Timber And Concrete Construction Construction Essay

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My initial opinion in writing this assignment is that whereas, I am asked to evaluate the advantages disadvantages between timber and concrete construction, is that, as a student new to the Building industry, I find the term 'timber construction' to be quite misleading, in that it gives the impression of constructing a structure entirely from wood. I personally don't think that would be realistic given the natural environment and health and safety predominance we have in the UK.

I am of the opinion, that in 99% of cases, within in the United Kingdom, you cannot construct one without the other, certainly, if the structure is to become a home, office, warehouse or store and if you're working to a strict budget or deadline.

For example, in considering a British home, whether it is a grand Edwardian four storey property in Bath or a modest three bedroom semi in Swansea, both contain both concrete and timber within its construction.

Whereas the external walls and foundations are predominantly concrete, the internal construction such as roof rafters, staircases and door joists are primarily made with timber.

From a personal point of view, having owned both a timber frame house and now a solid masonry structure, I would encourage anyone to go for a masonry building as opposed to timber, due to the noise levels. My timber frame property was a semi detached and every time my adjoining neighbour went up his staircase, you could feel the vibration and sounds of his footsteps as he did so. Also things such as hanging mirrors or kitchen cabinets onto the dry skinned walls proved to be very difficult. Additionally, I found the rooms not only in my property, but those in other 'modern' homes I have visited be extremely small in space and lacking any real character or workmanship. Admittedly, my timber framed home was a far warmer property than the one I have now, and therefore my fuel bills were much lower, but from a comfort and quality point of view, I far prefer my 1940's built masonry home.

Modern methods of timber construction were introduced into the UK in the 1960's. Timber frame construction offers flexible planning

Energy efficient construction, economic use of materials and a range of finishes. Timber frame construction is lighter when compared to masonry construction and in many instances foundations can be made smaller and therefore reduce costs and wastage.

In the United Kingdom timber frame largely encompasses factory manufactured wall frames and roof trusses. Timber frame construction is based on timber members and components forming a structural frame which transmits all vertical and horizontal loads to the foundations. The external cladding is non load bearing and its main functions are to make the building weatherproof and offer an attractive external appearance

The high levels of thermal insulation make timber frame an attractive option. It is common to erect buildings to a height of two to three storeys.

The average house can be built 15% faster than using traditional methods, timber framing is less dependant on weather conditions, and the actual building shell can be made weatherproof quickly, this means that the tradesman that follows, can start his work far sooner. More so, on larger projects such as nursing homes or multiple dwelling projects it is also safe for following tradesmen (electrician, plumbers etc) to work on the lower levels, as the flooring above in effect, acts as a safety board. It is also a cleaner method of building as it produces less waste and is a far cleaner, healthier environment in which to work in.

It is a very sustainable method of domestic house construction and has become very common in properties that have to meet carbon emission regulations. Frames are made from processed softwoods or needle leave trees such as pine, which is readily available and farmed in many European countries.

Although much of the United Kingdoms hardwood stock is now depleted, and has to be sourced from countries such as Germany, High transportation and importation costs can be offset by a very efficient prefabrication assembly of complete wall, floor or roof units. Timber frame construction improves 'U' values without the need for wide wall construction yet still maintains a clear cavity. Much of the build elements will be derived from renewable sources.

Advantages of timber frame (building technology 5th edition i.h. seeley 30/11/12

The substantial interest in timber framed housing has occurred for many reasons, but principally because of the following:

Shell of the house, including roof, can be constructed in as little time as a day, allowing the other trades to work under cover.

The dry construction can be made under factory conditions thus reducing costs.

Full insulation values are achieved immediately upon completion, and not months later, as with conventional methods when

The building water has finally dried out

Dry shrinkage in the internal concrete block work is eliminated.

Site security is less problematic because of the speedy completion time.

Financial outlay for materials and components can be delayed due to quick factory production

Internal wall modifications are simplified and more flexible, and less expensive

Intermeeting heating can be adopted when the building is unoccupied, saving energy. Timber frame is more lightweight and well insulated and heats quicker than brickwork and block work

The outer brick face can be retained which is still fashionable in Great Britain.

Advantages:

Compared with an inner leaf of a cavity wall, timber is much lighter and easier to handle than masonry and will reduce foundation costs due to the lighter load upon it than typical masonry.

Has a high strength-to-weight ratio and can be very stiff.

Prefabricated units require no specialist carpentry skills on site, as units are just nailed together.

High thermal efficiency and reduced structural heat loss.

Dry lining can save both time and money

Running cables and pipe work can be run through

Very environmental friendly and sustainable method of construction.

Disadvantages

Poor fire resistance

Susceptible to damp and infestation due to its hydroscopic nature, although proper treatment of the wood and ventilation can reduce risk of such attack greatly.

Noise levels will be higher than a masonry construction.

Fitting of fixtures to dry lined walls can result in visual damage and will restrict owners of what can actually be shelved and supported on such walls.

College notes:

Quicker onsite time

Shorter programme

Execution of activities concurrently

Reduction in trades on site

Quicker return in investment

Manufactured in a factory controlled environment

Dimensionally accurate

Reduced waste & better waste management

Reduction in defects

Not weather dependant

Factory controlled quality assurance

Increased health & safety

Greater efficiency in the use of transport & resources

Sustainable method of construction

Energy efficient & environmentally friendly

Timber is recyclable

Has low embodied energy if constructed using local timber

Fast heating due to low thermal mass.

Low weight

Light weight construction requires less expensive foundations

Drying out time

Reduced drying out time thus internal finishes completed quicker

Flexibility of design

Extensions can easily be added & internal layouts can be readily adapted when required.

Typical timber frame wall:

Masonry outer skin

Insulation quilt waterproof breather membrane

Wal tie

Sheathing board

Vapour control layer plasterboard

Structural timber frame

In-situ concrete structures (good experts in red book in work cupboard)

Have three main componements, thus being: formwork and false work, reinforcement and concrete. Examples of types of insitu structures would be Multi storey buildings, bridges.

Advantages:

Amenable to almost any shape

Connections are homogenous with the rest of the structure

Can be designed with a large degree of resistance to natural disasters such as earthquakes and explosions.

Good consistency of uninterrupted work production in site, and high rate of work output, in that once the structure is brought to site; contractors normally have the necessary plant and expertise to quickly join pieces together.

Last minute alterations can be made

Design can proceed as the structure is being actively constructed and progressing into set stages.

Disadvantages:

Alterations can be difficult and expensive to rectify, particularly if there have been errors made during the formwork and false work stages of construction.

Implementing large forms of insitu concrete always require extensive labour and plant resources. Additionally, the preparation work prior to being in a position to actually introduce the insitu structure is always very labour extensive.

Construction is dependant on weather conditions, although that could also be argued that would be the case in most forms of outdoor building work.

Advantages:

Compared with an inner leaf of a cavity wall, timber is much lighter and easier to handle than masonary and will reduce foundation costs due to the lighter load upon it than typical masonary.

Has a high strength-to-weight ratio and can be very stiff.

Prefabricated units require no specialist carpentry skills on site,, as units are just nailed together.

High thermal efficiency and reduced structural heat loss.

Dry lining can save both time and money

Running cables and pipework can be run through

Very environmental friendly and sustainable method of construction.

Disadvantages

Poor fire resistance

Susceptible to damp and infestation due to its hydroscopic nature, although proper treatement of the wood and ventilation can reduce risk of such attack greatly.

Noise levels will be higher than a masonary construction.

Fitting of fixtures to dry lined walls can result in visual damage and will restrict owners of what can actually be shelved and supported on such walls.

College notes:

Quicker onsite time

Shortr programme

Execution of activities concurrently

Reduction in trades on site

Quicker return in investment

Manufactured in a factory controlled environment

Dimensionally accurate

Reduced waste & better waste management

Reduction in defects

Not weather depepndant

Factory controlled quality assurance

Increased health & safety

Greater efficiency in the use of transport & resources

Substainable method of construction

Energy efficient & environmentally friendly

Timber is recyclable

Has low embodied energy if constructed using local timber

Fast heating due to low thermal mass.

Low weight

Light weight construction requires less expensive foundations

Dryinmg out time

Reduced drying out time thus internal finishes completed quicker

Flexibility of design

Extensions can easily be added & internal layouts can be readily adapted when required.

Timber frame construction consists of prefabricated wooden wll panels, timber flooring, and roof materials built upon a timber framework.

The timber components are nailed to the framework to provide a sturdy skeltton around which the external walls of a conventional building are built.

Typical timber frame wall:

Smasonary outer skin

Insulation quilt waterproof breather membrane

Wal tie

Sheathing board

Vapour control layre plasterboard

Structural timber frame

Cullis…..'timber material of the past in terms of foundation.

Timber not used for foundations in the uk, unless in the short board systems and decorative, like decking, pub features etc

Timber frame is a method of construction as opposed to a system of a building, in the Uk timber frame largely encompasses factory manufactured wall frames and roof trusses.Timber frame construction is based on timber members and components forming a structural frame which transmits all vertical and horizontal loads to the foundations.The external cladding is non load bearing and its main functions are to make the building weatherproof and offer an attractive external appearance.

Advantages of timber frame (building technology 5th edition i.h. seeley 30/11/12

The substantial interest in timber framed housing has occurred for many reasons, but principally because of the following:

Shell of the house, including roof, can be constructed in as little time as a day, allowing the other trades to work under cover.

The dry construction can be made under factory conditions thus reducing costs.

Full insulation values are achieved immediately upon completion, and not months later, as with conventional methods when

The buildingwater has finally dried out

Dry shrinkage in the internal concrete blockwork is eleiminated.

Site security is less problematic because of the speedy completion time.

Financial outlay for materials and components can be delayed due to quick factory production

Internal wall modifications are simplified and more flexible, and less expensive

Intermeeting heating can be adopted when the building is unoccupied, saving energy. Timber frame is more lightweight and well insulated and heats quicker than brickwork and blockwork

The outer brick face can be retained which is still fashionable in Great Britain.

 

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