSTRUCTING ENVIRONMENTS A02: FULL SIZE ASSIGNMENT - SPANMAN
Tara Shokouhi 635693
TABLE OF CONTENTS Member Schedule
1.
Structure
4.
Materials
5.
Construction
6.
Aesthetic Design
7.
Function
8.
Photos of Models
9.
Diagrams, Details & Annotations
10.
Spanman Calculations
11.
APPENDIX (Certificate & Calculations)
12.
1. Main House Area 1.1 Ridge Beam between Rafters A & B 1.2 Rafter A 1.3 Rafter B 1.4 Rafter C 1.5 Roof Beam A 1.6 Roof Beam B
2. Bathroom Area 2.1Ridge Beam between Rafters A & B 2.2 Rafter A 2.3 Rafter B 3. Deck Area 3.1 Ridge Beam between Rafters A & B 3.2 Rafter A 3.3 Rafter B REFERENCES
MEMBER SCHEDULE
Page 1.
Page 2.
N.B. The numbers in brackets placed next to the ‘Member’ section of this table corresponds to its member label in the appendix. Please refer to Page 10 of this report, for further explanations and diagrams of these sections.
Page 3.
The primary structure of the roof designed, consists of linear rafters, ridge beams and roof beams, all constructed out of LVL F17 timber. To obtain the curved nature of the roof, timber roof battens of varying sizes will be used and will thus create a base shape for the moulded colour bond to be bolted to.
STRUCTURE
Figure 1
Figure 2
As per the design of the roof, the two curves will be divided by a wall-like structure with windows to allow to ventilation and light. This causes a problem as it is one of the significant stress points of the roof (Figure 1). With the weight of the roof being too much, this section will be supported by two roof beams and a support behind these roof beams, each sitting on existing beams (this is assumed from the architectural plans given). This will allow for the windows to be placed between (Figure 2). Page 4.
MATERIALS
1.
2.
1.
2.
3.
4.
5.
6.
- LVL F17 (Laminated Veneer Lumber) This type of timber best suited my structure and will thus be used for my entire roof structure, from the ridge beams, to the roof beams and rafters. This material is constructed of �multiple layers of thin timber binded with an adhesive� (Structural Timber, 2013) and is not only available in long lengths, but is also strong, much like the strength of F17 Hardwood. - Roof Battens Pieces of wood that provide the proper spacing for the colour bonding roof to be attached to. In the case of my roof, the battens will be of varying sizes to accommodate for the curved roof as my structure is linear.
3.
- Insulation Batts Used to insulate the house against heat and cold weather. Positioned between the colour bond roof and the rafters, alternating with the roof battens.
4.
-Insulation Sheets - Silver wrap Used on top or under the Insulation Batts, to help keep them in place. In my structure it will be used on top of the batts, as the batts itself are being placed on top of my primary structure. The reason for this is because the Insulation batts only work properly when they are not squished, and thus the ceiling battens would keep them in place and stop them from compressing under the above weight.
5.
- Colour Bond Roofing Flexible and can be ordered to any shape and colour, and the fact that they come in panels makes it easier to lay. It is also low maintenance, and light, therefore does not require too much support, such as is the problem with concrete roof tiles. This accommodates the curve of my roof.
6.
- Aluminum Windows Electric windows will be put in place between the two levels of the roof. These will allow for air flow and light in and out of the house. Page 5.
CONSTRUCTION
N.B. Sketches are NOT to scale
The roof structure will be constructed on top of the already existing load baring walls of the house. The primary structure and construction of the roof has altered from that of what was originally explored in the Interim submission. The change of structure was made to accommodate for Spanman and to simplify the model. To begin with, the large area of the house will have a Ridge Beam put in place, with rafters on either side. For the windows running down the centre of this main roof, the rafters above it will have an overhang, and under the window will be another set of rafters in place. The overhang of the above rafters and the bottom rafters will be supported by two Roof beams running length wise down the structure, and parallel to one another (pleas refer to sections 1.1-1.1.6). The other two roofs will be created with two sets of rafters each, and also a ridge beam. On top of these roofs, will be an alternation between insulation batts and roof battens, then placed above these will be the silver wrap insulation and finally the colour bond roofing. In order to get the curved shape of my roof, the roof battens will be ordered to alternating sizes such as to support the pre-fabricated, moulded colour bond. Page 6.
AESTHETIC DESIGN Through analysing the location of Glen Murcutt’s house in Kempsey of NSW, the area consisted of numerous trees and green grass. The farm like area prompted me to design something that would be similar to the surrounding nature, drawing particular inspiration from the trees. I also noted that multiple straight lines and symmetry existed within the structure. I began to take note of the overall shapes of the of the trees, getting rid of the leaves and focusing on the shape of the branches. It was my intention to create a roof that wouldn’t appear lopsided or out of place with the building itself or its surroundings. I wanted it to be a new roof but yet still blending with the landscape. Almost like a harmonising contrast, to the already existing structure and surrounds.
Design Process:
1.
2.
3.
4.
5.
Page 7.
FUNCTION
Due to the location of the Murcutt Guest Studio, I had a look at the climate for the area, and found that the roof needed to be able to withstand both extremities, in that, there was a lot of rain and most obviously, a lot of sun and heat. It was for this reason, that I designed a rood that would allow for a somewhat easy water flow when it rained (for the closed off sections at the bottom of the curves, a gutter will be put in place), a large window on the front and back faces of the roof (to allow for maximum lighting), and also the three smaller windows in between the two roof levels, that would open up, in order to help with the air circuit of the house. Page 8.
PHOTOS OF MODELS
N.B. Certain parts of the model are not to scale as the balsa would could not be cut to the required sized neatly.
Page 9.
DIAGRAMS, DETAILS & ANNOTATIONS
Throughout the course of this report (In particular the Member schedule and Appendix) names have been given to members of the roof structure. To assist in the distinguishing of members, these diagrams have been labelled with the numbers provided to each member.
Page 10.
SPANMAN CALCULATIONS
Diagrams of the roof with the measurements that was then entered into Spanman.
Page 11.
REFERENCES Alibaba.com 2013, Roof Battens, accessed at <http://www.alibaba.com/product-free/12254128/Roof_Battens_Laths_/ showimage.html> [Viewed 24 September 2013] Cantonfairtrading 2013, Aluminium Windows, accessed at <http://www.cantonfairtrading.com/product/AluminiumWindows_24503_JHHNJ.html> [Viewed 24 September 2013] Ching, F 2008, Building Construction Illustrated / Francis D.K. Ching, n.p.: Hoboken, N.J. : John Wiley & Sons, c2008. Habitusliving.com 2013, Designing Solutions, accessed at <http://www.habitusliving.com/desire/finishes/colorbond> [Viewed 23 September 2013] ICT International 2013, Smart Stem Psychrometers, accessed at <http://www.ictinternational.com.au/stempsychrometer.htm> [Viewed 24 September 2013] Insulation Australia 2013, Insulation Batts Melbourne, accessed at <http://www.insulationaustralia.com.au/insulation-battsmelbourne-2/> [Viewed 24 September 2013] Spanman PTY Ltd 2013, Spanman, accessed at <www.spanman.net> Tait, Timber & Hardware 2013, Structural Timber, accessed at <http://www.taittimber.com.au/taxonomy/term/4> [Viewed 24 September 2013]