Word list

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