STUDIO REPORT A tiled roof should be constructed at pitches greater than 15 degree. Medium and high slope roofs maybe covered with tiles or sheet materials. In fact, the roof slope affects the choice of roofing material. For example, low-slope roofs require roll membrane roofing, so shingles and sheet materials may be used.
Sloping roofs may have a structure of: Wood or steel rafters Timber or steel beams Steel trusses
High slope Medium slope Low slope
STUDIO REPORT Ridge beam Rafter spam
Ceiling joist beam
Eaves overhang
Both ends fixed one end fixed, One end free Effective length smaller
Effective length larger
Steel is a commonly used material in the construction industry because The site manager told us 1. It has good compressive and tensile properties these properties of steel. Also 2. It can be formed into many different products he said timber could be 3. But not easy cut and change shape on site further cut in site while steel could not.
WEEKLY LOOP
Points to note:
Metal Types->
Ferrous
Non-ferrous
Alloys
Properties Hardness
Varied depending on types
Fragility
low, generally will not shatter
Ductility
High because of their atomic composition
Flexibility
Medium to high, high plasticity while heated
Density
High, 3x density of water
Conductivity
Very good conductors of heat and electricity
Durability
Very durable depending on treatment
Sustainability
Very high embodied enerygy
Cost
Generally cost effective
As located nearby the sea, it is much more moist so the corrosion occurs easily.
Metals will react with other metals by giving or taking up another metal’s ions which could cause corroding. To reduce the chance of corrosion, metals have to be separated by insulator such as rubber or kept away from moisture.
WORD LIST 1.Rafter A rafter is one of a series of sloped structual beams that extend from the ridge designed to support the roof deck and its associated loads.
2. Purlin A purlin is any longitudinal, horizontal, structural member in a roof except a type of framing with what is called a crown plate.
3. Soffit In popular use, soffit most often refers to the material forming a ceiling from the top of an exterior house wall to the outer edge of the roof, i.e., bridging the gap between a home's siding and the roofline 1. rafter, 2014. Retrieved from http://en.wikipedia.org/wiki/rafter 2. Purlin, 2014. Retrieved from http://en.wikipedia.org/wiki/Purlin 3. Soffit,2014. Retrieved from http://en.wikipedia.org/wiki/Soffit